In this study, crosslinked poly (butylene succinate) (PBS) was prepared successfully by the reactions of the end hydroxyl groups of PBS with the isocyanate groups of hexamethylene diisocyanate prepolymer (HDIP) using a vane extruder (VE) followed by compression moulding. Torque and gel permeation chromatography showed that the PBS was successfully corsslinked by HDIP. The effects of varied HDIP on properties such as mechanical, thermal properties, and capillary rheological behaviours were also evaluated. The results indicated that HDIP crosslinked PBS with high efficiency. The gel fraction of the crosslinked PBS increased to 57% with the 1.5wt-% HDIP loading. Differential scanning calorimetry revealed that the cross-link points in the crosslinked samples act as crystal nuclei and the crystallisation temperature increase. Dynamic mechanical analysis revealed that the glass transition temperature (Tg) increased with increase in gel fraction. This may be caused by the reduced molecular chain mobility for corsslinked samples. The capillary rheological properties showed that all samples exhibit non-Newtonian and shear thinning characteristics in the range of applied shear rates, and the apparent viscosity increased with the HDIP content. What's more, the crosslinked PBS also showed improved mechanical properties and thermal stability.
WangX. W., ZhangC. A., WangP. L., ZhaoJ., ZhangW., JiJ. H., HuaK., ZhouJ., YangX. B. and LiX. P.: ‘Enhanced performance of biodegradable poly(butylene succinate)/graphene oxide nanocomposites via in situ polymerization’, Langmuir, 2012, 28, 7091–7095, doi:10.1021/la204894hour.
2.
LuX., HuangJ., HeG., YangL., ZhangN., ZhaoY. and QuJ.: ‘Preparation and characterization of cross-linked poly(butylene succinate) by multifunctional toluene diisocyanate–trimethylolpropane polyurethane prepolymer’, Ind. Eng. Chem. Res., 2013, 52, 13677–13684, doi:10.1021/ie4020342.
3.
ZhangY., YuC., ChuP. K., LvF., ZhangC., JiJ., ZhangR. and WangH.: ‘Mechanical and thermal properties of basalt fiber reinforced poly(butylene succinate) composites’, Mater. Chem. Phys., 2012, 133, 845–849, doi:10.1016/j.matchemphys.2012.01.105.
4.
FengY. H., LiY. J., XuB. P., ZhangD. W., QuJ. P. and HeH.-Z.: ‘Effect of fiber morphology on rheological properties of plant fiber reinforced poly(butylene succinate) composites’, Compos. Part B Eng., 2013, 44, 193–199, doi:10.1016/j.compositesb.2012.05.051.
5.
LiJ. W., LuoX. G. and LinX. Y.: ‘Preparation and characterization of hollow glass microsphere reinforced poly(butylene succinate) composites’, Mat. Des., 2013, 46, 902–909, doi:10.1016/j.matdes.2012.11.054.
6.
WangX., YangH., SongL., HuY., XingW. and LuH.: ‘Morphology, mechanical and thermal properties of graphene-reinforced poly(butylene succinate) nanocomposites’, Compos. Sci. Technol., 2011, 72, 1–6, doi:10.1016/j.compscitech.2011.05.007.
7.
Chaoying WanB. C.: ‘Reinforcement of biodegradable poly(butylene succinate) with low loadings of graphene oxide ’, J. Appl. Polym. Sci., 2012, 127, 5094–5099, doi:10.1002/app.38136.
8.
YeH.-M., WangR.-D., LiuJ., XuJ. and GuoB.-H.: ‘Isomorphism in poly(butylene succinate-co-butylene fumarate) and its application as polymeric nucleating agent for poly(butylene succinate)’, Macromolecules, 2012, 45, 5667–5675, doi:10.1021/ma300685f.
9.
ZhouJ., WangX., HuaK., DuanC., ZhangW., JiJ. and YangX.: ‘Enhanced mechanical properties and degradability of poly(butylene succinate) and poly(lactic acid) blends’, Iran. Polym. J., 2013, 22, 267–275, doi:10.1007/s13726-013-0124-8.
RunM., WangJ., YaoM., GuoL., WangH.-j. and BaX.: ‘Influences of hyperbranched poly(amide-ester) on the properties of poly(butylene succinate)’, Mater. Chem. Phys., 2013, 139, 988–997, doi:10.1016/j.matchemphys.2013.02.068.
19.
ZhangK., MohantyA. K. and MisraM.: ‘Fully biodegradable and biorenewable ternary blends from polylactide, poly(3-hydroxybutyrate-co-hydroxyvalerate) and poly(butyle)’, ACS Appl. Mater. Interfaces, 2012, 4, 3091–3101, doi:10.1021/am3004522.
20.
