Studies of network structure of rubber vulcanizates by a cryoscopic method: 4

Hidetoshi Oikawa, Kenkichi Murakami

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The freezing-point depression (FPD), ΔT, for unimodal and bimodal end-linked poly(dimethyl siloxane) (PDMS) networks swollen in benzene was measured. The crystal size parameter of benzene in frozen swollen networks, aH, introduced by Kuhn, which varies inversely as ΔT, was experimentally confirmed to be associated with the screening length and/or the radius of gyration of the network chain in swollen gels by using an expression of power-law type, and to reflect the inhomogeneity of network structure. Further, the values of aH of bimodal PDMS networks became lower than those of unimodal ones at the same equilibrium concentration of polymer in the swollen networks. Such a tendency was phenomenologically similar to that observed for degraded networks of rubber vulcanizates as compared with undegraded ones. Some discussion with respect to this fact has been carried out on the basis of the origin of FPD.

Original languageEnglish
Pages (from-to)1563-1568
Number of pages6
JournalPolymer
Volume27
Issue number10
DOIs
Publication statusPublished - 1986 Oct

Keywords

  • end-linked model network
  • freezing point depression
  • poly(dimethyl siloxane)
  • screening length
  • stress relaxation

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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