Journal
EXPRESS POLYMER LETTERS
Volume 6, Issue 9, Pages 739-749Publisher
BUDAPEST UNIV TECHNOL & ECON
DOI: 10.3144/expresspolymlett.2012.79
Keywords
mechanical properties; ethylene-propylene random copolymer; beta-nucleating agent; nano-CaCO3; crystallization
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Funding
- Natural Science Foundation of China [51173207]
- Sino-Hungarian Scientific and Technological Cooperation Project [2009DFA52660]
- Natural Science Foundation of Guangdong, China [2010B010800020]
- Key Laboratory for Nonmetallic Composites and Functional Materials of Sichuan Province [2410zxfk24]
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To provide ethylene-propylene random copolymer (PPR) with balanced mechanical properties, beta-nucleating agent and CaCO3 nanoparticles are incorporated into PPR matrix by melt blending. It is found that crystallization rate and relative content of beta-crystal increase with the addition of beta-nucleating agent together with nanoparticles. Size of PPR spherulite is greatly reduced, and a specific morphology appears, in which alpha-crystal lamella is grown upon the beta-nucleus. The results suggest that both beta-nucleating agent and nano-CaCO3 have heterogeneous nucleation and synergistic effects on beta-nucleation of PPR. Mechanical characterization shows that mechanical properties of PPR can be tuned by incorporation of beta-nucleating agent and nano-CaCO3 particles. Under suitable compositions, low temperature impact strength and high temperature creep resistance of PPR, the bottlenecks of application of such material, can be simultaneously improved without sacrificing the Youngs'modulus and tensile strength.
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