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Uniform to accelerated crystal twisting transition in deuterate polyethylene/poly(ethylene-alt-propylene) blend films
Zhang, LN; Shi, WC; Han, CC; Cheng, H;程贺
刊名CHINESE JOURNAL OF POLYMER SCIENCE
2014
卷号32期号:9页码:1260-1270
关键词Polyethylene/poly(ethylene-alt-propylene) (d-PE/PEP) blend Phase separation Crystallization
学科分类Polymer Science
DOI10.1007/s10118-014-1500-3
英文摘要A uniform to accelerated crystal twisting transition is observed in deuterate polyethylene/poly(ethylene-altpropylene) (d-PE/PEP) blend films. And the band period is a function of initial d-PE concentration, quench depth and annealing time of phase separation. As Keith and Padden suggested, twisting of lamella is due to the unbalanced stress on its both sides, which can supply a satisfying explanation to banded spherulites formed in homogeneous systems. When it comes to d-PE/PEP blend system, in homogeneous 99% d-PE/PEP (weight fraction of d-PE) blend film, the formation of banded spherulite is observed as a result of uniform twisting of ribbon like d-PE lamellae along the radial direction. With the amorphous PEP piling up, it transfers into accelerated edge-on to flat-on twisting due to crystallization assisted phase separation. The mechanism can be interpreted as following: d-PE molecules must inter-diffuse to the twisting growth front to continue the secondary nucleation and growth process. Meanwhile, the amorphous PEP molecules are rejected and accumulated at the twisting growth front. Once the d-PE lamella begins to twist because of unbalanced stress on both sides, the accumulated rubber phase at the growth front strengthens the unbalance and accelerates the edge-on to flat-on twisting. The concentration wave propagates further away with constant speed, and leads to concentric ring pattern with periodic nonuniform twisting along the radial direction. Since this is a kinetic effect, the band period can be controlled through initial d-PE concentration, quench depth and annealing time of phase separation. Our result shows that crystallization assisted phase separation can modify lamella growth kinetic pathway, thereby assisting concentric ring pattern formation.
收录类别SCI
WOS记录号WOS:000339881900016
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224893
专题东莞分部_期刊论文
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GB/T 7714
Zhang, LN,Shi, WC,Han, CC,et al. Uniform to accelerated crystal twisting transition in deuterate polyethylene/poly(ethylene-alt-propylene) blend films[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2014,32(9):1260-1270.
APA Zhang, LN,Shi, WC,Han, CC,&Cheng, H;程贺.(2014).Uniform to accelerated crystal twisting transition in deuterate polyethylene/poly(ethylene-alt-propylene) blend films.CHINESE JOURNAL OF POLYMER SCIENCE,32(9),1260-1270.
MLA Zhang, LN,et al."Uniform to accelerated crystal twisting transition in deuterate polyethylene/poly(ethylene-alt-propylene) blend films".CHINESE JOURNAL OF POLYMER SCIENCE 32.9(2014):1260-1270.
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