Molecular origin of unusual physical and mechanical properties in novel phenolic materials based on benzoxazine chemistry

被引：0

作者：

Wirasate, S

Dhumrongvaraporn, S

Allen, DJ

Ishida, H ^{[1
]}

机构：

[1] Case Western Reserve Univ, Dept Macromol Sci, NSF Ctr Mol & Microstruct Composites, Cleveland, OH 44106 USA

[2] Chulalongkorn Univ, Petr & Petrochem Coll, Bangkok 10330, Thailand

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 1998年 / 70卷 / 07期

关键词：

polybenzoxazine; phenolic resin; hydrogen bonding; infrared spectroscopy;

D O I：

10.1002/(SICI)1097-4628(19981114)70:7<1299::AID-APP6>3.3.CO;2-B

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

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.

引用

页码：1299 / 1306

页数：8

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