Citation: Hong-jun Guo, Xue Wang, Li-shuai Zong, Jian-fang Li, Jin-yan Wang, Gui-yang Li, Xi-gao Jian. Reactive Toughening Modification of 601 Epoxy Resin Using Poly(phthalazinone ether sulfone)s Bearing Pendant Carboxyl Groups[J]. Acta Polymerica Sinica, ;2018, 0(9): 1236-1243. doi: 10.11777/j.issn1000-3304.2017.17286 shu

Reactive Toughening Modification of 601 Epoxy Resin Using Poly(phthalazinone ether sulfone)s Bearing Pendant Carboxyl Groups

1.
Aerospace Research Institute of Materials and Processing Technology, Beijing 100076
2.
Department of Polymer Science & Materials, Dalian University of Technology, Dalian 116024

Corresponding author: Jin-yan Wang, wangjinyan@dlut.edu.cn Gui-yang Li, guiyang_lee@outlook.com
Received Date: 16 October 2017
Revised Date: 18 November 2017
Available Online: 16 April 2018

A series of poly(aryl ether sulfonephthalazinone)s (PPES-Ps) containing pendent carboxyl groups and N-heterocyclicphthalazinone units were derived from phenolphthalin (PPL) and 4-(3-chloro-4-hydroxylphenyl)(2H)-phthalazin-1-one (DHPZ) with 4,4′-dichlorodiphenyl sulfone (DCS) via " one-pot” solution polymerization. The structure of the resulting polymers was elaborately controlled by tailoring the feed ratio of the two diphenols to have a balance between the carboxyl content and the thermal resistance. As evidenced by NMR analysis, the structure of the corrsponding polymers along with the carboxyl content is consistent with those designed. PPES-Ps also exhibit high glass transition temperature (T_g > 260 °C) and excellent thermal stability as well as good solubility, mainly originating from the rigid, bulky, non-coplanar phthalazinone units. As the content of phthalazinone unit increases, both T_g and solubility demostrate an increasing trend. Furthermore, the copolymers with different contents of carboxyl groups are used to reactively toughen 601 epoxy resin. The mechanical and thermal properties of the obtained blending system are investigated in details. The results indicate that the pendant carboxyl groups in PPES-P can efficiently react with the epoxy groups of 601 resin during the thermal curing, leading to cross-linking networks by covalent bonding, which can not only improve the fracture toughness and flexural properties, but also maintain the high T_g of 601 epoxy resin. The impact strength of 601 epoxy resin, reactively toughened by PPES-P13 derived from PPL/DHPZ with the molar ratio of 1:3, is 43% higher than that of unmodified 601 resin. Meanwhile, the fracture of impact specimen shows a toughened fracture character, and no phase separation is observed on the crack surface, even with a high concent (15%) of PPES-P, which means that the reactive carboxyl moiety could enhance the compatibility between the high rigid poly(aryl ether)s and the epoxy resins. The 601 resins, reactively modified with PPES-Ps toughening, are thus expected to be useful in multistage toughening of carbon fiber reinforced resin matrix composites.
- Reactive toughening modification,
- 601 Epoxy resin,
- Poly(aryl ether sulfone)s,
- Thermal properties
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沈阳化工大学材料科学与工程学院沈阳 110142