Citation: Li-na Zhang, Wei-chao Shi, Charles C Han, He Cheng. 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. doi: 10.1007/s10118-014-1500-3 shu

Uniform to Accelerated Crystal Twisting Transition in Deuterate Polyethylene/Poly(ethylene-alt-propylene) Blend Films

1.
State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2.
China Spallation Neutron Source, Institute of High Energy Physics, Chinese Academy of Sciences, Dongguan 523803, China

Received Date: 27 April 2014
Revised Date: 10 May 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 50930003 and 21174152).

A uniform to accelerated crystal twisting transition is observed in deuterate polyethylene/poly(ethylene-alt-propylene) (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.
- Polyethylene/poly(ethylene-alt-propylene) (d-PE/PEP) blend,
- Phase separation,
- Crystallization
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沈阳化工大学材料科学与工程学院沈阳 110142