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首页> 外文期刊>Journal of Applied Polymer Science >BIODEGRADABLE POLYMER BLENDS OF POLY(LACTIC ACID) AND POLY(ETHYLENE GLYCOL)
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BIODEGRADABLE POLYMER BLENDS OF POLY(LACTIC ACID) AND POLY(ETHYLENE GLYCOL)

机译：聚乳酸和聚乙二醇的生物可降解聚合物共混物

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Poly(lactic acid) (PLA) and poly( ethylene glycol) (PEG) were melt-blended and extruded into films in the PLA/PEG ratios of 100/0, 90/10, 70/30, 50/50, and 30/70. It was concluded from the differential scanning calorimetry and dynamic mechanical analysis results that PLA/PEG blends range from miscible to partially miscible, depending on the concentration. Below 50% PEG content the PEG plasticized the PLA, yielding higher elongations and lower modulus values. Above 50% PEG content the blend morphology was driven by the increasing crystallinity of PEG, resulting in an increase in modulus and a corresponding decrease in elongation at break. The tensile strength was found to decrease in a linear fashion with increasing PEG content. Results obtained from enzymatic degradation show that the weight loss for all of the blends was significantly greater than that for the pure PLA. When the PEG content was 30% or lower, weight loss was found to be primarily due to enzymatic degradation of the PLA. Above 30% PEG content, the weight loss was found to be mainly due to the dissolution of PEG. During hydrolytic degradation, for PLA/PEG blends up to 30% PEG, weight loss occurs as a combination of degradation of PLA and dissolution of PEG. (C) 1997 John Wiley & Sons, Inc. [References: 13]
机译：将聚乳酸（PLA）和聚乙二醇（PEG）熔融共混并以100 / 0、90 / 10、70 / 30、50 / 50和30的PLA / PEG比率挤出成膜/ 70。从差示扫描量热法和动态力学分析结果可以得出结论，PLA / PEG共混物的范围从可混溶到部分混溶，具体取决于浓度。低于50％的PEG含量，PEG使PLA增塑，产生更高的伸长率和更低的模量值。 PEG含量超过50％时，共混物形态受PEG结晶度增加的驱动，导致模量增加，断裂伸长率相应降低。发现抗张强度随着PEG含量的增加以线性方式降低。从酶促降解获得的结果表明，所有共混物的重量损失均显着大于纯PLA的重量损失。当PEG含量为30％或更低时，发现重量减轻主要是由于PLA的酶促降解。 PEG含量超过30％，发现重量损失主要是由于PEG的溶解。在水解降解过程中，对于最多含30％PEG的PLA / PEG共混物，重量损失是PLA降解和PEG溶解的综合作用。 （C）1997 John Wiley＆Sons，Inc. [参考：13]

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