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首页> 外文期刊>Journal of Applied Polymer Science >Molecular origin of unusual physical and mechanical properties in novel phenolic materials based on benzoxazine chemistry
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Molecular origin of unusual physical and mechanical properties in novel phenolic materials based on benzoxazine chemistry

机译：基于苯并恶嗪化学的新型酚类材料异常物理和机械性质的分子起源

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The effect of temperature on hydrogen bonding was investigated by measuring the integrated infrared absorbance of various hydrogen-bonding modes as a function of temperature. It was found that conformationally preferred hydrogen-bonding modes maintain constant intensities over the wide temperature ranges studied for both polybenzoxazines and a novolac-type phenolic resin. In particular, the O- - -H- - -N hydrogen bond shows strong bonding that does not change over the temperature range. On the other hand, statistically distributed hydrogen bonding is more sensitive to the temperature change and its infrared intensities start decreasing around the beta-transition of polybenzoxazines. The unusual physical and mechanical properties of polybenzoxazines, including volumetric expansion upon polymerization, high moduli, and high glass transition temperatures, are explained based on the complex hydrogen bonding. (C) 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 1299-1306, 1998. [References: 16]
机译：通过测量各种氢键合模式的积分红外吸收率随温度的变化，研究了温度对氢键合的影响。已经发现，对于聚苯并恶嗪和酚醛清漆型酚醛树脂，构象上优选的氢键合模式在宽温度范围内保持恒定的强度。特别是，O---H---N氢键显示出在温度范围内不发生变化的强键。另一方面，统计分布的氢键对温度变化更为敏感，并且其红外强度在聚苯并恶嗪的β-跃迁附近开始下降。基于复杂的氢键解释了聚苯并恶嗪的不同寻常的物理和机械性能，包括聚合时的体积膨胀，高模量和高玻璃化转变温度。 （C）1998 John Wiley＆Sons，Inc. J Appl Polym Sci 70：1299-1306，1998。[参考：16]

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