Super-toughened poly(l-lactic acid) fabricated via reactive blending and interfacial compatibilization
详细信息 查看全文
- 作者：Meng Ma ; Haiming Zheng ; Si Chen ; Bozhen Wu ; Huiwen He ; Liqing Chen and Xu Wang
- 刊名：Polymer International
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：65
- 期：10
- 页码：1187-1194
- 全文大小：1501K
- ISSN：1097-0126
文摘
Super-toughened poly(l-lactic acid) (PLLA) was prepared by reactive blending of PLLA with poly(ϵ-caprolactone) (PCL), glycerol and 4,4′-methylenediphenyl diisocyanate. The reactive interfacial compatibility between PLLA and the formed crosslinked polyurethane (CPU) in the PLLA matrix was studied in detail. The morphology and the toughness of the blends can be tuned by changing the CPU content. The results indicate that the impact strength of PLLA shows a tendency to higher values with the increasing PCL content up to 20 wt%. The notched impact strength of the blend with 20 wt% PCL increases to 55.01 kJ m−2, which is 24.9 times higher than that of neat PLLA. The elongation at break is also increased from 5% to 139.4%, indicating the brittle − ductile transition. The increased interfacial binding strength through the reactive interfacial compatibility and the formation of a CPU network in the PLLA matrix account for the improved toughness of PLLA/CPU blends. Dynamic mechanical analysis results indicate that the compatibility between PLLA and CPU is improved with increasing CPU content resulting in the formation of more interfacial phase. In addition, rheological property measurements indicate that the improvement in storage modulus and complex viscosity is ascribed to the formation of a CPU network in the PLLA matrix.