OjijoV., RayS. S. and SadikuR.: ‘Role of specific interfacial area in controlling properties of immiscible blends of biodegradable polylactide and poly[(butylene succinate)-co-adipate]’, ACS Appl. Mater. Interfaces, 2012, 4, 6690–6701, doi:10.1021/am301842e.
21.
WangJ., ZhengL., LiC., ZhuW., ZhangD., GuanG. and XiaoY.: ‘Synthesis and properties of biodegradable poly(ester-co-carbonate) multiblock copolymers comprising of poly(butylene succinate) and poly(butylene carbonate) by chain extension’, Ind. Eng. Chem. Res., 2012, 51, 10785–10792, doi:10.1021/ie300547g.
22.
ShirahamaH., KawacuchiY., AludinM. S. and YasudaH.: ‘Synthesis and enzymatic degradation of high molecular weight aliphatic polyesters’, J. Appl. Polym. Sci., 2001, 80, 340–347. doi: 10.1002/1097-4628(20010418)80:3<340::AID-APP1105>3.0.CO;2-F
23.
ZhaoJ. B., LiK. Y. and YangW. T.: ‘Chain extension of polybutylene adipate and polybutylene succinate with adipoyl- and terephthaloyl-biscaprolactamate’, J. Appl. Polym. Sci., 2007, 106, 590–598, doi:10.1002/app.26635.
24.
LiuJ., LouL., YuW., LiaoR., LiR. and ZhouC.: ‘Long chain branching polylactide: structures and properties’, Polymer, 2010, 51, 5186–5197, doi:10.1016/j.polymer.2010.09.002.
25.
Es-haghiH., BouhendiH., Bagheri MarandiG., Zohurian-MehrM. J. and KabiriK.: ‘An investigation into novel multifunctional cross-linkers effect on microgel prepared by precipitation polymerization’, React. Funct. Polym., 2013, 73, 524–530, doi:10.1016/j.reactfunctpolym.2012.11.006.
26.
SzalokiM., GallJ., BukovinszkiK., BorbelyJ. and HegedusC.: ‘Synthesis and characterization of cross-linked polymeric nanoparticles and their composites for reinforcement of photocurable dental resin’, React. Funct. Polym., 2013, 73, 465–473, doi:10.1016/j.reactfunctpolym.2012.11.013.
27.
SuhartiniH. M. M., NagasawaN., YoshiiF. and KumeT.: ‘Radiation crosslinking of poly(butylene succinate) in the presence of low concentrations of trimethallyl isocyanurate and its properties’, J. Appl. Polym. Sci., 2003, 88, 2238–2246. doi: 10.1002/app.11944
28.
TeramotoN., OzekiM., FujiwaraI. and ShibataM.: ‘Crosslinking and biodegradation of poly(butylene succinate) prepolymers containing itaconic or maleic acid units in the main chain’, J. Appl. Polym. Sci., 2005, 95, 1473–1480, doi:10.1002/app.21393.
29.
HuangX., LiC., ZhuW., ZhangD., GuanG. and XiaoY.: ‘Ultraviolet-induced crosslinking of poly(butylene succinate) and its thermal property, dynamic mechanical property, and biodegradability’, Polym. Adv. Technol., 2011, 22, 648–656, doi:10.1002/pat.1560.
30.
KimD. J., KimW. S., LeeD. H., MinK. E., ParkL. S., KangI. K., JeonI. R. and SeoK. H.: ‘Modification of poly(butylene succinate) with peroxide: crosslinking, physical and thermal properties, and biodegradation’, J. Appl. Polym. Sci., 2001, 81, 1115–1124. doi: 10.1002/app.1534
31.
Kamarudin BahariH. M., EnjojiT., YoshiiF. and MakuuchiK.: ‘Radiation crosslinked poly(butylene succinate) foam and its biodegradation’, Polym. Degrad. Stab., 1998, 62, 551–557.
32.
TserkiV., MatzinosP., PavlidouE. and PanayiotouC.: ‘Biodegradable aliphatic polyesters. Part II. Synthesis and characterization of chain extended poly(butylene succinate-co-butylene adipate)’, Polym. Degrad. Stab., 2006, 91, 377–384, doi:10.1016/j.polymdegradstab.2005.04.036.
33.
EslamiH. and KamalM. R.: ‘Fully biodegradable and biorenewable ternary blends from polylactide, poly(3-hydroxybutyrate-co-hydroxyvalerate) and poly(butylene succinate) with balanced properties’, J. Appl. Polym. Sci., 2013, 4, 3091–3101, doi: 10.1002/APP.38449.
34.
WangG., GuoB. and LiR.: ‘Synthesis, characterization, and properties of long-chain branched poly(butylene succinate)’, J. Appl. Polym. Sci., 2012, 124, 1271–1280, doi:10.1002/app.34034.
35.
