The micro foaming performance, moisture resistance and dynamic viscosity of scCO2-aid glutaraldehyde/hexametaphosphate/thermoplastic tapioca starch (GA/SHMP/TOS) foams were considerably improved by proper NaOH treatment. The expansion ratio, resilience rate, dynamic viscosity values of these NaOH modified foams improved to a maximum, as the time for NaOH treatment approached a proper value. The dynamic viscosity, expansion ratio and resilience rate of the scCO2-aid GA/SHMP/TOS foams modified using 110 atm scCO2-pressure, the proper alkali treatment time, SHMP loading and varying montmorillonite (MMT) loadings improved further, as their MMT loadings approached a proper value of 2.5 part per hundred parts of tapioca starch (PHTOS). Relatively large dynamic viscosity (7.1x104 Pa·s), extremely large expansion ratio (∼75), cell density (1.1x109 cells/cm3) and/or resilience rate (∼80%) were acquired for the scCO2-aid GA/SHMP/TOS/MMT foam modified using the proper alkali treatment time and MMT loading. Thermal analyses results showed that crystallization onset temperatures and crystallization rates of scCO2-aid GA/SHMP/TOS/MMT foams modified using the proper alkali treatment time and varying MMT loadings improved to a highest value by adding 2.5 PHTOS of MMT nano-platelets. Possible reasons accounting for the considerably improved micro foaming performance of scCO2-aid GA/SHMP/TOS/MMT foams modified using the proper alkali treatment time and MMT loading are proposed in this study.
MartienVDOMolenveldK. Replacing fossil based plastic performance products by bio-based plastic products-technical feasibility. New Biotechnol2016; 37: 48–59.
2.
LandriganPJStegemanJJFlemingLE, et al.Human health and ocean pollution. Ann Global Health2020; 86(1): 151–164.
3.
RyuHWKimDHJaeJ, et al.Recent advances in catalytic co-pyrolysis of biomass and plastic waste for the production of petroleum-like hydrocarbons. Bioresour Technology2020; 310: 123473.
4.
TurnerAHolmesL. Occurrence, distribution and characteristics of beached plastic production pellets on the island of Malta (central Mediterranean). Mar Pollut Bull2011; 62(2): 377–381.
5.
LucasDPettySMKeenO, et al.Methods of responsibly managing end-of-life foams and plastics containing flame retardants: part II. Environ Eng Sci2018; 35(6): 588–602.
6.
Van FranekerJALawKL. Seabirds, gyres and global trends in plastic pollution. Environ Pollut2015; 203: 89–96.
7.
BergmannMTekmanMBGutowL. Sea change for plastic pollution. Nature2017; 544(7650): 297.
8.
AmassWAmassATigheB. A review of biodegradable polymers: uses, current developments in the synthesis and characterization of biodegradable polyesters, blends of biodegradable polymers and recent advances in biodegradation studies. Polym Int2015; 47(2): 89–144.
LoHKadiyalaSGugginoSE, et al.Poly(L-lactic acid) foams with cell seeding and controlled-release capacity. J Biomedical Materials Research2015; 30(4): 475–484.
11.
WangJRenQZhengW, et al.Improved flame-retardant properties of poly(lactic acid) foams using starch as a natural charring agent. Ind Eng Chem Res2014; 53(4): 1422–1430.
12.
WangJZhuWZhangH, et al.Continuous processing of low-density, microcellular poly(lactic acid) foams with controlled cell morphology and crystallinity. Chem Eng Sci2012; 75: 390–399.
13.
KeshtkarMNofarMParkCB, et al.Extruded PLA/clay nanocomposite foams blown with supercritical CO2. Polymer2014; 55: 4077–4090.
14.
ZimmermannMVGBrambillaVCBrandaliseRN, et al.Observations of the effects of different chemical blowing agents on the degradation of poly(lactic acid) foams in simulated soil. Mater Res2013; 16(6): 1266–1273.
15.
