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首页> 外文期刊>Journal of Applied Polymer Science >Condensation-Addition-Type Resole Resins with Phenyl Ethynyl Functions: Synthesis, Characterization, and Thermal Properties
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Condensation-Addition-Type Resole Resins with Phenyl Ethynyl Functions: Synthesis, Characterization, and Thermal Properties

机译：具有苯基乙炔基官能团的缩合型甲阶树脂：合成，表征和热性质

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摘要

Novel phenolic resins bearing methylol and phenyl ethynyl functions and curing by both condensation and addition mechanisms were synthesized by the reaction of 3-(phenyl ethynyl) phenol(PEP) with formaldehyde under alkaline conditions. Resins with varying relative concentration of the two functional groups were synthesized and characterized. The resins underwent a two-stage cure, confirmed by both DSC and DMA analyses. The low-temperature cure due to methylol condensation led to early gelation of the system. The ultimate curing through addition reaction of phenylethynyl group required heating at 275deg C. The cured resins exhibited better thermal stability and anaerobic char yield in comparison to a conventional resole. The thermal stability and char-yielding property showed a diminishing trend with enhanced methylol substitution. Resin with F/P ration less than unity offered excellent thermal stability and anaerobic char yield. The thermal degradation of the cured resins occurred in two kinetic steps. Methylene groups favored the initial degradation, whereas the higher temperature carbonization process was independent of the network structure.
机译：通过使3-（苯基乙炔基）苯酚（PEP）与甲醛在碱性条件下反应，合成了具有羟甲基和苯基乙炔基功能并通过缩合和加成机理固化的新型酚醛树脂。合成并表征了两个官能团相对浓度不同的树脂。通过DSC和DMA分析证实，树脂经历了两阶段固化。由于羟甲基缩合引起的低温固化导致体系早期胶凝。通过苯基乙炔基的加成反应的最终固化需要在275°C下加热。与常规甲阶酚醛树脂相比，固化后的树脂表现出更好的热稳定性和厌氧炭产率。随着羟甲基取代度的提高，热稳定性和炭化性能呈下降趋势。 F / P比小于1的树脂具有出色的热稳定性和厌氧焦炭产量。固化树脂的热降解发生在两个动力学步骤中。亚甲基基团有利于初始降解，而高温碳化过程与网络结构无关。

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