Toughening of High Performance Epoxy Matrix Resin by Modification with Multi-block Copolymers Composed of Poly (<I>N</I>-phenylmaleimide-<I>alt</I>-styrene) and Polydimethylsiloxane or Polyoxyethylene
スポンサーリンク
概要
- 論文の詳細を見る
Multi-block copolymers composed of poly (<I>N</I>-phenylmaleimide-<I>alt</I>-styrene) and flexible segments such as polydimethylsiloxane or polyoxyethylene were prepared by copolymerization of <I>N</I>-phenylmaleimide and styrene with macromolecular azo-initiators containing polydimethylsiloxane or polyoxyethylene segments, and used for the modification of high performance epoxy resin, which is a mixture of <I>N</I>,<I>N</I>, <I>N</I>', <I>N</I>'-tetraglycidyldiaminodiphenylmethane, dicyclopentadienyl-type epoxy resin, naphthalene-type epoxy resin and bisphenol-A diglycidyl ether, cured with 4, 4' -diaminodiphenyl sulfone. The fracture toughness (K<SUB>IC</SUB>) and flexural strength of the modified resin were strongly dependent on both the molecular weight (M<SUB>w</SUB>) and structure (composition) of the modifier, while the modulus and glass transition temperature of the modified resin were maintained in this modification system. The addition of 5 phr of poly [poly (<I>N</I>-phenylmaleimide-<I>alt</I>-styrene) -<I>block</I>-polydimethylsiloxane] (PMSZ) having low M<SUB>w</SUB> (157,000) and high dimethylsiloxane (VPS) content (40 mol%), or high M<SUB>w</SUB> (664,000) and low VPS content (11 mol%) brought about increases (ca. 70%) in K<SUB>IC</SUB> of the modified resin without large loss of flexural strength, compared with the control resin. The addition of 12-15 phr of poly [poly (<I>N</I>-phenylmaleimide-<I>alt</I>-styrene) -<I>block</I>-polyoxyethylene] (PMSE : M<SUB>w</SUB>, 300,000, oxyethylene content 35mol%) resulted in the largely increased K<SUB>IC</SUB> (210%) with rather large loss of flexural strength. PMSE was more effective for toughening of the epoxy matrix resin compared with corresponding PMSZ (M<SUB>w</SUB> 371,000, VPS content 30 mol%) or poly (<I>N</I>-phenylmaleimide-<I>alt</I>-styrene) (PMS : M<SUB>w</SUB> 397,000) without flexible segments. It was concluded that this is due to the high compatibility of polyoxyethylene segments in PMSE with the matrix resin. These modified resins with high K<SUB>IC</SUB> had the co-continuous-phase morphology. The toughening mechanism was discussed in terms of the morphological and dynamic viscoelastic behaviors of the modified epoxy resin system.
- Japan Thermosetting Plastics Industry Associationの論文
Japan Thermosetting Plastics Industry Association | 論文
- 23 注型ポリウレタン底スクラツプのPVCブレンド底への再利用について
- 8 シアノグアニジンとホルムアルデヒドとの反応:(その5) 強酸性条件下での反応
- CTBN1300X8/エポキシ樹脂変性時の触媒効果と反応形態
- CTBN1300×9系ゴム変性エポキシ樹脂の性質
- 6. 尿素メラミン樹脂液中のホルマリン定量法に関する考察