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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Oxirane Groups on Curing Behavior and Thermal Stability of Ester Resins
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Effect of Oxirane Groups on Curing Behavior and Thermal Stability of Ester Resins

机译：环氧乙烷基对酯类树脂固化行为和热稳定性的影响

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The effects of oxirane groups in vinyl ester(VE) resin and reactive diluent on curing characteristics and thermal behavior of cured resins are described.Stoichiometric(0.5:1,sample A) as well as nonstoichiometric (0.5:0.85, sample B) ratios for the diglycidyl ether of bisphenol-A(DGEBA)and methacrylic acid (MA) were used for the synthesis of VE resins .Resin sample B had more residual epoxy groups because f the stoichiometric imbalance of the reactants.VE resins thus obtained were diluted with methyl methacrylate(MMA;1:1,w/w),and controlled quantities of epoxy groups were introduced by partial replacement of MMA with glycidyl methacrylate (GMA) ,keeping the overall ratio of resin and reactive diluent constant.Increase of GMA content in resin A or B resulted in a decrease in gel time,indicating that the curing reaction is facilitated by the presence f epoxy groups.An increase in initiator content also reduced the gel time.In the differential scanning calorimetry (DSC) scans, a sharp curing exotherm was observed in the temperature range 107+-3150+-1 deg C .The onset temperature(T_(onset)) and peak exotherm temperature(T_(exo)) decreased with increase in GMA content .Heat of curing (#DELTA#H)als increased with increase in GMA content.A broad exotherm was observed after the initial sharp exotherm that was attributed t the etherification reaction .Cured VE resins were stable up to 250-260 deg C ,and started losing weight above this temperature .Rapid decomposition was observed in the temperature range 400-500 deg C
机译：描述了乙烯基酯（VE）树脂中的环氧乙烷基和反应性稀释剂对固化树脂的固化特性和热性能的影响。化学计量比（0.5：1，样品A）和非化学计量比（0.5：0.85，样品B）用双酚A的二缩水甘油醚（DGEBA）和甲基丙烯酸（MA）合成VE树脂。由于反应物的化学计量不平衡，树脂样品B具有更多的残留环氧基。所得的VE树脂用甲基稀释通过用甲基丙烯酸缩水甘油酯（GMA）部分取代MMA，引入甲基丙烯酸甲酯（MMA; 1：1，w / w）和可控制数量的环氧基，从而保持树脂的总比例和反应性稀释剂恒定。树脂中GMA含量的增加A或B缩短了凝胶时间，表明环氧基的存在促进了固化反应。引发剂含量的增加也缩短了凝胶时间。差示扫描量热法（DSC）扫描显示在107 + -3150 + -1摄氏度的温度范围内观察到放热现象。起始温度（T_（exset））和峰值放热温度（T_（exo））随着GMA含量的增加而降低。固化热（#DELTA #H）al随着GMA含量的增加而增加。最初的急剧放热归因于醚化反应后，观察到广泛放热。固化的VE树脂在250-260℃下稳定，并在此温度以上开始失重。在400-500摄氏度的温度范围内观察到快速分解

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