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Oriented crystallization of crosslinked $$cis$$-1,4-polybutadiene rubber

シス1,4-ポリブタジエン架橋ゴムの配向結晶化

西条 賢次*; Zhu, Y.*; 橋本 竹治; Wasiak, A.*; Brzostowski, N.*

Saijo, Kenji*; Zhu, Y.*; Hashimoto, Takeji; Wasiak, A.*; Brzostowski, N.*

架橋した$$cis$$-1,4-ポリブタジエン(PB)ゴムは、力学変形により配向結晶化することが知られている。本研究では、さまざまな分子配向度を有するPBゴムに発現する分子配向に誘起された結晶化過程を小角X線散乱,広角X線回析,応力緩和実験によりその場,実時間観測・解析を行った。一定の分子配向度の下での等温結晶化については、無配向,弱-中程度配向,高配向度の三種類の試料を用い、結晶化温度の関数として実験した。無配向,弱-中程度配向試料については核形成-成長による結晶化,高配向試料については、スピノーダル結晶化が発現することを世界で初めて明らかにした。

Crosslink $$cis$$-1,4-polybutadiene (PB) rubber is known to undergo crystallization during mechanical deformation. This article presents small-angle X-ray scattering (SAXS), wide-angle X-ray scattering (WAXS), and stress-relaxation studies of the structural development in crosslinked PB samples crystallized under various orientation regimes. The studies are concerned with isothermal crystallization at various temperatures (10 to -50$$^{circ}$$C) and at constant elongation ratios (1-4,5) and hence with the effects of weak -to-intermediate and high orientations on oriented crystalliation versus the behavior of unoriented specimens. Although the crystallization in the weak-to-intermediate orientations is interpreted on the basis of nucleation growth, the crystallization under high orientations is best interpreted on the basis of spinodal crstallization. To the best of our knowledge, this work reports for the first time spinodal-like crystallization on oriented crosslinked polymer melts.

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パーセンタイル:44.18

分野:Polymer Science

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