QiFWangLZhangY, et al.Robust Ti3C2Tx MXene/starch derived carbon foam composites for superior EMI shielding and thermal insulation. Mater Today Phys2021; 21: 100512.
16.
EngelJBAmbrosiATessaroIC. Development of biodegradable starch-based foams incorporated with grape stalks for food packaging. Carbohydr Polym2019; 225: 115234.
17.
SaeidlouSHuneaultMALiH, et al.Poly(lactic acid) crystallization. Prog Polym Sci2012; 37(12): 1657–1677.
PicardEEspucheEFulchironR. Effect of an organo-modified montmorillonite on PLA crystallization and gas barrier properties. Appl Clay Sci2011; 53(1): 58–65.
20.
YehJ-TWuC-JTsouC-H, et al.Study on the crystallization, miscibility, morphology, properties of poly(lactic acid)/poly(ε-caprolactone) blends. Polymer-Plastics Techn Eng2009; 48: 571–578.
21.
KamalMRKhoshkavaV. Effect of cellulose nanocrystals (CNC) on rheological and mechanical properties and crystallization behavior of PLA/CNC nanocomposites. Carbohydr Polym2015; 123: 105–114.
22.
GuiZ-yWangH-rGaoY, et al.Morphology and melt rheology of biodegradable poly(lactic acid)/poly(butylene succinate adipate) blends: effect of blend compositions. Iranian Polym J2012; 21(2): 81–89.
23.
SungsanitKKaoNBhattacharyaS, et al.Physical and rheological properties of plasticized linear and branched PLA. Korea-aust Rheol J2010; 22: 187–195.
24.
MonikaMNMulchandaniNKatiyarV. Generalized kinetics for thermal degradation and melt rheology for poly (lactic acid)/poly (butylene succinate)/functionalized chitosan based reactive nanobiocomposite. Int J Biol Macromolecules2019; 141: 831–842.
25.
LeeREGuoYTamberH, et al.Thermoforming of polylactic acid foam sheets: crystallization behaviors and thermal stability. Ind Eng Chem Res2016; 55(3): 560–567.
26.
WangXKumarVLiW. Development of crystallization in PLA during solid-state foaming process using sub-critical CO2. Cell Polym2012; 31(1): 1–18.
27.
KohlhoffDOhshimaM. Open cell microcellular foams of polylactic acid (PLA)-based blends with semi-interpenetrating polymer networks. Macromolecular Mater Eng2011; 296(8): 770–777.
28.
DrrDStandauTCastellónSM, et al.Rheology in the presence of carbon dioxide (CO2) to study the melt behavior of chemically modified polylactide (PLA). Polymers2020; 12(5): 1108.
29.
ZhouMZhouPXiongP, et al.Crystallization, rheology and foam morphology of branched PLA prepared by novel type of chain extender. Macromolecular Res2015; 23(3): 231–236.
30.
GerardTBudtovaT. Morphology and molten-state rheology of polylactide and polyhydroxyalkanoate blends. Eur Polym J2012; 48(6): 1110–1117.
31.
TiwaryPParkCBKontopoulouM. Transition from microcellular to nanocellular PLA foams by controlling viscosity, branching and crystallization. Eur Polym J2017; 91: 283–296.
32.
ChauvetMSauceauMBaillonF, et al.Mastering the structure of PLA foams made with extrusion assisted by supercritical CO2. J Appl Polym Sci2017; 134(28): 45067.
33.
ChauvetMSauceauMBaillonF, et al.Blending and foaming thermoplastic starch with poly (lactic acid) by CO2-aided hot melt extrusion. J Appl Polym Sci2020; 138(14): 1–12.
34.
ZhangJ-FSunX. Biodegradable foams of poly(lactic acid)/starch I Extrusion condition and cellular size distribution. J Appl Polym Sci2007; 106(2): 857–862.
35.
GanjyalGMWeberRHannaMA. Laboratory composting of extruded starch acetate and poly lactic acid blended foams. Bioresour Techn2007; 98(16): 3176–3179.
