蒙特納石/環氧樹脂奈米複合材料之反應動力學與性質

Abstract

本研究利用已酸化不同種類的有機單體或預聚合物與Na+-蒙特納石(Na-montmonrillonite)進行陽離子交換反應形成有機蒙特納石(organo montmonrillonite)，針對有機單體的選擇包括12-aminocarboxylic acids（12COOH）、p-phenylenediamine（PPD）、4,4’-Diaminodiphenyl sulfone（DDS）、4,4’-Diaminodiphenyl sulfide（ASD）和α,ω-Amino-organofunctional Polydiethylsiloxane（SI）等研究有機蒙特納石極性、層間距，與環氧樹脂的硬化反應，基本物性和熱性質，同時探討不同功能的有機蒙特納石對有機蒙特納石/環氧樹脂奈米複合材料物性之影響。 以熱分析對環氧樹脂硬化反應的動力學研究，可得到有機蒙特納石的反應活性、反應活化能等均深受膨潤劑種類與Na+-蒙特納石陽離子取代率、層間距離及環氧樹脂與有機蒙特石的膨潤量所共同決定，而硬化反應的活化能會隨著添加有機蒙特納石的量的增加而降低，最大可達21﹪；而隨著有機蒙特納石的添加，可增快反應速率，縮短反應時間。 添加5wt%有機蒙特納石的奈米複合材料，其玻璃轉換溫度和未添加有機蒙特納石純的環氧樹脂/硬化劑組成相比較，最大可增加24℃；在機械性質方面，抗張強度的楊氏模數可提昇44﹪以上，而抗曲強度的楊氏模數則可提昇36以上。

This study involved the reaction of swelling-agent-modified montmorillonite in the curing reaction of Epoxy and the exfoliated Montmorillonite/Epoxy nanocomposites. This thesis involved a study of the curing reaction kinetics of swelling-agent-modified montmorillonite in Epoxy and a characterization of the thermal and mechanical properties of exfoliated montmorillonite/Epoxy nanocomposites. The exfoliated structure of MMT/Epoxy were confirmed by WAXD and TEM studies. The swelling agents used included 12-aminocarboxylic acids（12COOH）、p-phenylenediamine（PPD）、4,4’-Diaminodiphenyl sulfone（DDS）、4,4’-Diaminodiphenyl sulfide（ASD） andα,ω-Amino-organofunctional Polydiethylsiloxane（SI）. It was found that the activation energy of the curing reaction of the curing reaction of Epoxy decrease with the increasing amount of ASD-MMT with a maximum reduction of 21﹪. The glass transition temperature of 5/95 Montmorillonite/Epoxy increased 24℃ as compared to that of pure Epoxy cured by 4,4’-Diaminodiphenyl sulfone（DDS）. The Young’s modulus and the flexural modulus of 5/95 Montmorillonite /Epoxy were 44﹪and 36﹪higher than that of pure Epoxy cured by DDS.