Shear-induced Crystallization in Phase-separated Blends of Isotactic Polypropylene with Ethylene-Propylene-Diene Terpolymer

Citation: Gui-qiu Ma, Da Li, Jing Sheng. Shear-induced Crystallization in Phase-separated Blends of Isotactic Polypropylene with Ethylene-Propylene-Diene Terpolymer[J]. Chinese Journal of Polymer Science, 2015, 33(11): 1538-1549. doi: 10.1007/s10118-015-1705-0 shu

Shear-induced Crystallization in Phase-separated Blends of Isotactic Polypropylene with Ethylene-Propylene-Diene Terpolymer

Gui-qiu Ma ^{1,
,} ,
Da Li ^1, ,
Jing Sheng ^1,

1.
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, China

通讯作者: Gui-qiu Ma,

基金项目:
This work was financially supported by the National Natural Science Foundation of China (No. 51033004) and the Natural Science Foundation of Tianjin (No. 12JCYBJC11900).

摘要: The compatibility between isotactic polypropylene (iPP) and ethylene-propylene-diene terpolymer (EPDM) in the blends was studied. SAXS analysis indicates that iPP and EPDM phases in the binary blend are incompatible. Isothermal crystallization behaviors of iPP in phase-separated iPP/EPDM were studied by in situ POM equipped with a Linkam shear hot stage. It was found that typical spherulites of iPP were formed both in neat iPP and in iPP/EPDM blends. The radial growth rate (dR/dt) of spherulites of iPP in the blend was not influenced by EPDM phases. Further investigations on isothermal crystallization of iPP in iPP/EPDM after shear with a fixed shear time showed that the crystallization rate of iPP in the blends increased with increasing shear rates, whereas, the crystallization rate was much lower than that of neat iPP. WAXD results showed that -crystal iPP was formed in neat iPP as well as in iPP/EPDM blends after shearing and the percentage of -crystal bore a relationship to the applied shear rate. The presence of EPDM resulted in lower percentage of -crystal in the blends than that in neat iPP under the same constant shear conditions. SAXS experiments revealed that shear flow could induce formation of oriented lamellae in iPP and iPP in the blends, and the presence of EPDM led to a reduced fraction of oriented lamellae.

关键词:

English

Shear-induced Crystallization in Phase-separated Blends of Isotactic Polypropylene with Ethylene-Propylene-Diene Terpolymer

Gui-qiu Ma ^{1,
,} ,
Da Li ^1, ,
Jing Sheng ^1,

1.
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, China

Corresponding author: Gui-qiu Ma,

Received Date: 09 April 2015
Revised Date: 20 May 2015
Available Online: 05 November 2015
Fund Project:
This work was financially supported by the National Natural Science Foundation of China (No. 51033004) and the Natural Science Foundation of Tianjin (No. 12JCYBJC11900).

Abstract: The compatibility between isotactic polypropylene (iPP) and ethylene-propylene-diene terpolymer (EPDM) in the blends was studied. SAXS analysis indicates that iPP and EPDM phases in the binary blend are incompatible. Isothermal crystallization behaviors of iPP in phase-separated iPP/EPDM were studied by in situ POM equipped with a Linkam shear hot stage. It was found that typical spherulites of iPP were formed both in neat iPP and in iPP/EPDM blends. The radial growth rate (dR/dt) of spherulites of iPP in the blend was not influenced by EPDM phases. Further investigations on isothermal crystallization of iPP in iPP/EPDM after shear with a fixed shear time showed that the crystallization rate of iPP in the blends increased with increasing shear rates, whereas, the crystallization rate was much lower than that of neat iPP. WAXD results showed that -crystal iPP was formed in neat iPP as well as in iPP/EPDM blends after shearing and the percentage of -crystal bore a relationship to the applied shear rate. The presence of EPDM resulted in lower percentage of -crystal in the blends than that in neat iPP under the same constant shear conditions. SAXS experiments revealed that shear flow could induce formation of oriented lamellae in iPP and iPP in the blends, and the presence of EPDM led to a reduced fraction of oriented lamellae.

Key words:

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Shear-induced Crystallization in Phase-separated Blends of Isotactic Polypropylene with Ethylene-Propylene-Diene Terpolymer

通讯作者: Gui-qiu Ma,

English

Shear-induced Crystallization in Phase-separated Blends of Isotactic Polypropylene with Ethylene-Propylene-Diene Terpolymer

Corresponding author: Gui-qiu Ma,

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

Shear-induced Crystallization in Phase-separated Blends of Isotactic Polypropylene with Ethylene-Propylene-Diene Terpolymer

通讯作者: Gui-qiu Ma,

English

Shear-induced Crystallization in Phase-separated Blends of Isotactic Polypropylene with Ethylene-Propylene-Diene Terpolymer

Corresponding author: Gui-qiu Ma,

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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