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標題: | 梳狀環氧樹脂合成設計與應用 Facile Synthesis toward Comb-like Epoxy-Based Polymers : Structural Design and Applications |
作者: | 賴泰宏 Tai-Hong Lai |
指導教授: | 鄭如忠 Ru-Jong Jeng |
關鍵字: | 梳狀結構,化學改質,玻璃轉化溫度,水性環氧樹脂,抗腐蝕性, comb-like structure,chemically modified,glass transition temperature,waterborne epoxy resins,corrosion resistance, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 本研究藉由利用一級胺以及二級胺上之活性氫對環氧基良好的反應性,用聚醚胺 (Jeffamine)對環氧樹脂進行擴鏈改質,成功地以一種簡便的方式合成具有親水性基團的線性或是梳狀高分子,可應用於非離子型水性環氧樹脂之開發。從差式掃描量熱儀 (DSC)的測量結果中顯示,藉由導入不同種類的環氧樹脂與聚醚胺,能得到不同玻璃轉化溫度 (Tg)的結果。然而在相同的聚醚胺比例下,具有較長親水側鏈的梳狀結構系列高分子之Tg,較線性結構系列高分子低,推測是因為梳狀分子具有較多的末端基使分子容易運動。
在自乳化的乳液製備實驗結果中,發現本研究合成之線性結構的高分子無法成功自乳化,而梳狀結構的高分子之乳化結果則會受到以下兩種情況影響。首先,若是梳狀高分子具有相近分子量時,起始物分子量組成是較小的疏水性環氧樹脂或較大的親水性聚醚胺,可以使高分子的親水能力提升。另一部分,若梳狀高分子是使用相同的起始物,則會受到聚醚胺的比例與合成後分子的分子量互相競爭的影響,乳液粒徑大小有先升後降的現象。 後續將乳液塗覆於金屬表面,在成膜性與抗腐蝕性結果中也有不錯的表現。因此,本實驗成功從分子結構設計的觀點設計線性以及梳狀結構高分子,並經由改變起始物的組成與比例,探討其對自乳化結果的影響,藉由結構設計,可以得到不同的水性化結果。 In this study, linear and comb-like epoxy-based polymers were successfully synthesized. Epoxide groups can easily undergo ring opening reaction by primary or secondary amine. In our work, epoxy resins were modified with Jeffamines to obtain linear or comb-like polymers with hydrophilic groups, which can be applied to the development of nonionic waterborne epoxy-based polymers. In the results of DSC measurements, it was found that polymers with different Tgs could be obtained by introducing different kinds of epoxy resins and Jeffamines. At the same weight ratio of Jeffamines, the comb-like polymers with longer hydrophilic side chains exhibited lower Tgs than did the linear polymers. For self-emulsification investigations, the emulsions based on linear polymers could not be obtained, whereas the properties of the emulsions based on comb-like polymers might be influenced by the following factors. First, if the molecular weights of comb-like polymers were similar, the hydrophilicity of polymers would be increased by introducing the hydrophobic epoxy resins with smaller molecular weight or Jeffamines with larger hydrophilic content. On the other hand, if the comb-like polymers were composed of the same starting materials, the hydrophilicity of polymers would be influenced by the weight ratios of Jeffamines to epoxy resins or the molecular weights of the epoxy-based polymers. To sum up, the linear and comb-like polymers comprising hydrophobic and hydrophilic segments were successfully developed. Subsequently, a series of waterborne epoxy-based polymers were prepared via self-emulsification. After coating the waterborne epoxy-based polymers on the metal surfaces, the films with smooth surface exhibited good corrosion resistance. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/78800 |
DOI: | 10.6342/NTU201900650 |
全文授權: | 未授權 |
電子全文公開日期: | 2024-03-29 |
顯示於系所單位: | 高分子科學與工程學研究所 |
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