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Degradation kinetics of functionalized novolac resins

机译:功能化酚醛清漆树脂的降解动力学

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摘要

We report the relationships between the degradation behaviors (i.e. the degradation kinetics, degradation activation energy, weight loss conversion, and char formation) and the structure features in three modified novolac resins bearing different curable functional groups and aromatic units i.e. Carbonyl phenyl azo novolac resin (CPAN), 4-(4-hydroxyphenyl azo) benzyl ester novolac resin (HPDEN) and Carbonyl phenyl 4-(4-hydroxyphenyl azo) benzyl ester novolac resin (CHABN). These modifications enhanced the thermal stability of the cured novolac resins by delaying the decomposition temperature up to 30-100 ℃ and produced prominent residue char yield up to 68% (CPAN), 56% (HPDEN) and 64% (CHABN), respectively. The two heavily cross-linked samples, CPAN and CHABN displayed even higher Ea than HPDEN. All modified novolacs displayed much higher decomposition activation energy (over 237 KJ/ mol~*K) compared with the generic phenolic (PN).
机译:我们报告了降解行为(即降解动力学,降解活化能,失重转化和炭形成)与三种具有不同可固化官能团和芳族单元的改性酚醛清漆树脂之间的结构特征之间的关系,即羰基苯基偶氮酚醛清漆树脂( CPAN),4-(4-羟基苯基偶氮)苄酯酚醛清漆树脂(HPDEN)和羰基苯基4-(4-羟基苯基偶氮)苄酯酚醛清漆树脂(CHABN)。这些改性通过将分解温度延迟至30-100℃而提高了固化型线型酚醛树脂的热稳定性,并显着提高了残渣炭收率,分别高达68%(CPAN),56%(HPDEN)和64%(CHABN)。两个高度交联的样品CPAN和CHABN的Ea甚至比HPDEN高。与普通酚醛(PN)相比,所有改性酚醛清漆均显示出更高的分解活化能(超过237 KJ / mol·* K)。

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