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为开发新型耐高温和耐低温材料提供理论依据,对同一发泡率、不同纤维体积分数和同一纤维体积分数、不同发泡率的锦纶短纤维增强发泡橡胶复合材料(以下简称SFRFRC)在213~398 K温度下的拉伸性能进行测试。结果表明:常温下,增大短纤维体积分数和减小发泡率均能提高材料的拉伸性能;在不同温度下,短纤维增强发泡橡胶复合材料的初始模量、断裂强度均随着温度的升高而减小,而断裂伸长率随着温度的升高先增大后减小,玻璃化转变温度在213~233 K之间。同时,短纤维的添加虽未改变SFRFRC的玻璃化转变温度,但使玻璃化转变温度范围变宽。温度为398 K时,SFRFRC的初始模量、断裂强度、断裂伸长率均达到最低值,这与橡胶的硫化温度有关,橡胶的硫化温度为423 K,越接近硫化温度,SFRFRC的拉伸性能就越差。
In order to provide a theoretical basis for the development of new high temperature and low temperature resistant materials, for the same foaming rate, different fiber volume fraction and the same fiber volume fraction, different foam ratio of nylon staple fiber reinforced rubber foam composites (hereinafter referred to as SFRFRC) Tensile properties at temperatures up to ~ 398 K were tested. The results show that under normal temperature, the increase of the short fiber volume fraction and the decrease of the foaming rate can improve the tensile properties of the material. The initial modulus and the breaking strength of the short fiber reinforced foam rubber composites at different temperatures are The temperature increases and decreases, while the elongation at break increases with the increase of temperature and then decreases, the glass transition temperature is between 213 ~ 233 K. At the same time, the addition of short fibers did not change the glass transition temperature of SFRFRC, but broadened the glass transition temperature range. When the temperature is 398 K, the initial modulus, breaking strength and elongation at break of SFRFRC reach the lowest value, which is related to the curing temperature of rubber. The vulcanization temperature of rubber is 423 K, the closer to the vulcanization temperature, the tensile property of SFRFRC The worse it is.