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首页> 外文期刊>Journal of Applied Polymer Science >Epoxidized natural rubber/epoxy blends: Phase morphology and thermomechanical properties
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Epoxidized natural rubber/epoxy blends: Phase morphology and thermomechanical properties

机译：环氧天然橡胶/环氧共混物：相形态和热机械性能

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摘要

Epoxidized natural rubbers (ENRs) were prepared. ENRs with different concentrations of up to 20 wt % were used as modifiers for epoxy resin. The epoxy monomer was cured with nadic methyl anhydride as a hardener in the presence of N,N-dimethyl benzyl amine as an accelerator. The addition of ENR to an anhydride hardener/epoxy monomer mixture gave rise to the formation of a phase-separated structure consisting of rubber domains dispersed in the epoxy-rich phase. The particle size increased with increasing ENR content. The phase separation was investigated by scanning electron microscopy and dynamic mechanical analysis. The viscoelastic behavior of the liquid-rubber-modified epoxy resin was also evaluated with dynamic mechanical analysis. The storage moduli, loss moduli, and tan δ values were determined for the blends of the epoxy resin with ENR. The effect of the addition of rubber on the glass-transition temperature of the epoxy matrix was followed. The thermal stability of the ENR-modified epoxy resin was studied with thermogravimetric analysis. Parameters such as the onset of degradation, maximum degradation temperature, and final degradation were not affected by the addition of ENR. The mechanical properties of the liquid-natural-rubber-modified epoxy resin were measured in terms of the fracture toughness and impact strength. The maximum impact strength and fracture toughness were observed with 10 wt % ENR modified epoxy blends. Various toughening mechanisms responsible for the enhancement in toughness of the diglycidyl ether of the bisphenol A/ENR blends were investigated.
机译：制备了环氧天然橡胶（ENR）。最高20 wt％的不同浓度的ENR被用作环氧树脂的改性剂。在N，N-二甲基苄基胺作为促进剂的存在下，用萘甲酸酐作为硬化剂固化环氧单体。将ENR添加到酸酐硬化剂/环氧树脂单体混合物中导致形成由分散在富环氧相中的橡胶域组成的相分离结构。颗粒尺寸随ENR含量的增加而增加。通过扫描电子显微镜和动态力学分析研究相分离。还通过动态力学分析评估了液态橡胶改性环氧树脂的粘弹性行为。确定环氧树脂与ENR的共混物的储能模量，损耗模量和tanδ值。跟踪添加橡胶对环氧基质的玻璃化转变温度的影响。用热重分析法研究了ENR改性环氧树脂的热稳定性。添加ENR不会影响降解开始，最高降解温度和最终降解等参数。液体天然橡胶改性环氧树脂的机械性能根据断裂韧性和冲击强度进行测量。用10重量％的ENR改性的环氧共混物观察到最大的冲击强度和断裂韧性。研究了增加双酚A / ENR共混物的二缩水甘油醚韧性的各种增韧机理。

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