Polymer blends acidic oligomers

Tsuneizumi et al. [13] studied the chemical recycling of poly(lactic acid)-based polymer blends using environmentally benign catalysts, clay catalysts, and enzymes. Poly(L-lactic acid) (PLLA)-based polymer blends (e.g., PLLA/polyethylene [PE] and PLLA/poly(butylenes succinate) [PBS]) were degraded into repolymerizable oligomer. 

Asymmetric PEMs with a loosely cross-linked proton conductive layer sandwiched between two primarily hydrophobic layers with limiting methanol swelling have been prepared. A three-component polymer blend (TCB) consisting of poly(4-vinylphenol-co-methacrylate) (PVPMA), poly(butyl methacrylate) (PBM), and acrylic copolymer resin Polaroid B-82 acted as a methanol barrier layer. The proton conductive hydrophilic layer consisted of a random copolymer of 2-hydroxy-2-acrylamido-2-methyl propanesulfonic acid (AMPS) and HEMA, loosely cross-Unked by poly(ethylene glycol) dimethacrylate (PEG-DMA) oligomer. TGA analysis showed that these membranes are thermally stable up to 270 °C. However, their proton conductivity was rather low [172]. Thermoplastic PVDF-SEBS blends compatibUized with MMA block copolymers can be used for solventless fabrication of PEMs [173]. 

Tg measurements have been performed on many other polymers and copolymers including phenol bark resins [71], PS [72-74], p-nitrobenzene substituted polymethacrylates [75], PC [76], polyimines [77], polyurethanes (PU) [78], Novolac resins [71], polyisoprene, polybutadiene, polychloroprene, nitrile rubber, ethylene-propylene-diene terpolymer and butyl rubber [79], bisphenol-A epoxy diacrylate-trimethylolpropane triacrylate [80], mono and dipolyphosphazenes [81], polyethylene glycol-polylactic acid entrapment polymers [82], polyether nitrile copolymers [83], polyacrylate-polyoxyethylene grafts [84], Novolak type thermosets [71], polyester carbonates [85], polyethylene naphthalene, 2,6, dicarboxylate [86], PET-polyethylene 2,6-naphthalone carboxylate blends [87], a-phenyl substituted aromatic-aliphatic polyamides [88], sodium acrylate-methyl methacrylate multiblock copolymers [89], telechelic sulfonate polyester ionomers [90], aromatic polyamides [91], polyimides [91], 4,4"-bis(4-oxyphenoxy)benzophenone diglycidyl ether - 3,4 epoxycyclohexyl methyl 3,4 epoxy cyclohexane carboxylate blends [92], PET [93], polyhydroxybutyrate [94], polyetherimides [95], macrocyclic aromatic disulfide oligomers [96], acrylics [97], PU urea elastomers [97], glass reinforced epoxy resin composites [98], PVOH [99], polymethyl methacrylate-N-phenyl maleimide, styrene copolymers [100], chiral... 

High-molecular/low-molecular composites such as blends of poly (benzimidazoles) with phosphoric acid as the proton-conducting component or phosphoric acid blended into other organopolymers [24-27], or blends of a sulfonated polymer with amphoterics such as imidazoles or pyrazoles or imidazole-containing oligomers or polymers alone [28,29], or blends of sulfonated polymers with heteropolyacids [30-32]. 

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