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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and chain extension of poly(L-lactic acid-co-succinic acid-co-1.4-butene diol)
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Synthesis and chain extension of poly(L-lactic acid-co-succinic acid-co-1.4-butene diol)

机译：聚（L-乳酸-琥珀酸-1.4-丁烯二醇）的合成和扩链

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L-Lactic acid (LA) was copolymerized with succinic acid (SA) and 1,4-butenediol (1,4-BED) in bulk state with titanium(IV) butoxide as a catalyst to produce poly(LA-co-SA-co-1,4-BED) (PLASBED). Poly(L-lactic acid) (PLLA) homopolymer obtained from a direct condensation polymerization of LA had weight average molecular weight (M-w) less than 4.1 X 10(4) and was too brittle to prepare specimens for the tensile test. Addition of SA and 1,4-BED to LA produced PLASB with M-w as high as 1.4 X 10(5) and exhibited tensile properties comparable to a commercially available high-molecular-weight PLLA. Chain extension by intermolecular linking reaction through the unsaturated 1,4-BED units in PLASBED with benzoyl peroxide further increased the molecular weight and made PLASBED more ductile and flexible to show elongation at break as high as 450%. Biodegradability of PLASBED measured by the modified Sturm test was nearly independent of the 1,4-BED content. Gel formation during the chain extension did not exert any significant influence on the biodegradability either. (C) 2005 Wiley Periodicals, Inc.
机译：将L-乳酸（LA）与琥珀酸（SA）和1,4-丁烯二醇（1,4-BED）本体化，并用丁醇钛（IV）作为催化剂生产聚（LA-co-SA- co-1,4-BED）（PLASBED）。由LA直接缩聚获得的聚（L-乳酸）（PLLA）均聚物的重均分子量（M-w）小于4.1 X 10（4），并且太脆而不能制备用于拉伸试验的样品。将SA和1,4-BED添加到LA中可制得M-w高达1.4 X 10（5）的PLASB，并具有可与市售高分子量PLLA媲美的拉伸性能。通过具有过氧化苯甲酰的PLASBED中的不饱和1，4-BED单元的分子间连接反应进行的链扩展进一步增加了分子量，并使PLASBED更具延展性和柔韧性，显示出高达450％的断裂伸长率。通过改良的Sturm试验测得的PLASBED的生物降解能力几乎与1,4-BED含量无关。扩链过程中的凝胶形成对生物降解性也没有任何显着影响。 （C）2005 Wiley期刊公司

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