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首页> 外文学位 >Experimental studies on: I. Elastomers swollen with liquid crystalline diluents. II. Elastomers reinforced with fillers. III. Effect of crosslinking in solution on strain-induced crystallization.
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Experimental studies on: I. Elastomers swollen with liquid crystalline diluents. II. Elastomers reinforced with fillers. III. Effect of crosslinking in solution on strain-induced crystallization.

机译：实验研究：I.用液晶稀释剂溶胀的弹性体。二。用填料增强的弹性体。三，溶液中交联对应变诱导结晶的影响。

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The unique properties of liquid crystals (L.C.) continue to find application in an ever-increasing number of diverse fields, such as liquid crystal electro-optic display devices, in analytical chemistry as substrates for gas chromatography, and as L.C. based commercial fibers of high tensile strength, in particular nematic isotropic solution of poly (p-bezamide). Liquid crystals in general allow the nondestructive thermal analysis of everything from aircraft structures to electronic components and so on.; Chapter I investigates the mechanical, optical and thermal behavior of basically two types of elastomers, namely, polyphosphazene and poly(dimethylsiloxane) PDMS. The aim was to look for the effect of diluents on the above mentioned elastomers when their isotropy phase is perturbed via strain, and what this anisotropy, or orientation contributes to both optical and mechanical properties. These studies were made, and are represented by the results obtained from the mechanical and optical behavior of these elastomers after they are swollen with these diluents.; Chapter II and III deal with the experimental investigation of the mechanical properties of poly(ethylacrylate) networks reinforced with silica (SiO{dollar}sb2{dollar}) during emulsion polymerization, and poly(dimethylsiloxane) reinforced with zeolite fillers, respectively.; Chapter IV covers experimental studies which were performed to determine the effect that cross-linking a network in solution has on its strain-induced crystallization. A series of networks were cross-linked in the presence of different amounts of solvent to try to diminish the number density of entanglements, and hence to affect the strain-induced crystallization. The results were represented again by the mechanical properties and the volume fraction of the polymers with respect to the value of elongation at which the polymer tends to deviate from rubberlike elasticity theory as a result of the crystallites formed when these polymers are stretched.; These crystallites act as physical cross-links and hence, at a certain stage of elongation, contribute to the modulus of the polymers. This is an internal reinforcement that many other polymers do not exhibit. The results did not show significant effect of the presence of the solvent over this phenomena. (Abstract shortened with permission of author.)
机译：液晶（L.C.）的独特性质继续在越来越多的不同领域中找到应用，例如液晶电光显示设备，分析化学中用作气相色谱的底物以及L.C.基的高拉伸强度的商用纤维，特别是聚对苯甲酰胺的向列各向同性溶液。通常，液晶可以对从飞机结构到电子元件等所有事物进行无损热分析。第一章主要研究了两种弹性体的机械，光学和热性能，即聚磷腈和聚二甲基硅氧烷PDMS。目的是寻找当稀释剂的各向同性相因应变而受到扰动时，稀释剂对上述弹性体的影响，以及这种各向异性或取向对光学和机械性能的贡献。进行了这些研究，并由这些弹性体在稀释剂中溶胀后的机械和光学性能得到了结果。第二章和第三章分别是在乳液聚合过程中用二氧化硅（SiO {dollar} sb2 {dollar}）增强聚（丙烯酸）乙酯和用沸石填料增强的聚（二甲基硅氧烷）的力学性能的实验研究。第四章涵盖了实验研究，旨在确定溶液中网络的交联对其应变诱导结晶的影响。在不同数量的溶剂存在下将一系列网络交联，以试图减少纠缠的数密度，从而影响应变诱导的结晶。该结果再次由相对于伸长率值的聚合物的机械性能和体积分数表示，由于当这些聚合物被拉伸时形成的微晶，该聚合物倾向于偏离橡胶样弹性理论。这些微晶起到物理交联的作用，因此在伸长的某个阶段有助于聚合物的模量。这是许多其他聚合物没有表现出的内部增强作用。结果没有显示出溶剂的存在对该现象的显着影响。 （摘要经作者许可缩短。）

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