36.
ChanvrierHChaunierLDella ValleG, et al.Flow and foam properties of extruded maize flour and its biopolymer blends expanded by microwave. Food Res Int2015; 76: 567–575.
37.
Lopez-GilASilva-BellucciFVelascoD, et al.Cellular structure and mechanical properties of starch-based foamed blocks reinforced with natural fibers and produced by microwave heating. Ind Crops Prod2015; 66: 194–205.
38.
CinelliPChielliniELawtonJW, et al.Foamed articles based on potato starch, corn fibers and poly(vinyl alcohol). Polym Degrad Stab2006; 91(5): 1147–1155.
39.
SalgadoPRSchmidtVCMolina OrtizSE, et al.Biodegradable foams based on cassava starch, sunflower proteins and cellulose fibers obtained by a baking process. J Food Eng2008; 85(3): 435–443.
40.
Vargas-TorresAPalma-RodriguezHMBerriosJ, et al.Biodegradable baked foam made with chayotextle starch mixed with plantain flour and wood fiber. J Appl Polym Sci2017; 134: 45565.
41.
UsluM-KPolatS. Effects of glyoxal cross-linking on baked starch foam. Carbohydr Polym2012; 87(3): 1994–1999.
42.
PornsuksomboonKHollóBBSzécsényiKM, et al.Properties of baked foams from citric acid modified cassava starch and native cassava starch blends. Carbohydr Polym2016; 136: 107–112.
43.
VercelhezeAESFakhouriFMDall’AntôniaLH, et al.Properties of baked foams based on cassava starch, sugarcane bagasse fibers and montmorillonite. Carbohydr Polym2012; 87(2): 1302–1310.
44.
İLknurGFerhundeU. Effect of glutaraldehyde crosslinking on degree of substitution, thermal, structural, and physicochemical properties of corn starch. Starch-Starke2018; 71: 1800046.
45.
El-TahlawyKVendittiRPawlakJ. Effect of alkyl ketene dimer reacted starch on the properties of starch microcellular foam using a solvent exchange technique. Carbohydr Polym2008; 73(1): 133–142.
46.
PatelSVendittiRAPawlakJJ, et al.Development of cross-linked starch microcellular foam by solvent exchange and reactive supercritical fluid extrusion. J Appl Polym Sci2009; 111(6): 2917–2929.
47.
KenarJAEllerFJFelkerFC, et al.Starch aerogel beads obtained from inclusion complexes prepared from high amylose starch and sodium palmitate. Green Chem2014; 16: 1921–1930.
48.
RobitzerMTourretteAHorgaR, et al.Nitrogen sorption as a tool for the characterisation of polysaccharide aerogels. Carbohydr Polym2011; 85: 44–53.
49.
GoimilLBragaMEMDiasAMA, et al.Supercritical processing of starch aerogels and aerogel-loaded poly(ε-caprolactone) scaffolds for sustained release of ketoprofen for bone regeneration. J CO2 Utilization2017; 18: 237–249.
50.
SalamAPawlakJJVendittiRA, et al.Synthesis and characterization of starch citrate−chitosan foam with superior water and saline absorbance properties. Biomacromolecules2010; 11: 1453–1459.
51.
IvanovicJMilovanovicSZizovicI. Utilization of supercritical CO2as a processing aid in setting functionality of starch-based materials. Starch - Stärke2016; 68: 821–833.
52.
SalernoAClericiUDomingoC. Solid-state foaming of biodegradable polyesters by means of supercritical CO2/ethyl lactate mixtures: Towards designing advanced materials by means of sustainable processes. Eur Polym J2014; 51: 1–11.
53.
ZhangWChenBZhaoH, et al.Processing and characterization of supercritical CO2batch foamed poly(lactic acid)/poly(ethylene glycol) scaffold for tissue engineering application. J Appl Polym Sci2013; 130: 3066–3073.
54.
