Department of Materials Science and Engineering, Seoul National University , 599 Gwanak-ro, Gwanak-gu, Seoul, 151-744, Korea.
ACS Appl Mater Interfaces. 2014 Jul 23;6(14):11118-28. doi: 10.1021/am500740v. Epub 2014 Jul 1.
We develop a nontoxic unentangled star-shape poly(ε-caprolactone) (UESPCL) plasticizer with excellent migration resistance for the production of phthalate-free flexible poly(vinyl chloride) (PVC) by means of the ring-opening polymerization of ε-caprolactone, initiated from the multifunctional core, combined with end-capping, and vacuum purification processes. UESPCL is a transparent liquid at room temperature and exhibits unentangled Newtonian behavior because of its extremely short branched segments. UESPCL is biologically safe without producing an acute toxicity response. Torque analysis measurements reveals that UESPCL offers a faster fusion rate and a higher miscibility with PVC compared to a typical plasticizer, di(2-ethylhexyl) phthalate (DEHP). The solid-state (1)H nuclear magnetic resonance (NMR) spectrum reveals that PVC and UESPCL are miscible with an average domain size of less than 8 nm. The flexibility and transparency of the PVC/UESPCL mixture, that is, phthalate-free flexible PVC, are comparable to the corresponding properties of the PVC/DEHP mixture, and the stretchability and fracture toughness of PVC/UESPCL are superior to the corresponding properties of the PVC/DEHP system. Most of all, PVC/UESPCL shows excellent migration resistance with a weight loss of less than 0.6% in a liquid phase, whereas DEHP migrated out of PVC/DEHP into a liquid phase with a weight loss of about 10%.
我们开发了一种无毒的无缠结星形聚（ε-己内酯）（UESPCL）增塑剂，具有出色的迁移阻力，可通过 ε-己内酯的开环聚合来生产无邻苯二甲酸酯的柔性聚氯乙烯（PVC），该聚合由多功能核心引发，结合封端和真空净化工艺。UESPCL 在室温下为透明液体，由于其极短的支化段，表现出无缠结的牛顿行为。UESPCL 是生物安全的，不会产生急性毒性反应。扭矩分析测量表明，与典型的增塑剂邻苯二甲酸二（2-乙基己基）酯（DEHP）相比，UESPCL 提供了更快的融合速率和更高的 PVC 相容性。固态（1）H 核磁共振（NMR）谱表明，PVC 和 UESPCL 是可混溶的，平均畴尺寸小于 8nm。PVC/UESPCL 混合物的柔韧性和透明度，即无邻苯二甲酸酯的柔性 PVC，与 PVC/DEHP 混合物的相应性能相当，而 PVC/UESPCL 的拉伸性和断裂韧性优于 PVC/DEHP 体系的相应性能。最重要的是，PVC/UESPCL 表现出优异的迁移阻力，在液相中的失重率小于 0.6%，而 DEHP 从 PVC/DEHP 迁移到液相中的失重率约为 10%。
