New hyperbranched polyester modified DGEBA thermosets with improved chemical reworkability

被引：37

作者：

Foix, David ^{[1
]}

Erber, Michael ^{[2
]}

Voit, Brigitte ^{[2
]}

Lederer, Albena ^{[2
]}

Ramis, Xavier ^{[3
]}

Mantecon, Ana ^{[1
]}

Serra, Angels ^{[1
]}

机构：

[1] Univ Rovira & Virgili, Dept Analyt & Organ Chem, Tarragona 43007, Spain

[2] Leibniz Inst Polymer Res Dresden eV, D-01069 Dresden, Germany

[3] Univ Politecn Cataluna, ETSEIB, Thermodynam Lab, E-08028 Barcelona, Spain

来源：

POLYMER DEGRADATION AND STABILITY | 2010年 / 95卷 / 04期

关键词：

Epoxy resins; Hyperbranched polymers; Cationic polymerization; Reworkability; Shrinkage; CATIONIC COPOLYMERIZATION; DIGLYCIDYL ETHER; TERTIARY-AMINES; BISPHENOL-A; POLYMERS; DEGRADATION; POLYMERIZATION; SHRINKAGE; MIXTURES; NETWORKS;

D O I：

10.1016/j.polymdegradstab.2010.01.011

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 chemical reworkability of epoxy thermosets in alkaline solutions has been increased by adding a hyperbranched polyester (HBPE) as a reactive modifier to the diglycidyl ether of bisphenol A (DGEBA) cured by lanthanide triflates as cationic initiators. The presence of hydroxyl chain-ends in the HBPE allows the modifier to be linked covalently to the epoxy matrix through the monomer activated propagation mechanism, which occurs in cationic polymerizations. Yb(OTf)(3) leads to quicker curing than the lanthanum salt and to materials with the highest glass transition temperature (T-g). The addition of HBPE does not affect adversely the thermal stability and leads to a slight reduction of the global shrinkage. The T-g of the materials, the relaxed modulus and the linear thermal expansion coefficients are practically maintained by the addition of HBPE. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：445 / 452

页数：8

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