Frontiers of Chemical Science and Engineering
>> 2016,
Volume 10,
Issue 3
doi:
10.1007/s11705-016-1577-z
RESEARCH ARTICLE
Polydimethylsiloxane assisted supercritical CO
. Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
.. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
.. Shanghai Key Laboratory of Catalysis Technology for Polyolefin, Shanghai Research Institute of Chemical Industry, Shanghai 200062, China
Accepted: 2016-07-22
Available online: 2016-08-23
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Abstract
Foamable high melt strength polypropylene (HMSPP) was prepared by grafting styrene (St) onto polypropylene (PP) and simultaneously introducing polydimethylsiloxane (PDMS) through?a?one-step?melt extrusion process. The effect of PDMS viscosity on the foaming behavior of HMSPP was systematically investigated using supercritical CO as the foaming agent. The results show that the addition of PDMS has little effect on the grafting reaction of St and HMSPP exhibits enhanced elastic response and obvious strain hardening effect. Though the CO solubility of HMSPP with PDMS (PDMS-HMSPP) is lower than that of HMSPP without PDMS, especially for PDMS with low viscosity, the PDMS-HMSPP foams exhibit narrow cell size distribution and high cell density. The fracture morphology of PDMS-HMSPP shows that PDMS with low viscosity disperses more easily and uniformly in HMSPP matrix, leading to form small domains during the extrusion process. These small domains act as bubble nucleation sites and thus may be responsible for the improved foaming performance of HMSPP.
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