短纤维增强发泡橡胶复合材料高低温压缩性能

Compressive property of short fiber reinforced foam rubber composite materials at high and low temperatures

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温度下的压缩性能进行测试。结果表明：在213 K时,SFRFRC的压缩性能发生明显变化,已经由高弹态转变为玻璃态,而玻璃化转变温度在213-233 K之间。纤维体积分数和发泡率均对SFRFRC的耐低温性能有很大影响。短纤维的添加和适当改变发泡率都明显改善了SFRFRC在低温下的压缩性能。在定160 N和5 mm条件下,同一发泡率、不同纤维体积分数的SFRFRC,压缩永久变形随着纤维体积分数的增加而呈指数下降;而5%纤维体积分数、不同发泡率的SFRFRC,压缩永久变形随着发泡率的增大而增大。

To provide a theoretical basis for developing heat-resisting material and cryogenic temperature material,the tensile properties of nylon short fiber reinforced foam rubber composites（SFRFRC））with the identical spongy rate but different short fiber volume fractions and the identical short fiber volume fraction but differently spongy rates were tested at 213～398 K.The results show that the compressive properties of SFRFRC changed obviously from high-elastic state to glass state at 213 K,and the glass transition temperatures are in the range of 213～233 K.Short fiber volume fraction and spongy rate have a significant effect on the low-temperature-resistant properties of the SFRFRC.It can significantly improve the compressive properties of SFRFRC by adding the short fiber volume fraction and changing appropriately the spongy rate at low temperatures.Under conditions of 160 N and 5 mm,the permanent compression set of SFRFRC with the identical spongy rate but different short fiber volume fractions decreases with the short fiber volume fraction increasing,and the permanent compression set of SFRFRC with 5% short fiber volume fraction with different spongy rates increases with the spongy rate increasing.