Effect of network structure on thermal and mechanical properties of biphenol-type epoxy resins cured with phenols
Effect of network structure on thermal and mechanical properties of biphenol-type epoxy resins cured with phenols
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DOI：
10.1002/app.1995.070560916
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发表时间：
1995-05
影响因子：
3
通讯作者：
M. Ochi;N. Tsuyuno;K. Sakaga;Y. Nakanishi;Y. Murata
中科院分区：
文献类型：
--
作者：
M. Ochi;N. Tsuyuno;K. Sakaga;Y. Nakanishi;Y. Murata
在用邻苯二酚酚醛清漆（CN）固化的双酚型环氧树脂中，观察到非常弱的玻璃化转变，因此，观察到非常高的橡胶模量。另一方面，在用酚醛清漆（PN）固化的体系中清楚地观察到玻璃化转变。这意味着在用CN固化的体系中，网络链的微布朗运动被高度抑制。从网络链构象的角度，探讨了CN固化体系中链运动受到抑制的原因。双酚型树脂玻璃化转变的消失取决于固化剂中活性氢的形成。因此，有人建议，微布朗运动的抑制是由于在网络中的联苯基团的取向。此外，研究表明，通过抑制CN固化双酚树脂体系中的网络链运动，高温下的机械强度和粘结强度得到了显着提高。© 1995 John Wiley & Sons，Inc.
In the biphenol-type epoxy resin cured with catechol novolac (CN), a very weak glass transition and, thus, a very high rubbery modulus were observed. On the other hand, the glass transition was clearly observed in the system cured with phenol novolac (PN). This means that the micro-Brownian motion of network chains is highly suppressed in the system cured with CN. The reason for this suppression of the chain motion in the CN-cured system has been pursued from the viewpoint of the conformation of network chains. The disappearance of the glass transition in the biphenol-type resin depends on the formation of the active hydrogens in the curing agents. Thus, it was suggested that the suppression of the micro-Brownian motion is due to the orientation of the biphenyl groups in the network. Moreover, it has been shown that the mechanical and bonding strength at high temperature is considerably improved by the suppression of the network chain motion in the CN-cured biphenol resin system. © 1995 John wiley & Sons, Inc.