Morphology and fracture behaviour of poly(vinyl chloride)/ethylene-vinyl acetate copolymer blends
Morphology and fracture behaviour of poly(vinyl chloride)/ethylene-vinyl acetate copolymer blends
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聚氯乙烯/乙烯-醋酸乙烯酯共聚物共混物的形貌和断裂行为
DOI：
10.1016/j.polymertesting.2006.12.008
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发表时间：
2007-05
期刊：
影响因子：
5.1
通讯作者：
Zhang, Wei-qin
中科院分区：
文献类型：
--
作者：
Yang, Wei;Liu, Ying;Yang, Ming-Bo;Xie, Bang-Hu;Feng, Jian-min;Zhang, Wei-qin
制备了聚氯乙烯（PVC）/乙烯-醋酸乙烯酯共聚物（伊娃）共混物，研究了伊娃含量对共混物相形态和断裂行为的影响。结果清楚地表明相变对共混物断裂韧性的显著影响。当伊娃含量较低（<7份）时，伊娃以分散的小颗粒形式分散在PVC基体中，随着伊娃含量的增加，伊娃颗粒数量增加，分散颗粒间的距离减小，比断裂功（we）增加。虽然屈服前的比EWF（we，y）降低，但在颈缩和撕裂阶段比断裂基本功（we，n）的增加是Wevalues增加的原因。当伊娃含量达到9份时，伊娃颗粒相互粘附形成共格相，导致wee，y和wee，n同时下降。另一方面，比塑性功βwp几乎不受伊娃含量增加的影响。
Poly (vinyl chloride) (PVC)/ethylene-vinyl acetate copolymer (EVA) blends were prepared to investigate the effect of EVA content on the phase morphology and fracture behaviour, evaluated by means of the essential work of fracture method (EWF). The results clearly showed the prominent influence of phase transformation on fracture toughness of the blends. At low EVA content (<7phr), EVA was dispersed in the PVC matrix as separated small particles, and with increase in EVA content increasing the number of EVA particles increased, resulting in diminished distance between the dispersed particles and an increase in specific essential work of fracture (we). The enhanced wevalues were attributed to the increase of specific essential work of fracture in the necking and tearing stage (we,n), although the specific EWF before yielding (we,y) decreased. When EVA content was up to 9phr, the EVA particles were observed to adhere to each other and formed a coherent phase, which caused sharp decrease of weas the result of simultaneous decrease of we,yand we,n. On the other hand, the specific plastic work, βwp, was barely affected by the increase of EVA content.
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影响因子：
3
作者：
S. Svanson;C. Elmqvist;Y. Shur;B. Rånby
通讯作者：
S. Svanson;C. Elmqvist;Y. Shur;B. Rånby
影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
6
作者：
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通讯作者：
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