一、前 言 高分子材料的耐热性主要取决于两个因素:一是它的分解,另一个是它的软化。对于结构用高分子材料,其耐热性主要指后者,因为要使它在高温下保持某种水平的刚度、强度、形状稳定性是十分重要的。评价高分子材料的耐热性的指标之一是所谓“马丁耐热”,但试验表明,用这个指标对纤维增强的高聚物 I. Introduction The heat resistance of polymer materials depends on two factors: one is its decomposition, the other is its softening. For structural polymer materials, the heat resistance mainly refers to the latter, because it is important to maintain a certain level of rigidity, strength and shape stability at high temperatures. One of the indices for evaluating the heat resistance of polymer materials is the so-called “Martin heat-resistant”, but tests have shown that using this indicator for fiber-reinforced polymer