The poor interfacial adhesion of aramid fiber and matrix limits the application of the final composites. In this study, a series of the sulfone-functionalized poly(p-phenylene terephthalamide) (SPPTA) copolymers were satisfactorily synthesized and the effects of polymerization conditions (contents of the additional monomer and the cosolvent LiCl, molar concentration and ratio of the monomer, reaction temperature and time) on the molecular weight of the copolymer were discussed. The introduction of the sulfone group in aromatic polyamides not only increased the polarity of poly(p-phenylene terephthalamide) (PPTA) but destroyed the regular arrangement of the molecular chains, which greatly improved the surface free energy and the solubility of the polymers in organic solvents. The polymer maintained excellent thermal and interfacial properties. Compared with the PPTA fiber/epoxy composites, the interfacial shear strength (IFSS) of SPPTA fiber-reinforced epoxy composites reached 43.5 MPa, with a significantly enhancement of 20.8%, implying that the study provided an effective method to achieve highly interfacial adhesion of aramid fiber-reinforced composites.
PrasadVVTalupulaS. A review on reinforcement of basalt and aramid (Kevlar 129) fibers. Mater Today-Proc2018; 5: 5993–5998.
2.
ZavadskiiAEZakharovaIMZhukovaZN. Features of the fine structure of aramid fibres. Fibre Chem1998; 30: 6–10.
3.
ZhaoHFZhangMYZhangSF, et al.Influence of fiber characteristics and manufacturing process on the structure and properties of aramid paper. Polym-Plast Technol2012; 51: 134–139.
4.
GarcíaJMGarcíaFCSernaF, et al.High-performance aromatic polyamides. Prog Polym Sci2010; 35: 623–686.
5.
ElsabeeMZMorsiRESelimS. High-performance wholly aromatic polyamide-hydrazides: achievements and future prospects. High Perform Polym2018; 30: 387–405.
6.
AmranYHMAlyousefRRashidRSM, et al.Properties and applications of FRP in strengthening RC structures: a review. Structures2018; 16: 208–238.
7.
KonarzewskiVHCSpiekemannFLSantanaRMC. Natural ageing of polyaramide fiber from ballistic armor. Polímeros2019; 29: 1.
8.
AbtewMABoussuFBruniauxP, et al.Influences of fabric density on mechanical and moulding behaviours of 3D warp interlock para-aramid fabrics for soft body armour application. Compos Struct2018; 204: 402–418.
9.
ChengSWHanTHuangTY, et al.High-performance electrofluorochromic devices based on aromatic polyamides with AIE-active tetraphenylethene and electro-active triphenylamine moieties. Polym Chem2018; 9: 4364–4373.
10.
ChenTQiuJHZhuKJ, et al.Achieving high performance electric field induced strain: a rational design of hyperbranched aromatic polyamide functionalized graphene-polyurethane dielectric elastomer composites. J Phys Chem B2015; 119: 4521–4530.
11.
WangZXLiTYuJR, et al.Innovative pre-treatment for fabrication of conductive PMIA Fibers via electroless nickel plating. Adv Eng Mater2019; 21: 1801041.
12.
GorePMKandasubramanianB. Functionalized aramid fibers and composites for protective applications: a review. Ind Eng Chem Res2018; 57: 16537–16563.
13.
ZhouSLiCSFanXH, et al.Effect of hydrogen bonding on the liquid crystalline behavior of poly(p-phenylene terephthamide) in sulfuric acid. Polymer2018; 143: 316–323.
14.
MercerBZywiczEPapadopoulosP. Molecular dynamics modeling of PPTA crystallite mechanical properties in the presence of defects. Polymer2017; 14: 329–347.
15.
MogurampellySMacDermaidCMPercecS, et al.Aggregation of poly(p-phenylene terephthalamide) chains: emergence of fiber defects. Phys Rev Mater2019; 3: 015602.
16.
WangCXDuMLvJC, et al.Surface modification of aramid fiber by plasma induced vapor phase graft polymerization of acrylic acid. I. Influence of plasma conditions. Appl Surf Sci2015; 349: 333–342.
17.
JiaCXChenPLiuW, et al.Surface treatment of aramid fiber by air dielectric barrier discharge plasma at atmospheric pressure. Appl Surf Sci2011; 257: 4165–4170.
18.
ZilleAOliveiraFRSoutoAP. Plasma treatment in textile industry. Plasma Process Polym2015; 12: 98–131.
19.
SuMGuAJLiangGZ, et al.The effect of oxygen-plasma treatment on Kevlar fibers and the properties of Kevlar fibers/bismaleimide composites. Appl Surf Sci2011; 257: 3158–3167.
20.
KongHJSunHChaiJ, et al.Improvement of adhesion of Kevlar fabrics to epoxy by surface modification with acetic anhydride in supercritical carbon dioxide. Polym Compos2019; 40: 920–927.
21.
KanervaMKorkiakoskiSLahtonenK, et al.DLC-treated aramid-fibre composites: tailoring nanoscale-coating for macroscale performance. Compos Sci Technol2019; 171: 62–69.
22.
LeeJKimSSKangD, et al.Physicochemical characterization of polyimide (PI)/p-aramid: new functional and safe materials with improved heat resistance by a simple coating of polyimide on the surface of p-aramid. Prog Org Coat2019; 127: 117–123.
23.
ZhouLFYuanLGuanQB, et al.Building unique surface structure on aramid fibers through a green layer-by-layer self-assembly technique to develop new high performance fibers with greatly improved surface activity, thermal resistance, mechanical properties and UV resistance. Appl Surf Sci2017; 411: 34–45.
24.
LiTWangZXYuJR, et al.Cu (II) coordination modification of aramid fiber and effect on interfacial adhesion of composites. High Perform Polym2019; 31: 1054–1061.
25.
GuanFLAnFYangJ, et al.Fiber-reinforced three-dimensional graphene aerogels for electrically conductive epoxy composites with enhanced mechanical properties. Chinese J Polym Sci2017; 35: 1381–1390.
26.
DaiYMengCBChengZ, et al.Nondestructive modification of aramid fiber based on selective reaction of external cross-linker to improve interfacial shear strength and compressive strength. Compos Part A: Appl Sci2019; 119: 217–224.
27.
SaRYanYWangL, et al.Improved adhesion properties of poly-p-phenyleneterephthamide fibers with a rubber matrix via UV-initiated grafting modification. RSC Adv2015; 5: 94351–94360.
28.
GuanYZhengYJCuiJX, et al.Synthesis and characterization of graft copolymers based on poly(p-phenylene terephthalamide) backbone and well-defined polystyrene side chains. Chinese J Polym Sci2010; 28: 257–267.
29.
MatsudaHAsakuraTNakagawaY. Sequence analysis of Technora (copolyamide of terephthaloyl chloride, p-phenylenediamine, and 3,4’-diaminodiphenyl ether) using C-13 NMR. Macromolecules2003; 36: 6160–6165.
30.
WangWBQiXGuanY, et al.Synthesis and properties of poly(p-phenylene terephthalamide) bearing both polar and unsaturated substituents introduced via Claisen rearrangement reaction. J Polym Sci Pol Chem2016; 54: 2050–2059.
31.
LuoKJWangYYuJR, et al.Semi-bio-based aromatic polyamides from 2,5-furandicarboxylic acid: toward high-performance polymers from renewable resources. RSC Adv2016; 6: 87013–87020.
32.
LuoLBWangYZDaiY, et al.The introduction of asymmetric heterocyclic units into poly(p-phenylene terephthalamide) and its effect on microstructure, interactions and properties. J Mater Sci2018; 53: 13291–13303.
