Development of Novel Self-Repairing Hybrid Materials via Diels-Alder Click Chemistry

• Main Authors: ZHUANG, YAN-NIAN, 莊延年
• Other Authors: LEE, YI-HUAN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/g478w4

碩士 === 國立臺北科技大學 === 分子科學與工程系有機高分子碩士班 === 107 === Wound healing is an intrinsic capability of biological substances. This self-repairing process needs organisms to sense and simultaneously cure the damage over a range of time periods and length scales. Unlike the biological systems, engineering materials such as polymers usually possess a limited lifetime because of the gradual degradation and unexpected damage suffered during long-term use. Therefore, the development of self-repairing functionalities to prolong the life time of the materials and ensure their safety is greatly required. So far, a number of strategies such as microscale capsule, cycloaddition reaction, metal–ligand complexation and hydrogen bonding attraction have been developed for fabricating self-repairing materials. Among these methodologies, significant attention has been paid to Diels-Alder (DA) reaction because this type of reaction can be easily triggered by a suitable thermal treatment. Despite the continuous progress of the DA systems, specific efforts with the DA based organic/inorganic hybrid materials are less common. In principle, incorporating inorganic substances into the DA based self-healing materials could efficiently increase their applicability to not only repair the defects, but also further offer multifunctional properties for developing advanced applications. In this study, we mad a new self-healing organic/inorganic hybrid system using polycaprolactone-poly(furfuryl glycidyl ether) copolymer (PCLF) as a polymer substrate. In order to prepare this material system, PCLF was first synthesized by ring-opening polymerization, and then different amounts of Fe3O4-MWCNTs blends were prepared into PCLF by co-precipitation method to prepare PCLF/Fe3O4-MWCNTs composites. Then, 1,1’-(methylenedi-4,1-phenylene)bismaleimide (BMI) was added to the PCLF/ Fe3O4-MWCNTs mixture and annealed at 80 °C to prepare PCLF/BMI/ Fe3O4-MWCNTs hybrid. Through this system, the furan group of PCLF and the maleimide group of BMI undergo a Diels-Alder reaction for forming a DA crosslinked network within the polymer matrix. This new material system exhibits superparamagnetic characteristics and excellent self-healing ability to self-repair scoring defects by inverse DA reaction. The hybrid system developed in this study shows smart materials that can be used as future applications.