以核鹼基為基礎之自我修復超分子彈性體結構及機械性質之研究

Abstract

超分子聚合物由次級交互作用力結合而成，運用在聚合物材料上，可控制聚合物基質中的超分子自組裝。由於這種材料具有獨特的物理性質，使它們在許多領域的應用上備受重視。本論文利用互補多點式氫鍵，成功合成出一種新型、具熱可逆性的低分子量聚脲材料。這種在溫和條件下以熱壓法製成的新材料，可自組裝形成類似物理性交聯聚合物的薄膜，並具有良好的機械性質（楊氏模數= 14.9 MPa，斷裂伸展率= 386.93 %）。更重要的是，變溫流變性質證實動態交聯導致穩定、可逆性網絡的形成，使它在再循環/再加工過程中，可以快速的重新鍵結/分解，因此具有高度利用性。此外它具有獨特的自癒性質，在室溫下即可顯現優秀的自癒能力，恢復材料原本的機械性質。因此這種新開發的材料，在以自組裝動態網絡為基礎的次世代超分子彈性體產業發展上，將貢獻卓著。

Supramolecular polymer, the combination of secondary interaction and polymer material can be used to control supramolecular self-assembly in polymeric matrix, which materials exhibit unique physical properties that make them attractive for applications in various fields.In this thesis, a novel low-molecular-weight polyurea with thermoreversible ability was successfully prepared through the complementary multiple hydrogen bonds. This new material is able to self-assemble to form a physically crosslinked polymer-like membrane with good mechanical properties (Young’smodulus= 14.9MPa, elongation= 386.93 %) through hot pressing under mild conditions.More importantly, the temperature-dependent rheological characteristics demonstrated that dynamic cross-linking leads to formation of stably reversible networks, making it highly appealing for fast re-bonding/dissociation in recycling/reprocessing procedures. In addition, this offers a unique opportunity towards efficient self-healing ability, which shows excellent self-healingcapability to restore the mechanicalproperty at room temperature.Thus, this newly developed material provides a significant contribution to industrial development of next-generation supramolecular elastomerbased on self-assembling dynamicnetworks.