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Citation: HUANG Yi-Ping, ZHANG Yan, CHEN Lei, CHEN Ye, CHEN Guang-Mei. Effects of Nucleating Agent and Nano-Calcium Carbonate on Crystallization Behavior and Mechanical Properties of Polypropylene[J]. Chinese Journal of Applied Chemistry, ;2008, 25(1): 67-72. shu

Effects of Nucleating Agent and Nano-Calcium Carbonate on Crystallization Behavior and Mechanical Properties of Polypropylene

1.
School of Chemistry and Chemical Engineering, Anhui University, Key Laboratory of Environment-friendly Polymer Materials of Anhui Province, Anhui University, Hefei

Corresponding author: HUANG Yi-Ping,
Received Date: 24 January 2007
Available Online: 28 June 2007
Fund Project: 安徽省教育厅重点科研资助项目(2005kj019zd) (2005kj019zd)

The nucleating agent 1,3;2,4-di-p-chlorinbenzylidene sorbitol(CDBS) and nano-calcium carbonate(nano-CaCO₃) were added in polypropylene(PP).The results of DSC indicate that the crystallization rate and the crystallization temperature of PP increased with the addition of nano-calcium carbonate particles,while the crystallinity of PP did not change obviously.The crystallization temperature of PP with nucleating agent CDBS was higher than that of non-nucleated PP by about 20℃.The crystallization rate and the crystallinity of PP increased with the addition of CDBS,with the crystallinity of PP reaching 38%.The results of XRD and PLM show that the nucleating density increased obviously when CDBS was added into the samples.But the crystal structure of the α-form of polypropylene was essentially unaffected by the nucleating agent.CDBS was an effective nucleating agent for PP.The haziness of the sample decreased from 56% to 12% with the addition of CDBS and CDBS was a good transparent agent for PP.The nucleating agent and the nanoparticles could increase the tensile strength and impact strength of PP.The impact strength of PP increased from 33 J/m to about 44 J/m.But CDBS reduced the ultimate strain of the sample by about 26%.
- polypropylene,
- di-p-chlorinbenzylidene sorbitol,
- nano-Calcium carbonate,
- crystallization behavior,
- haziness,
- mechanical properties
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