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本文介绍了最近研制成功并用于材料热强度应变测量、耐热300℃、灵敏系数K>1.85和应变极限ε>8％,具有独特力学性能的耐高温高塑性(大)应变胶粘剂。以Ⅳ号胶为代表着重研究了这些溶液型共聚-共混聚酰胺酸在热酰亚胺化为最终产物过程中,各个阶段的特征及对性能的影响。结果发现,急剧酰亚胺化(155℃附近)之后,聚合物的T(>280℃)便已接近最大值,认为继续的酰亚胺化反应至完全(225℃附近)是在软玻璃态中进行的。文中确定了该胶粘剂呈现优良应变特性和粘结性的热-酰亚胺化温度是250—260℃。
In this paper, we introduce the recently developed high temperature and high plasticity (large) strain adhesive with unique mechanical properties, which is used to measure the hot strength and strain of materials, heat resistance 300 ℃, sensitivity coefficient K> 1.85 and strain limit ε> 8%. Taking the No. 4 glue as the representative, the characteristics and the influence on the performance of these solution-type copolymerization-blending polyamic acids during the process of thermal imidization into the final product are mainly studied. As a result, it was found that the T (> 280 ° C) of the polymer was approaching the maximum value after the sharp imidization (near 155 ° C), and it was considered that the continued imidization reaction to the complete (near 225 ° C) In the The thermal-imidization temperature at which the adhesive exhibits excellent strain characteristics and cohesion is determined to be 250-260 ° C.