Choi Jeongsoo, Kwak Seung-Yeop
Hyperstructured Organic Materials Research Center, and School of Materials Science and Engineering, Seoul National University, San 56-1, Shillim-dong, Gwanak-gu, Seoul 151-744, Korea.
Environ Sci Technol. 2007 May 15;41(10):3763-8. doi: 10.1021/es062715t.
Hyperbranched (dendritic) poly(epsilon-caprolactone)s (HPCLs) were synthesized to have architectural variations, which are the different lengths of linear segments and different numbers of branches, and were used as plasticizers for flexible poly(vinyl chloride) (PVC). The plasticization efficiency estimated by the lowering of glass transition temperature and the enhancement in ultimate elongation indicated that the HPCLs with the shorter linear segments and the larger number of branches imparted as high flexibility as di(ethylhexyl) phthalate (DEHP) and much higher flexibility than their linear analogue, linear poly(epsilon-caprolactone), which is one of currently used polymer plasticizers. Volatility, extractability, and exudation tests for PVC/HPCL samples showed that there was no plasticizer migration even at very harsh condition, while ca. 7-78% of additives in PVC/DEHP was migrated out of samples, indicating that the HPCL can be used as an alternative plasticizer to remove the potential health risk from migrating phthalates during end use.
合成了具有结构变化的超支化（树枝状）聚（ε-己内酯）（HPCL），即线性链段长度不同和支链数量不同的HPCL，并将其用作软质聚氯乙烯（PVC）的增塑剂。通过玻璃化转变温度的降低和极限伸长率的提高来估算的增塑效率表明，线性链段较短且支链数量较多的HPCL赋予了与邻苯二甲酸二（2-乙基己基）酯（DEHP）一样高的柔韧性，并且比其线性类似物线性聚（ε-己内酯）（目前使用的聚合物增塑剂之一）具有更高的柔韧性。对PVC/HPCL样品进行的挥发性、萃取性和渗出性测试表明，即使在非常苛刻的条件下也没有增塑剂迁移，而PVC/DEHP中约7-78%的添加剂会从样品中迁移出来，这表明HPCL可作为替代增塑剂，以消除最终使用过程中迁移邻苯二甲酸盐带来的潜在健康风险。
