A novel all-purpose epoxy-terminated hyperbranched polyether sulphone toughener for an epoxy/amine system. (9th March 2015)

• Record Type: Journal Article
• Authors: Miao, Xuepei; Meng, Yan; Li, Xiaoyu
• Is Part Of: Polymer. Volume 60(2015)
• Page Start: 88
• Page End: 95
• Publication Date: 2015-03-09
• Subjects: Hybrid -- Polyether sulphone -- Fracture toughness; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2015.01.034
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: A new epoxide-terminated hyperbranched polyether sulphone (EHBPES) was synthesized using simple one-pot A2 +B3 approach. This highly effective toughener can toughen diglycidyl ether of bisphenol A/triethylenetetramine (DGEBA/TETA) curing system without forming phase-separated morphology. Effects of molecular weight (MW) and loading amounts on the mechanical and thermal properties of cure hybrids were investigated. The MW plays an important role in determining the crosslink density and defects of cured networks. Addition of medium-MW EHBPES-2 not only significantly improves toughness and elongation at break but also increases tensile strength and T g . At 5 wt% loading of EHBPES-2, the cured hybrid shows an elongation at break of 15.3%, impact strength of 50.9 kJ/m 2, and tensile strength of 80.0 MPa. The simultaneous improvements are explained by the higher crosslink density, increased nano-scale cavities, and the inhomogeneous structure of the cured network. Graphical abstract: Highlights: Epoxide-ended hyperbranched polyether sulphone of different Mn were synthesized. Effects of Mn and loading amount on toughness were studied. Notable increase in toughness is achieved without forming phase separation. Tg, elongation at break, and tensile strength reach maxima at ca. 5% loading.