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首页> 外文期刊>Journal of Materials Science >Thermal and dynamic mechanical properties of IPNS formed from unsaturated polyester resin and epoxy polyester
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Thermal and dynamic mechanical properties of IPNS formed from unsaturated polyester resin and epoxy polyester

机译：由不饱和聚酯树脂和环氧聚酯形成的IPNS的热力学和动态力学性能

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摘要

The interpenetrating polymer networks (IPNs) were formed by unsaturated polyester resin (UPR) polymerized by free radical initiators: benzoyl peroxide (BPO) or cumene hydroperoxide (CHP) and epoxy polyester (EP), cured with acid anhydrides: tetrahydrophthalic anhydride (THPA) or maleic anhydride (MA). IPNs consisting 10, 30, 50, 70, 90 wt% of EP were prepared. The effect of the EP component in the IPNs and the type of curing agent on the cure behavior, thermal, and viscoelastic properties have been investigated. The results showed that both EP content and used curing system influenced on studied properties. As the EP content increased, the glass transition temperatures (T g) also increased. Moreover, higher values of tanδmax and lower values of cross-linking density in a rubbery state (νe) of IPNs containing higher EP content, probably due to plasticization effect of EP component were observed. Additionally, more heterogeneous network structure (higher values of the full-width at half-maximum (FWHM) as the EP content decreased was prepared. The thermal and viscoelastic properties of the blends cured with BPO/MA or CHP/MA system were considerably better than those cured with BPO/THPA or CHP/THPA. The higher stiffness, νe, T g and lower tanδmax values were obtained. It was probably connected with the interactions of carbon–carbon double bonds of MA with vinyl monomer (styrene), UPR and radical initiators causing to obtain more cross-linked polymer network structure. This supposition was confirmed on basis of the cure reaction monitored by DSC. The chemical interactions between two components of the blends and epoxy hardener caused that the BPO/MA or CHP/MA cure systems influenced on the cure behavior of UPR and EP components in the IPNs. The exotherm peak temperature (T max1) shifted to lower values compared to these in the neat UPR whilst T max2 shifted to higher values than in the neat EP. However, the cure behavior of the UPR was not greatly affected by the presence of EP component when BPO/THPA or CHP/THPA cure systems were used due to the lack of chemical interactions between the components and their curatives.
机译：互穿聚合物网络（IPNs）由不饱和聚酯树脂（UPR）与自由基引发剂：过氧化苯甲酰（BPO）或异丙基氢过氧化氢（CHP）和环氧聚酯（EP）聚合而成，并用酸酐固化：四氢邻苯二甲酸酐（THPA）或马来酸酐（MA）。制备包含10、30、50、70、90重量％EP的IPN。已经研究了IPN中EP组分和固化剂类型对固化行为，热和粘弹性的影响。结果表明，EP含量和使用的固化体系都会影响所研究的性能。随着EP含量的增加，玻璃化转变温度（T g ）也增加。此外，含较高EP含量的IPN的橡胶态（tanδ sub ）的tanδ max 值较高，而交联密度较低（ν e ）观察到EP成分。此外，还制备了更多的异质网络结构（随着EP含量的降低，半峰全宽（FWHM）值更高），用BPO / MA或CHP / MA体系固化的共混物的热和粘弹性性能明显更好。与用BPO / THPA或CHP / THPA固化的相比，可以获得更高的刚度，ν e ，T g 和更低的tanδ max 值。它可能与MA与乙烯基单体（苯乙烯），UPR和自由基引发剂的碳-碳双键的相互作用有关，从而获得了更多的交联聚合物网络结构，这一假设在DSC监测的固化反应的基础上得到了证实。 。共混物的两种组分与环氧固化剂之间的化学相互作用导致BPO / MA或CHP / MA固化体系影响IPN中UPR和EP组分的固化行为。放热峰温度（T max1 < / sub>）移到较低的值，相比于纯净的UPR w T max2 移到比纯净EP更高的值。但是，当使用BPO / THPA或CHP / THPA固化体系时，EP组分的存在对UPR的固化行为影响不大，原因是组分与固化剂之间缺乏化学相互作用。

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