CorreY-MMaazouzADuchetJ, et al.Batch foaming of chain extended PLA with supercritical CO2: influence of the rheological properties and the process parameters on the cellular structure. J Supercrit Fluids2011; 58: 177–188.
55.
KuoC-CLiuL-CLiangW-C, et al.Preparation of polylactic acid (PLA) foams with supercritical carbon dioxide and their applications for reflectors of white light-emitting diode (LED) lamps. Mater Res Bull2015; 67: 170–175.
56.
ChoKYRizviSSH. The time-delayed expansion profile of supercritical fluid extrudates. Food Res Int2008; 41: 31–42.
57.
AyoubARizviS. Reactive supercritical fluid extrusion for development of moisture resistant starch-based foams. J Appll Polym Sci2015; 120(4): 2242–2250.
58.
AlaviS.RizviS. S. H.Strategies for enhancing expansion in starch-based microcellular foams produced by supercritical fluid extrusion. Int J Food Properties2005; 8: 23–34.
59.
ParamanIWagnerMERizviSSH. Micronutrient and protein-fortified whole grain puffed rice made by supercritical fluid extrusion. J Agric Food Chem2012; 60: 11188–11194.
60.
ManoiKRizviSSH. Physicochemical characteristics of phosphorylated cross-linked starch produced by reactive supercritical fluid extrusion. Carbohyd Polym2012; 81: 687–694.
61.
RuttarattanamongkolKWagnerMERizviSSH. Properties of yeast free bread produced by supercritical fluid extrusion (SCFX) and vacuum baking. Innovative Food Sci Emerging Tech2011; 12: 542–550.
62.
PengJ-lPengX-lRuntJ, et al.Thermoplastic starch and glutaraldehyde modified thermoplastic starch foams prepared using supercritical carbon dioxide fluid as a blowing agent. Polym Adv Tech2018; 29: 2643–2654.
63.
JiaYBaiSParkCB, et al.Effect of boric acid on the foaming properties and cell structure of poly(vinyl alcohol) foam prepared by supercritical-CO2 thermoplastic extrusion foaming. Ind Eng Chem Res2017; 56: 6655–6663.
64.
WangLIshiharaSHikimaY, et al.Unprecedented development of ultrahigh expansion injection-molded polypropylene foams by introducing hydrophobic-modified cellulose nanofibers. ACS Appl Mater Inter2017; 9: 9250–9254.
65.
ZhaiWParkCBKontopoulouM. Nanosilica addition dramatically improves the cell morphology and expansion ratio of polypropylene heterophasic copolymer foams blown in continuous extrusion. Ind Eng Chem Res2011; 50: 7282–7289.
66.
ChengX-HWangKChengN-Q, et al.The control of expansion ratios and cellular structure of supercritical CO2-aid thermoplastic starch foams using crosslinking agents and nano-silica particles. J Polym Res2021; 28: 303–316.
67.
CaiJYangYManJ, et al.Structural and functional properties of alkali-treated high-amylose rice starch. Food Chem2014; 145: 245–253.
68.
Doki´cLDapˇcevi´cTKrstonoši´cV, et al.Rheological characterization of corn starch isolated by alkali method. Food Hydrocoll2010; 24: 172–177.
69.
WangYMengYJiZ, et al.Bioinspired colored degradable starch-based films with excellent tensile strength. Ind Crops Prod2021; 167: 113525.
70.
ChenFXieFLiuP, et al.Structure, thermal stability and suspension rheological properties of alcohol-alkali-treated waxy rice starch. Int J Biol Macromolecules2019; 134: 397–404.
71.
WangSCopelandL. Effect of alkali treatment on structure and function of pea starch granules. Food Chem2012; 135: 1635–1642.
72.
IsrakarnKNa NakornpanomNHongsprabhasP. Physicochemical properties of starches and proteins in alkali-treated mungbean and cassava starch granules. Carbohydr Polym2014; 105: 34–40.
73.
