Phase-Selective Curing of Poly(p-Methylstyrene-b-Butadiene-b-p-Methylstyrene)

  • Roderic P. Quirk
  • Michael T. Sarkis
  • Dale J. Meier


The preparation, properties and phase-selective crosslinking reactions of poly(p-methylstyrene-b-butadiene-b-p-methylstyrene), PMS-BD-PMS, have been examined. The PMS-BD-PMS triblock copolymer was synthesized anionically by sequential monomer addition. The ability to selectively crosslink the poly(p-methylstyrene) end-block segments was examined by curing with various polymers containing hydroperoxide end groups. Both polystyrene hydroperoxide, PSO2H, and poly(p-methylstyrene) hydroperoxide, PMSO2H, were found to significantly increase tensile stress at break and the percent elongation-at-break of the PMS-BD-PMS triblock copolymer. In addition, the modified triblock copolymer was insoluble in toluene, heptane and methyl ethyl ketone. When unfunctionalized styrene homopolymer was added the effects were quite different. These results have been compared to the unselective, non-phase-selective peroxide, dicumyl peroxide, which dramatically decreases the elastomeric properties of the triblock copolymer after curing. In addition, the specificity of this effect has been investigated by carrying out equivalent experiments with an analogous poly(styrene-b-butadiene-b-styrene), PS-BD-PS, triblock copolymer. No enhancement of tensile properties was observed on the treatment. of the PS-BD-PS triblock copolymer with PS02H, followed by curing. The phase-selective curing of PMS-BD-PMS resulted in a product with better tensile properties at 70ºC than that observed for the corresponding uncured PMS-BD-PMS and PS-BD-PS triblock copolymers.


Block Copolymer Triblock Copolymer Methyl Ethyl Ketone Dynamic Mechanical Thermal Analyzer Thermoplastic Elastomer 
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Copyright information

© Springer Science+Business Media New York 1986

Authors and Affiliations

  • Roderic P. Quirk
    • 1
  • Michael T. Sarkis
    • 1
  • Dale J. Meier
    • 2
  1. 1.Institute of Polymer ScienceThe University of AkronAkronUSA
  2. 2.Michigan Molecular InstituteMidlandUSA

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