Toughening modification of PLLA/PBS blends via in situ compatibilization
Toughening modification of PLLA/PBS blends via in situ compatibilization
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DOI：
10.1002/pen.21210
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发表时间：
2009
影响因子：
3.2
通讯作者：
Ruyin Wang;Shifeng Wang;Y. Zhang;C. Wan;Ma Piming
中科院分区：
文献类型：
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作者：
Ruyin Wang;Shifeng Wang;Y. Zhang;C. Wan;Ma Piming
在过氧化二异丙苯（DCP）存在下制备了由聚（L-乳酸）（PLLA）和聚（丁二酸丁二醇酯）（PBS）组成的可生物降解聚合物共混物。研究了DCP含量对共混物力学性能、热学和流变行为、相形态以及增韧机制的影响。添加0.05-0.2份DCP后，PLLA/PBS（80/20）共混物的缺口悬臂梁冲击强度显着增加，但强度和模量随着DCP含量的增加而单调下降。 PBS在低于其熔化温度的环境温度下充当成核剂，加速PLLA的结晶速率，但对其最终结晶度影响不大。随着DCP含量的增加，PBS的结晶度和PLLA的冷结晶能力逐渐降低。 DCP 的添加导致共混物在低频下的粘度增加，以及 PBS 颗粒更精细的分散以及 PLLA 和 PBS 之间更好的界面粘附，表明两种组分之间发生了原位增容。添加DCP后PLLA/PBS共混物的光学透明度显着提高，这与共混物的结晶行为和相结构一致。聚合物。 ENG。 SCI.，2009。© 2008 塑料工程师学会
Biodegradable polymer blends consisting of poly(L-lactic acid) (PLLA) and poly(butylene succinate) (PBS) were prepared in the presence of dicumyl peroxide (DCP). The effects of DCP content on the mechanical properties, thermal and rheological behavior, phase morphology as well as the toughening mechanism of the blends were investigated. The notched Izod impact strength of PLLA/PBS (80/20) blend significantly increased after the addition of 0.05–0.2 phr DCP, but the strength and modulus monotonically decreased with increasing DCP content. PBS acted as a nucleating agent at the environmental temperature below its melting temperature and accelerated the crystallization rate of PLLA but had little effect on its final degree of crystallinity. The degree of crystallinity of PBS and the cold crystallization ability of PLLA gradually reduced with increasing DCP content. The addition of DCP induced an increase in viscosity of the blends at low frequencies as well as finer dispersion of PBS particles and better interfacial adhesion between PLLA and PBS, indicating the in situ compatibilization occurred between the two components. The optical clarity of PLLA/PBS blends was significantly improved after the addition of DCP, which was in accordance with the crystallization behavior and phase structure of the blends. POLYM. ENG. SCI., 2009. © 2008 Society of Plastics Engineers