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首页> 外文期刊>Polimery >Effects of chemical and supermolecular structures on mechanical properties of polyurethane/unsaturated polyester compositions of interpenetrating polymer networks types
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Effects of chemical and supermolecular structures on mechanical properties of polyurethane/unsaturated polyester compositions of interpenetrating polymer networks types

机译：化学和超分子结构对互穿聚合物网络类型聚氨酯/不饱和聚酯组合物力学性能的影响

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The compositions being interpenetrating polymer networks of IPN type have been made of unsaturated polyester resin(UP resin,4 grades),polyurethane(PUR)and styrene(ST)-Table 1 and 2.Mathematical model,describing an influence of chemical composition on selected mechanical properties of synthesized IPN systems,was elaborated [equation(1),Table 5].The following properties have been taken into consideration:stress at break-1/3,unit elongation at break-j2,impact strength-1/3,hardness-1/4(Table 3 and 4).The model was used to calculate the area of optimum composition(Fig.1,Table 6 and 7)in which the compromise in values of basic mechanical properties could be reached(Table 7,Fig.4).Morphologies of the surfaces of IPN systems,differing in crosslinking density and chemical composition,were studied using SEM method(Fig.10 and 11).It was found that all of the samples of compositions from the area of optimum composition show heterogeneous structures.The matrix is built of UP resin while dispersed phase consists of the mixture of UP resin and PUR.The morphology observed is a result of two competing processes of phase separation and polymerization reaction going simultaneously at the stage of UP resin curing with ST.In order to confirm this idea the kinetics of gelation of IPN compositions was investigated and gelation time(t_(gel.))as well as maximum temperature of curing reaction(T_(maks)were determined(Table 8,Fig.5-7).It was found that fast gelation of IPN systems led to formation of homogeneous matrix built of UP resin(compromised mechanical properties were observed)while slow gelation process favored the formation of heterogeneous matrix,built of UP resin and PUR.
机译：IPN型互穿聚合物网络的组成由不饱和聚酯树脂（UP树脂，4级），聚氨酯（PUR）和苯乙烯（ST）制成-表1和表2。详细说明了合成IPN系统的力学性能[等式（1），表5]。已考虑以下特性：断裂应力1/3，断裂单元伸长率j2，冲击强度1/3 ，硬度-1/4（表3和4）。该模型用于计算最佳组成区域（图1，表6和7），在该区域中可以达到基本力学性能值的折衷（表7） ，图4）。使用SEM方法研究了IPN系统表面的形貌，交联密度和化学组成的差异（图10和11）。从最佳区域发现所有组成样品组成显示异质结构。基体由UP树脂分散而成相是由UP树脂和PUR的混合物组成的。观察到的形态是在UP树脂与ST固化阶段同时发生的两个相分离和聚合反应竞争过程的结果。研究了IPN的组成，确定了凝胶化时间（t_（gel。））和固化反应的最高温度（T_（mak））（表8，图5-7）。发现IPN系统的快速凝胶化导致形成了由UP树脂组成的均质基体（观察到机械性能受损），而缓慢的凝胶化过程有利于由UP树脂和PUR组成的异质基体的形成。

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