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Title: Synthesis and Characterization of Graft Copolymers Poly(isoprene-g-styrene) of High Molecular Weight by a Combination of Anionic Polymerization and Emulsion Polymerization

Journal Article · · Industrial and Engineering Chemistry Research
DOI:https://doi.org/10.1021/ie504457e· OSTI ID:1265397
 [1];  [2];  [1];  [2];  [3];  [2];  [1];  [2]
  1. Northwestern Polytechnical University, Xi'an (China)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
+ Show Author Affiliations

In this study, high molecular weight “comb-shaped” graft copolymers, poly(isoprene-g-styrene), with polyisoprene as the backbone and polystyrene as side chains, were synthesized via free radical emulsion polymerization by copolymerization of isoprene with a polystyrene macromonomer synthesized using anionic polymerization. A small amount of toluene was used in order to successfully disperse the macromonomer. Both a redox and thermal initiation system were used in the emulsion polymerization, and the latex particle size and distribution were investigated by dynamic light scattering. The structural characteristics of the macromonomer and comb graft copolymers were investigated through use of size exclusion chromatography, spectroscopy, microscopy, thermal analysis, and rheology. While the macromonomer was successfully copolymerized to obtain the desired multigraft copolymers, small amounts of unreacted macromonomer remained in the products, reflecting its reduced reactivity due to steric effects. Nevertheless, the multigraft copolymers obtained were very high in molecular weight (5–12 × 105 g/mol) and up to 10 branches per chain, on average, could be incorporated. A material incorporating 29 wt% polystyrene exhibits a disordered microphase separated morphology and elastomeric properties. As a result, these materials show promise as new, highly tunable, and potentially low cost thermoplastic elastomers.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265397
Journal Information:
Industrial and Engineering Chemistry Research, Vol. 54, Issue 4; ISSN 0888-5885
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (7)

Superstretchable, Self-Healing Polymeric Elastomers with Tunable Properties journal April 2018
Facile fabrication of poly(glycidyl methacrylate)- b -polystyrene functional fibers under a shear field and immobilization of hemoglobin journal January 2018
Rheological and thermal degradation properties of hyperbranched polyisoprene prepared by anionic polymerization journal November 2019
The Microscopic Structure–Property Relationship of Metal–Organic Polyhedron Nanocomposites journal November 2019
Block Copolymers: Synthesis, Self-Assembly, and Applications journal October 2017
The Microscopic Structure–Property Relationship of Metal–Organic Polyhedron Nanocomposites journal November 2019
Design, synthesis, and characterization of lightly sulfonated multigraft acrylate-based copolymer superelastomers journal January 2018

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