Uniform to accelerated crystal twisting transition in deuterate polyethylene/poly(ethylene-alt-propylene) blend films
文献类型：期刊论文
| 作者 | Zhang, LN; Shi, WC; Han, CC; Cheng, H;程贺 |
| 刊名 | CHINESE JOURNAL OF POLYMER SCIENCE
 |
| 出版日期 | 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 |
| 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. |
| 学科主题 | Polymer Science |
| 收录类别 | SCI |
| WOS记录号 | WOS:000339881900016 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/224893]  |
| 专题 | 高能物理研究所_东莞分部 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：高能物理研究所
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