Citric acid (CA) was used as a grafted group onto polyurethane (PU) to form a CA-grafted PU series, with a control PU series containing free CA prepared for comparison. With an increase in the CA content, the enthalpy change during the melting increased for the PU and CPU series, and the glass transition temperature increased with the increase in CA content for the PU series but not for the CPU series. The tensile strengths of the PU series sharply increased with the CA content, whereas those of the CPU series did not. The PU series demonstrated better low-temperature flexibility and water permeability than the unmodified PU.
VerhoffFHBauweleersH. Citric acid in ullmann’s encyclopedia of industrial chemistry. Weinheim: Wiley-VCH, 2014.
2.
LiLChengCXiangT. Modification of polyethersulfone hemodialysis membrane by blending citric acid grafted polyurethane and its anticoagulant activity. J. Membr Sci2012; 261: 405–406.
3.
ZhaoDZhaoLZhuC. Synthesis and properties of water-insoluble β-cyclodextrin polymer crosslinked by citric acid with peg-400 as modifier. Carbohyd Polym2009; 78: 125–130.
4.
PohCKLimSHPanH. Citric acid functionalized carbon materials for fuel cell applications. J Power Sources2008; 176: 70–75.
5.
MaoJWonSWVijayaraghavanK. Immobilized citric acid-treated bacterial biosorbents for the removal of cationic pollutants. Chem Eng J2010; 162: 662–668.
ChoiHSKimYSZhangY. Plasma-induced graft co-polymerization of acrylic acid onto the polyurethane surface. Surf Coat Technol2004; 182: 55–64.
8.
TsafackMJLevalois-GrützmacherJ. Towards multifunctional surfaces using the plasma-induced graft-polymerization (PIGP) process: flame and waterproof cotton textiles. Surf Coat Technol2007; 201: 5789–5795.
9.
LvQCaoCZhuH. Blood Compatibility of polyurethane immobilized with acrylic acid and plasma grafting sulfonic acid. J Mater Sci Mat Med2004; 15: 607–611.
10.
YangCPLinJH. Syntheses and properties of aromatic polyamides and polyimides derived from 9,9-Bis[4-(p-aminophenoxy)phenyl]fluorine. J Polym Sci Pol Chem1993; 31: 2153–2163.
11.
EastmondCPaprotnyJ. Synthesis of bulky bis(ether anhydride)s and poly(etherimide)s with bulky main-chain units. J Mater Chem1997; 7: 589–592.
12.
RohesonLM. Correlation of separation factor versus permeability for polymeric membranes. J Membr Sci1991; 62: 165–185.
13.
SongDJungKMoonJ. Photochemistry of chalcone and the application of chalcone-derivatives in photo-alignment layer of liquid crystal display. Opt Mater2003; 21: 667–671.
14.
LinJRChenLW. Study on shape-memory behavior of polyether-based polyurethanes. II. Influence of soft-segment molecular weight. J Appl Polym Sci1998; 69: 1575–1586.
15.
WangWPingPChenX. Polylactide-based polyurethane and its shape-memory behavior. Eur Polym J2006; 42: 1240–1249.
BagheriMPourmoazzenZ. Synthesis and properties of new liquid crystalline polyurethanes containing mesogenic side chain. React Funct Polym2008; 68: 507–518.
18.
Seyed MohagheghSMBarikaniMEntezamiAA. The effect of grafted poly(ethylene glycol monomethyl ether) on particle size and viscosity of aqueous polyurethane dispersions. Colloid Surf A2006; 276: 95–99.
19.
BuruianaECMelinteVBuruianaT. Synthesis and characterisation of new hard polyurethanes with triazene pendants. J Photochem Photobiol A Chem2005; 171: 261–267.
20.
Freij-LarssonCWesslenB. Grafting of polyurethane surfaces with poly(ethylene glycol). J Appl Polym Sci1993; 50: 345–352.
21.
ArchambaultJGJohnL. Protein resistant polyurethane surfaces by chemical grafting of PEO: amino-terminated PEO as grafting reagent. Colloid Surf B2004; 39: 9–16.
22.
TanKObendorfSK. Surface modification of microporous polyurethane membrane with poly(ethylene glycol) to develop a novel membrane. J. Membr Sci2006; 274: 150–158.
23.
AlvesPCoelhoJFJHaackJ. Surface modification and characterization of thermoplastic polyurethane. Eur Polym J2009; 45: 1412–1419.
24.
HuangJXuW. Zwitterionic monomer graft copolymerization onto polyurethane surface through a PEG spacer. Appl Surf Sci2010; 256: 3921–3927.
25.
ChungYCParkHSChoiJW. Characterization and low temperature test of the flexibly crosslinked polyurethane copolymer by poly(dimethylsiloxane). High Perform Polym2012; 24: 200–209.
26.
ChungYCJungIHChoiJW. Characterization and proof testing of the halochromic shape memory polyurethane. Polym Bull2014; 71: 1153–1171.
27.
ChoJWJungYCChunBC. Water vapor permeability and mechanical properties of fabrics coated with shape-memory polyurethane. J Appl Polym Sci2004; 92: 2812–2816.
28.
KemperSLFennemaO. Water vapor permeability of edible bilayer films. J Food Sci1984; 49: 1478–1481.
29.
PetrovicZSJavniIDivjakovicVJ. Structure and physical properties of segmented polyurethane elastomers containing chemical crosslinks in the hard segment. J Polym Sci Pol Phys1998; 36: 221–235.
30.
SekkarVGopalakrishnanSDeviKA. Studies on allophanate–urethane networks based on hydroxyl terminated polybutadiene: effect of isocyanate type on the network characteristics. Eur Polym J2003; 39: 1281–1290.
31.
SekkarVRama RaoMKrishinamurthyVN. Modeling of polyurethane networks based on hydroxy-terminated polybutadiene and poly(12-hydroxy stearic acid–co–tmp) ester polyol: correlation of network parameters with mechanical properties. J Appl Polym Sci1996; 62: 2317–2327.
32.
SuZLiQLiuY. Compatibility and phase structure of binary blends of poly(lactic acid) and glycidyl methacrylate grafted poly(ethylene octane). Eur Polym J2009; 45: 2428–2433.
33.
ChungYCNguyenDKChunBC. Lateral flexible linking of polyurethane copolymer and the effect on shape recovery and tensile mechanical properties. Polym Eng Sci2010; 50: 2457–2466.
ZhuohongYJinlianHYeqiuL. The study of crosslinked shape memory polyurethanes. Mater Chem Phys2006; 98: 368–372.
36.
ChungYCChungHMChoiJW. The sustainable shape recovery of polyurethane copolymer grafted with pendant anthryl group under extremely low temperature conditions. High Perform Polym2012; 24: 295–304.
