NDLI: The component miscibility evolution during polymerization of the polybutadiene containing styrene solutions

Content Provider	Springer Nature Link
Author	Yavarizadeh, Mohammad Mohsen Mohammadi, Naser
Copyright Year	2013
Abstract	In situ graft copolymerization of polystyrene (PS) on polybutadiene (PB) during polymerization of PB solution in styrene monomer was investigated to determine the performance of grafting process, chain structure of generated copolymers, and their effectiveness as compatibilizing agents for incompatible PS-rich and PB-rich phases. The amount of copolymers and their chain structures at different stages of polymerization were determined by gel permeation chromatography (GPC) curves of the reactive blends (taken directly from the reaction) and physical blends (physically prepared based on total composition of reactive blends). It was demonstrated that copolymer formation started from the early stage of polymerization and continued up to the phase inversion stage. In addition, PS grafting on PB occurred initially via single-chain attachment and then converted to a double-chain scenario later on. Compatibilizing efficiency of the copolymers was evaluated by Huggins coefficient (k $_{H}$) obtained by performing dilute solution viscometry (DSV) on samples taken at different stages of conversions. The effect of molecular weight of PB on the grafting process and the effectiveness of copolymers generated were also studied. It was found that while compatibilizing role of the copolymers produced from high molecular weight PB (HPB) increases as conversion goes further, the compatibilizing efficiency of the copolymers produced from low molecular weight PB (LPB) shows a very sharp variation in a small range of conversion. Plotting k $_{H}$ of physical blends against weight fraction of PB molecules in solid content of the solutions (w $_{PB}$) showed negative deviation from mixture law with a W-like pattern containing two minima with a maximum in between. While a negative deviation was assumed as indication of immiscibility of the components, upward deviation at middle values of w $_{PB}$ was attributed to molecular segregations that reduce the interface between the incompatible PS-rich and PB-rich phases.
Starting Page	399
Ending Page	407
Page Count	9
File Format	PDF
ISSN	10261265
Journal	Iranian Polymer Journal
Volume Number	22
Issue Number	6
e-ISSN	17355265
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-04-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Graft copolymer Polymerization Ceramics, Glass, Composites, Natural Methods Polybutadiene Miscibility evolution Styrene solutions
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Polymers and Plastics

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