RogulskaM., KultysA. and Podkos´cielnyW.: ‘Studies on thermoplastic polyurethanes based on new diphenylethane-derivative diols. II. synthesis and characterization of segmented polyurethanes from HDI and MDI’, Eur. Polym. J., 2007, 43, 1402–1414, doi:10.1016/j.eurpolymj.2007.01.014.
36.
SaeedA. and ShabirG.: ‘Synthesis of thermally stable high gloss water dispersible polyurethane/polyacrylate resins’, Prog. Org. Coat., 2013, 76, 1135–1143, doi:10.1016/j.porgcoat.2013.03.009.
37.
ChattopadhyayD. K., SreedharB. and RajuK. V. S. N.: ‘Thermal stability of chemically crosslinked moisture-cured polyurethane coatings’, J. Appl. Polym. Sci., 2005, 95, 1509–1518, doi:10.1002/app.21404.
38.
RadislavB. J. C.PotyrailoA., MorrisW. G., CawseJ. N., FlanaganW. P., HassibL., MolaisonC. A., EzbianskyK., MedfordG. and ReitzH.: ‘Development of combinatorial chemistry methods for coatings: high-throughput adhesion evaluation and scale-up of combinatorial leads’, J. Comb. Chem., 2003, 5, 472–478. doi: 10.1021/cc030022s
39.
ChattopadhyayD. K. and RajuK. V. S. N.: ‘Structural engineering of polyurethane coatings for high performance applications’, Prog. Polym. Sci., 2007, 32, 352–418, doi:10.1016/j.progpolymsci.2006.05.003.
40.
S. Jia, J. Qu, R. Chen, C. Wu, Z. Huang, S. Zhai, W. Liu and Y. Feng: ‘Effects of thermoplastic polyurethane on the properties of poly(lactic acid)/organo-montmorillonite nanocomposites based on novel vane extruder’, Polym. Eng. Sci., 2013. n/a, doi:10.1002/pen.23781.
LiuS., ZhangY. and XuJ.: ‘Synthesis and characterization of polyureas from aniline trimer with TDI, MDI and HDI as pH sensitive materials’, Chin. J. Chem., 2011, 29, 1036–1040. doi: 10.1002/cjoc.201190176
43.
X. Lu, X. Wei, J. Huang, L. Yang, G. Zhang, G. He, M. Wang and J. Qu: ‘Super-toughened Poly (lactic-acid)/Polyurethane Blend Material by in-situ Reactive Interfacial Compatibilization via Dynamic Vulcanization‘, Ind. Eng. Chem. Res., 2014, 53, 17386–17393.
44.
TremblayP., LesageJ., OstiguyC. and TraH. V.: ‘Investigation of the competitive rate of derivatization of several secondary amines with phenylisocyanate (PHI), hexamethylene-1,6-diisocyanate (HDI), 4,4’-methylenebis(phenyl isocyanate) (MDI) and toluene diisocyanate (TDI) in liquid medium’, Analyst, 2003, 128, 142–149, doi:10.1039/b209779f.
45.
DuanH., ZhangL., WangJ., YangX. and WangX.: ‘Toughening modification of unsaturated polyester resin using HDI trimer’, J. Wuhan Univ. Technol.-Mater. Sci. Ed., 2009, 24, 627–630, doi:10.1007/s11595-009-4627-2.
46.
CaiD., YusohK. and SongM.: ‘The mechanical properties and morphology of a graphite oxide nanoplatelet/polyurethane composite’, Nanotechnology, 2009, 20, 085712, doi:10.1088/0957-4484/20/8/085712.
47.
MiyataT. and MasukoT.: ‘Crystallization behaviour of poly(tetramethylene succinate)’, Polymer, 1998, 39, 1399–1404. doi: 10.1016/S0032-3861(97)00418-7
48.
GanZ., AbeH., KurokawaH. and DoiY.: ‘Solid-State microstructures, thermal properties, and crystallization of biodegradable poly(butylene succinate) (PBS) and its copolyesters’, Biomacromolecules, 2001, 2, 605–613, doi:10.1021/bm015535e.
49.
YangL., ZhangH.-Y., YangQ. and LuD.-N.: ‘Bacterial cellulose-poly(vinyl alcohol) nanocomposite hydrogels prepared by chemical crosslinking’, J. Appl. Polym. Sci., 2012, 126, E245–E251, doi:10.1002/app.36854.
50.
XieX.-L., LiuQ.-X., LiR. K.-Y., ZhouX.-P., ZhangQ.-X., YuZ.-Z. and MaiY.-W.: ‘Rheological and mechanical properties of PVC/CaCO3 nanocomposites prepared by in situ polymerization’, Polymer, 2004, 45, 6665–6673, doi:10.1016/j.polymer.2004.07.045.
