BULK PROPERTIES OF SYNDIOTACTIC 1, 2-POLYBUTADIENE IN RELATION WITH THE MOLECULAR CONFIGURATION

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Other Title
  • シンジオタクチック1, 2-ポリブタジエンの構造と基礎物性
  • シンジオタクチック 1 2 ポリブタジエン ノ コウゾウ ト キソ ブッセイ

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Description

In order to investigate the relationship between the molecular configuration and the bulk properties of syndiotactic 1, 2-polybutadiene, a series of samples with different degrees of crystallinity (below 46%) were prepared by the method reported previouly by Takeuchi et al.<BR>Infrared and C13-NMR spectra indicated that the content of 1, 2 unit with syndiotactic configuration is mainly responsible for the degree of crystallinity.<BR>Morphological observation of the samples was made by means of electron microscope using the ultrathin sections stained by OsO4. It was found that the crystal is composed of radiating fibrils whose diameter is about 30±5 Å in all cases, which is five to seven times as large as the length of c axis. DSC thermogram of the samples indicated that the melting behavior is very similar to that of copolymers with crystallizable and non-crystallizable components, in the following points. 1) The thermogram has a wide melting temperature range. 2) The melting temperature depends greatly on the content of syndiotactic 1, 2 unit.<BR>By applying Flory's theory concerning the melting temperature of a copolymer, the following fact was made clear, that is, the propagation probability of the crystallizable unit (synd. 1, 2) is expected to be much larger than the content of the component and nearly unity.<BR>The above results conclude that the polymer chain propagates in a manner similar to that of a block copolymer.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 49 (3), 190-194, 1976

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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