通过对取代工艺进行优化,制备了不同六氟异丙氧基引入量的氟化聚磷腈弹性体(PTHOP),探究了六氟异丙氧基的引入对于氟化聚磷腈弹性体性能的影响。结果表明:随着六氟异丙氧基引入量的增加,材料的耐油性有提升趋势,耐低温性能以及热稳定性能略有下降,但玻璃化转变温度均在-50℃以下,仍表现出优异的耐低温性能。硫化后的PTHOP样品具有优异的力学性能,拉伸强度最高达9.0MPa,断裂伸长率达到101%;同时耐油性能优异,在10号、15号液压油中150℃浸泡72h后体积变化率均在1%左右。
Fluorinated polyphosphazene elastomers (PTHOP) with different ratios of —OCH(CF3)2 side group were prepared by optimizing the substitution process.The effect of —OCH(CF3)2 introduction on the properties of fluorinated polyphosphazene elastomers was studied.The results showed that with the increase of —OCH(CF3)2 introduction,the oil resistance of the material tended to improve,but the low-temperature resistance and thermal stability of the material gradually decreased.However,the glass transition temperature was below -50℃,demonstrating excellent low-temperature resistance.The PTHOP samples after vulcanization had outstanding mechanical properties,with a maximum tensile strength of 9.0MPa and an elongation at break of 101%.At the same time,they had excellent oil resistance,with a volume change rate of about 1% after soaking at 150℃ for 72h in No.10 and No.15 hydraulic oil.
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基金资助
国家自然科学基金(51773010)
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