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Sandwich-structure styrene-butadiene-styrene block copolymer (SBS)/polypropylene (PP) blends: The role of PP molecular weight

Published online by Cambridge University Press:  12 March 2019

Ping Wang ,
Yanli Qi  and
Jun Zhang Open the ORCID record for Jun Zhang [Opens in a new window]
Ping Wang
Affiliation:
College of Materials Science & Engineering, Nanjing Tech University, Nanjing 210009, China; and Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, China
Yanli Qi
Affiliation:
College of Materials Science & Engineering, Nanjing Tech University, Nanjing 210009, China; and Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, China
Jun Zhang*
Affiliation:
College of Materials Science & Engineering, Nanjing Tech University, Nanjing 210009, China; and Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effect of polypropylene (PP) molecular weight on the properties of styrene-butadiene-styrene block copolymer (SBS)/PP blends was studied. All SBS/PP blends (50/50 and 90/10) exhibited a sandwich structure where the co-continuous SBS/PP layer was between the top and bottom PP layers. Solvent extraction tests suggested that the continuous phase structure of PP was independent of the blending ratio and PP molecular weight, while the SBS phase changed from a dispersed phase to a continuous phase as the SBS content increased. The decrease in PP molecular weight decreased the PP layer thickness but increased the phase domain size of SBS in SBS/PP(50/50) blends. As a result, less noticeable “stress-hardening” phenomenon was observed. The mechanism for the structural change was attributed to the different melt viscosities of each component. The crystallinity of the blends did not change with the variable PP molecular weight but decreased with the increasing SBS content.

Keywords

polymermolecular weightmorphology
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 6 , 28 March 2019 , pp. 982 - 990
Copyright
Copyright © Materials Research Society 2019 

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