Integrating Molecular Rigidity and Soft Matter Characters in Ladder Polymers
讲座名称：
Integrating Molecular Rigidity and Soft Matter Characters in Ladder Polymers
讲座时间：
2018-06-28
讲座人：
方磊
形式：
校区：
兴庆校区
实践学分：
讲座内容：
讲座题目： Integrating Molecular Rigidity and Soft Matter Characters in Ladder Polymers讲座人：方磊 博士 得克萨斯A&M大学(TAMU)化学系，助理教授
地点：西二楼 A102，曲江校区
时间：2018年6月28日，上午10:00
主办单位：前沿科学技术研究院
My research group has been focusing on the chemistry and processing of conjugated ladder polymers, in which all the polymer backbone units are fused and π-conjugated. This type of structure mimics the constitution of graphene nanoribbons, endowing synthetic polymers with promising electronic, optical, and mechanical properties. These unique rigid structure features, however, also lead to difficulties in defect-free synthesis, solubility, and mechanical adaptability. Therefore, these materials are not yet widely applicable despite the theoretical promises. To resolve this dilemma, we aimed to integrate the seemingly incompatible features of rigid ladder polymers with the advantages of conventional non-ladder type soft polymers. In one example, we utilized non-covalent bond to actively manipulate the coplanar conformation of ladder type macromolecules, and meanwhile to achieve solution processability. In another example, we developed an efficient method to construct covalent ladder polymer that is free of defect, using thermodynamically controlled ring-closing olefin metathesis. This new methodology enabled the synthesis of a wide variety of novel fused-ring compounds that are not accessible before. Moreover, we synthesized a highly robust ladder-type poly(indenoquinacridone) polymer equipped with numerous intermolecular hydrogen bonds through a scalable kinetic annulation strategy. The processability challenge of this highly insoluble material was addressed by using cleavable protecting side-chains, allowing for its application as solution-processed yet solvent-resistant films and composites. Overall, these advancements directly addressed the critical issues associated with the practical applications of ladder polymers.
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