Evaluation of biodegradability of poly(epsilon-caprolactone)/poly(ethylene terephthalate) blends
Evaluation of biodegradability of poly(epsilon-caprolactone)/poly(ethylene terephthalate) blends
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DOI：
10.1007/bf02083881
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发表时间：
1996-01-01
期刊：
影响因子：
--
通讯作者：
Solaro, R
中科院分区：
文献类型：
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作者：
Chiellini, E;Corti, A;Solaro, R
报道了以聚对苯二甲酸乙二醇酯（PET）为主要组分的聚己内酯（PCL）共混物的生物降解性评价的研究结果。样品的共混物，作为熔融挤出的薄膜和/或粉末，提交降解测试在不同的环境条件下，包括全面堆肥，土壤掩埋，实验室规模的加速有氧降解，并暴露于无菌培养物和酯酶。已经获得的迹象表明，在熔体中的共混引起PCL链段在PET链中的插入。由此获得的共聚物充当大分子相容剂，允许PCL和PET的完全相容性。然而，在共混物样品上检测到的生物降解远低于相同环境条件下单个均聚物的化学组成和行为的预期值。PET/PCL共混物中作为主要组分的PET的存在明显降低了PCL被降解的倾向，至少在所研究的组合物范围内。在不同环境条件下收集的降解数据表明，全规模堆肥系统是最有效的测试降解程序。
The results of an investigation aimed at evaluation of the biodegradability of blends of poly(epsilon-caprolactone) (PCL) with poly(ethylene terephthalate) (PET) as the major component are reported. Specimens of the blends, as melt extruded films and/or powders, were submitted to degradation tests under different environmental conditions including full-scale composting, soil burial, bench-scale accelerated aerobic degradation, and exposure to axenic cultures and esterolytic enzymes. Indications have been gained that blending in the melt gives rise to insertion of PCL segments in the PET chain. Copolymers thus attained acted as macromolecular compatibilizers, allowing for a complete miscibility of PCL and PET. The biodegradation detected on the blend samples was, however, well below the values expected from chemical composition and behavior of individual homopolymers under the same environmental conditions. The presence of PET as the major component in PET/PCL blends apparently reduces the propensity of PCL to be degraded, at least in the investigated composition range. The degradation data collected under different environmental conditions indicate that the full-scale composting system is the most efficient among the tested degradation procedures.