Polydimethylsiloxane assisted supercritical CO<sub>2</sub> foaming behavior of high melt strength polypropylene grafted with styrene

doi:10.1007/s11705-016-1577-z

Front. Chem. Sci. Eng.

2016, Vol. 10

Issue (3) : 396-404 https://doi.org/10.1007/s11705-016-1577-z

RESEARCH ARTICLE

Polydimethylsiloxane assisted supercritical CO₂ foaming behavior of high melt strength polypropylene grafted with styrene

Weixia Wang¹,Shuai Zhou¹,Zhong Xin^1,^2,^*(

),Yaoqi Shi^1,³,Shicheng Zhao¹

¹. Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
². State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
³. Shanghai Key Laboratory of Catalysis Technology for Polyolefin, Shanghai Research Institute of Chemical Industry, Shanghai 200062, China

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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 CO₂ 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 CO₂ 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.

Keywords high melt strength polypropylene (HMSPP) polydimethylsiloxane (PDMS) supercritical CO₂ foaming behavior

PACS:

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Corresponding Author(s): Zhong Xin

Just Accepted Date: 14 June 2016 Online First Date: 22 July 2016 Issue Date: 23 August 2016

Cite this article:

Weixia Wang,Shuai Zhou,Zhong Xin, et al. Polydimethylsiloxane assisted supercritical CO₂ foaming behavior of high melt strength polypropylene grafted with styrene[J]. Front. Chem. Sci. Eng., 2016, 10(3): 396-404.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-016-1577-z
https://academic.hep.com.cn/fcse/EN/Y2016/V10/I3/396

Tab.1 Physical parameters of PDMS

Fig.1 FTIR spectra of neat iPP and HMSPP

Tab.2 A₇₀₀/A₈₄₁ and MFR of neat iPP and HMSPP

Fig.2 Complex viscosity (η*) versus angular frequency (ω) for neat iPP and HMSPP at 200 °C

Fig.3 Fig. 3 Storage modulus (G') versus angular frequency (ω) for neat iPP and HMSPP at 200 °C

Fig.4 Fig. 4 Transient elongational viscosity as a function of time for neat iPP and HMSPP at 190 °C

Fig.5 Cell morphologies of (a) neat iPP and HMSPP: (b) PP0, (c) PP1, (d) PP2, (e) PP3 and (f) PP4 foamed at 155 °C and 12 MPa

Fig.6 Cell size distribution of (a) neat iPP foam and HMSPP foams: (b) PP0, (c) PP1, (d) PP2, (e) PP3 and (f) PP4

Tab.3 Cell density, average cell diameter and expansion rate of neat iPP and HMSPP foams

Fig.7 CO₂solubility in neat iPP and HMSPP at 155 °C and different pressures

Fig.8 Fracture morphologies of (a) neat iPP, (b) PP0, (c) PP1, (d) PP2, (e) PP3 and (f) PP4

Fig.9 Cell morphologies of (a) PP1-0.5, (b) PP1-1.0 and (c) PP1-4.0 foamed at 155 ^oC and 12 MPa

Fig.10 Cell size distributions of (a) PP1-0.5, (b) PP1-1.0 and (c) PP1-4.0

Fig.11 Fracture morphologies of (a) PP1-0.5, (b) PP1-1.0 and (c) PP1-4.0

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