Zhen-jiang Zhang, Tao Tang, Li-li Zhu, Kai Wei, Lei Qiao. The Investigation on Crystallization Behavior and Foamability of Long Chain Branched Polypropylene. [J]. Acta Polymerica Sinica (4):457-463(2016)
DOI:
Zhen-jiang Zhang, Tao Tang, Li-li Zhu, Kai Wei, Lei Qiao. The Investigation on Crystallization Behavior and Foamability of Long Chain Branched Polypropylene. [J]. Acta Polymerica Sinica (4):457-463(2016) DOI: 10.11777/j.issn1000-3304.2016.15227.
The Investigation on Crystallization Behavior and Foamability of Long Chain Branched Polypropylene
The crystallization behavior of long chain branched polypropylene (LCBPP) and linear isotactic polypropylene (PP) was studied by DSC
WAXD and POM.The results of WXAD and DSC showed that the LCB structure was conductive to -crystal crystallization
a little of -crystal appeared in LCBPP samples.The results of POM and DSC verified that the LCB structure can perform the function of promoting heterogeneous nucleation and decreasing crystal size.Compared with pure PP
the crystallization temperature and crystallization rate of LCBPP increased.The crystal size of LCBPP decreased with the increased branching content.The higher crystallization temperature and faster crystallization rate of LCBPP were in favor of bubble curing and increased the maximum foaming temperature.In addition
because of the higher melt strength of LCBPP
the LCBPP showed bigger expanding ratio than linear PP at the same foaming condition.The results of batch foaming with supercritical CO2 as blowing agent at 18 MPa showed that the LCBPP displayed a better foamability than linear PP.The LCBPP exhibited a wide foaming temperature window (about 5 K) while linear PP exhibited a very narrow foaming temperature window (about 2 K) and the maximum expantion ratio of LCBPP was 25.8 while the maximum expantion ratio of linear PP was only 18.6.
关键词
长链支化聚丙烯结晶发泡
Keywords
Long chain branched polypropyleneCrystallizationFoaming
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Related Author
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Related Institution
SINOPEC Beijing Research Institute of Chemical Industry
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology
Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, School of Polymer Science and Engineering, Qingdao University of Science & Technology
Bohai Rim Collaborative Innovation Center on Green Chemical Application Technology, Department of Chemical Engineering, Weifang Vocational College