Preparation and Properties of Ethynylphenyl Terminated Telechelic Poly (Imide-Siloxane)
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摘要: 利用4，4'-二胺二苯甲烷（MDA）、4，4'-二胺二苯醚（ODA）和3，4'-ODA 3种芳香族二胺与端氨基聚硅氧烷组成混合二胺，再与含氟芳香二酐缩聚，经间氨基苯乙炔封端制备了3种乙炔基苯基封端遥爪型聚（酰亚胺-硅氧烷）（ATIS）树脂，研究了不同ATIS树脂的结构、加工性能、固化行为、热稳定性以及聚四氟乙烯（PTFE）纤维布增强ATIS复合材料的摩擦性能。结果表明：所制备ATIS树脂在有机非质子极性溶剂中均表现出优良的溶解特性，加工窗口为40~60℃，固化放热焓都不超过250 J·g-1，含3，4'-ODA ATIS树脂的加工窗口最宽，含4，4'-ODA ATIS树脂的固化放热焓最低；在氮气中固化的树脂在800℃时质量残留率在30%左右；摩擦初期PTFE/ATIS复合材料的摩擦因数较大，30 min后降低至0.15以下，在30~240 min内保持稳定，90 min后含MDA复合材料的摩擦因数大于含ODA复合材料。
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关键词:
- 聚(酰亚胺-硅氧烷) /
- 乙炔基苯基封端 /
- 加工性能 /
- 热稳定性
Abstract: 4,4'-diaminodiphenylmethane (DMA), 4,4'-diaminodiphenyl ether (ODA) and 3,4'-ODA aromatic diamine were mixed with the amino-end capped polysiloxane to polymerize with fluorine-contained aromatic dianhydride, which was terminated with 3-ethynyl aniline to obtain three telechelic ethynylphenyl terminated poly(imide-siloxane) (ATIS) resins. The structure, processability, curing behavior, thermal stability of different ATIS resins and friction properties of PTFE fiber cloth reinforced ATIS composites were studied. The results show that the prepared ATIS resins had good solubility in aprotic polar solvents with processing window of 40-60℃ and curing exothermal enthalpy lower than 250 J·g-1; ATIS resin with 3,4'-ODA had the widest processing window, and ATIS resin with 4,4'-ODA had the lowest curing exothermal enthalpy. The mass residual yield at 800℃ of cured resin in N2 was about 30%. The friction coefficient of PTFE/ATIS composites was relatively high in the initial wear stage, and dropped to below 0.15 in 30 min, and kept stable in 30-240 min; the friction coefficient of composite with MDA was higher than that of composites with ODA after 90 min.-
Keywords:
- poly(imide-siloxane) /
- ethylphenyl termination /
- processability /
- thermostability
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