THE BIODEGRADABILITY OF POLYESTER BLENDS
THE BIODEGRADABILITY OF POLYESTER BLENDS
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DOI：
10.1016/0142-9612(90)90124-9
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发表时间：
1990-03-01
期刊：
影响因子：
14
通讯作者：
PITT, CG
中科院分区：
文献类型：
--
作者：
CHA, Y;PITT, CG
聚（.epsilon）共混物。采用压模法、共沉淀法和溶剂蒸发法制备了聚乙醇酸-co- l -乳酸(PGLA) -己内酯（PCL）和聚l -乳酸（PLLA）聚合物乳液。通过对保存在pH为7.4、37度的磷酸盐缓冲液中样品的GPC痕迹进行反褶积来测定共混物中各组分的水解链断裂速率。C，长达3000小时。观察到的速率取决于混合的方法。压缩成型共混物中，PGLA的断链速率降低，PCL和PLLA的断链速率升高。还观察到体重减轻的相应延迟。没有混合混相的证据。
Blends of poly(.epsilon.-caprolactone) (PCL) and poly(L-lactic acid) (PLLA) with polyglycolic acid-co-L-lactic acid (PGLA) were prepared by three methods: compression moulding, coprecipitation, and solvent evaporation of a methylene chloride-in-water emulsion of the polymers. The rates of hydrolytic chain scission of each component of the blends were determined by deconvolution of GPC traces of samples maintained in phosphate buffer, pH 7.4, 37.degree. C, for up to 3000 h. The observed rates were dependent on the method of blending. For compression moulded blends, the rate of chain scission of PGLA was decreased and that of PCL and PLLA increased. A corresponding delay in the onset of weight loss was also observed. There was no evidence of blend miscibility.