The Effect of Urea Bond on Structure and Properties of Toughened Epoxy Resins

被引：5
作者：
Fang, Jianglin [1 ,2 ]
Luo, Ruilin [3 ]
He, Peng [1 ]
Quan, Yiwu [1 ]
Chen, Qingmin [1 ]
机构：
[1] Nanjing Univ, Sch Chem & Chem Engn, Dept Polymer Sci & Engn, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Ctr Modern Anal, Nanjing 210093, Peoples R China
[3] Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 2010年 / 118卷 / 04期
关键词：
epoxy resin; toughness; urea; modification; MECHANICAL-PROPERTIES; DIELECTRIC ANALYSIS; CURE KINETICS; AMINE; BEHAVIOR; BLENDS;
D O I：
10.1002/app.32594
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
In this article, modified poly(oxypropylene) diamines were synthesized and used as a new flexible curing agent for epoxy resins. The purpose of modification is to introduce urea group into epoxy resins. The reaction rate, mechanical properties, glass transition temperature (T-g), and fracture surface morphology of these toughened epoxy resins were investigated. Because of urea groups, the reactivity between poly(oxypropylene) diamines and epoxy resins was significantly enhanced. At the same time, the urea groups resulted in strong intersegmental hydrogen bonding between modified poly(oxypropylene) chain, which reduced the compatibility of poly(oxypropylene) with epoxy resins and resulted in higher T-g of toughened epoxy. The modified sample had tensile strength of 15.8 MPa and ultimate elongation of 118% at room temperature, whereas the unmodified sample only had 6.2 MPa and 70%. The scanning electron microscope analysis showed that the modified system displayed tough fracture feature, whereas the unmodified system showed typical brittle fracture. (C) 2010 Wiley Periodicals, Inc.J Appl Polym Sci 118: 2195-2201, 2010
引用
收藏
页码：2195 / 2201
页数：7
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