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首页> 外文期刊>Journal of Applied Polymer Science >Influence of Vinyl Ester/Styrene Network Structure on Thermal and Mechanical Behavior
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Influence of Vinyl Ester/Styrene Network Structure on Thermal and Mechanical Behavior

机译：乙烯基酯/苯乙烯网络结构对热力学行为的影响

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摘要

The influence ofviriylestf'.r/styrene network structure on thermal and me- chanical properties was investigated. The crosslink density of the resins was altered by changing the molecular weightoftli~ Vinyl ester oligomer and by varying the amount of styrene used during the crosslinking reaction leading to variations in both the physical network structure and the chemical composition of the polymeric networks. The glass transition temperatures of the network polymers were found to increase systE;matically with increasing crosslink density without the additional influence of the chemical compo- sition as determined from both differential sc~ calorimetry (DSC) and dynamic mechanical analysis (DMA). The breadth of the glass transition regions increased with crosslink density for the DSCdata, but the breadth assessed from the DMA data did not vary significantly for thehetwork materials. A seconcJary relaxation was observeQ for the materials using DMA, and this relaxation did not appear to be significantly affected by changes in either the crosslink density or the composition of the network. Cooperativity studies involving time-temperature sCaling of dynamic mechanical data in the glass formation temperature region were also conducted. The degree of segmental cooperativity at T 9 appeared to be primarily influenced by the chemical composition of the networks. These issues dealing with the structure of the networks provided irisight into the associated fracture properties in the glassy state (ambient temperature). Specifically, an empirically based linear correlation was found between the fracture toughness of the networks and the cooperative domain size at the glass transition temperature normalized by the crosslink density.
机译：研究了virestylestf'.r /苯乙烯网络结构对热和机械性能的影响。通过改变乙烯基酯低聚物的分子量和通过改变在交联反应期间使用的苯乙烯的量来改变树脂的交联密度，从而导致聚合物网络的物理网络结构和化学组成的变化。发现网络聚合物的玻璃化转变温度在体系上增加;随着交联密度的增加，在没有附加化学差示量热法（DSC）和动态力学分析（DMA）的化学成分影响的情况下，系统地增加。对于DSC数据，玻璃化转变区域的宽度随着交联密度的增加而增加，但是对于热加工材料，根据DMA数据评估的宽度没有显着变化。对于使用DMA的材料，观察到了二次松弛，并且这种松弛似乎不受交联密度或网络组成变化的显着影响。还进行了涉及在玻璃形成温度区域内动态力学数据的时间-温度标度的合作研究。 T 9处的段合作度似乎主要受网络化学组成的影响。这些与网络结构有关的问题为玻璃态（环境温度）下的相关断裂特性提供了清晰的信息。具体而言，发现在基于交联密度归一化的玻璃化转变温度下，网络的断裂韧性与协同作用域尺寸之间存在基于经验的线性相关性。

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