RenYXiaoWRongL, et al.The role of alkali in sweet potato starch-Mesona chinensis Benth polysaccharide gels: gelation, rheological and structural properties. Int Journal Biological Macromolecules2021; 170: 366–374.
74.
Nor NadihaMZFazilahABhatR, et al.Comparative susceptibilities of sago, potato and corn starches to alkali treatment. Food Chem2010; 121(4): 1053–1059.
75.
MasinaNChoonaraYEKumarP. A review of the chemical modification techniques of starch. Carbohyd Polym2016; 57(7): 281–290.
76.
QinYZhangHDaiY, et al.Effect of alkali treatment on structure and properties of high amylose corn starch film. Materials (Basel, Switzerland)2019; 12(10): 560–570.
77.
AzeredoHMCd. Nanocomposites for food packaging applications. Food Res Int2009; 42(9): 1240–1253.
78.
ChandraAGongSYuanM, et al.Microstructure and crystallography in microcellular injection-molded polyamide-6 nanocomposite and neat resin. Polym Eng Sci2005; 45: 52–61.
79.
DiYIannaceSMaioED, et al.Poly(lactic acid)/organoclay nanocomposites: thermal, rheological properties and foam processing. J Polym Sci B: Polym Phys2005; 43: 689–698.
KaewtatipKTanrattanakulVPhetratW. Preparation and characterization of kaolin/starch foam. Appl Clay Sci2013; 80-81: 413–416.
82.
ZhaiWYuJWuL, et al.Heterogeneous nucleation uniformizing cell size distribution in microcellular nanocomposites foams. Polymer2006; 47: 7580–7589.
83.
ChenLOzisikRSchadlerLS. The influence of carbon nanotube aspect ratio on the foam morphology of MWNT/PMMA nanocomposite foams. Polymer2010; 51: 2368–2375.
84.
ZengCHossienyNZhangC, et al.Synthesis and processing of PMMA carbon nanotube nanocomposite foams. Polymer2010; 51: 655–664.
85.
MartínezABRealinhoVAntunesM, et al.Microcellular foaming of layered double hydroxide−polymer nanocomposites. Ind Eng Chem Res2011; 50: 5239–5247.
CaoXJames LeeLWidyaT, et al.Polyurethane/clay nanocomposites foams: processing, structure and properties. Polymer2005; 46: 775–783.
88.
HanXZengCLeeLJ, et al.Extrusion of polystyrene nanocomposite foams with supercritical CO2. Polym Eng Sci2003; 43: 1261–1275.
89.
WangLSánchez-SotoMAbtT, et al.Microwave-crosslinked bio-based starch/clay aerogels. Polym Int2016; 65(8): 899–904.
90.
VercelhezeAESOliveiraALMRezendeMI, et al.Physical Properties, photo- and bio-degradation of baked foams based on cassava starch, sugarcane bagasse fibers and montmorillonite. J Polym Environ2013; 21(1): 266–274.
91.
Sinha RaySOkamotoM. New polylactide/layered silicate nanocomposites, 6. Macromolecular Mater Eng2003; 288: 936–944.
92.
RealinhoVAntunesMMartinezAB, et al.Influence of nanoclay concentration on the CO2 diffusion and physical properties of PMMA montmorillonite microcellular foams. Ind Eng Chem Res2011; 50: 13819−13824.
93.
MatsudaDKMVercehezeAESCarvalhoGM, et al.Baked foams of cassava starch and organically modified nanoclays. Ind Crops Prod2013; 44: 705–711.
94.
Romero-BastidaCATapia-BlácidoDRMéndez-MontealvoG, et al.Effect of amylose content and nanoclay incorporation order in physicochemical properties of starch/montmorillonite composites. Carbohydr Polym2016; 152: 351–360.
95.
HuangMYuJ. Structure and properties of thermoplastic corn starch/montmorillonite biodegradable composites. J Appl Polym Sci2010; 99(1): 170–176.
96.
KumarVSuhNP. A process for making microcellular thermoplastic parts. Polym Eng Sci1990; 30: 1323–1329.
