Studies on New Type of Phenolic Resin by Ring Opening Reaction of Benzoxazine (X) -Effect of Molecular Weight of Matrixon Properties of Glass Fiber Reinforced Composites

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  • ベンゾオキサジン環の開環反応を利用した新しいタイプのフェノール樹脂に関する研究(X)一ガラス繊維強化複合材料の物,性に及ぼすマトリックスの分子量の影響
  • ベンゾオキサジン環の開環反応を利用した新しいタイプのフェノール樹脂に関する研究(10)ガラス繊維強化複合材料の物性に及ぼすマトリックスの分子量の影響
  • ベンゾオキサジンカン ノ カイカン ハンノウ オ リヨウ シタ アタラシイ タイプ ノ フェノール ジュシ ニ カンスル ケンキュウ 10 ガラス センイ キョウカ フクゴウ ザイリョウ ノ ブッセイ ニ オヨボス マトリックス ノ ブンシリョウ ノ エイキョウ

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Two kinds of phenol-ovolac based benzoxazine having different molecular weights weresynthesized. Glass fiber reinforced plastic (GFRP) was prepared using the molten mixture fromthe above benzoxazines and bisoxazoline as a matrix, and the effect of molecular weight ofbenzoxazines on the properties of GFRP was investigated. As a result, GFRP from the benzoxazinehaving largermolecular weight as a matrix showed higher heat resistance because of highercrosslink density. And GFRP from the benzoxazine having lower molecular weight as a matrix showed higher tensile, flexural and especially impact strength. The reason was considered as follows: in the case of the benzoxazine having lower molecular weight as a matrix, matrix wasso flexible due to lower crosslink density, and interfacial bonding strength between matrix and fiber was so low that stress concentration in matrix was easy to relax.

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