多形状记忆聚合物材料可记忆多个暂时形状，在外部刺激时，自动按照预先设定次序完成一系列形状变化，实现复杂动作，在医药器械、航天展开装置、电子智能器件等领域有极大的潜在应用价值，吸引了广泛研究兴趣。但是，目前文献报道具有多形状记忆功能的体系均较为特殊，尚无通识方法。在本项目中，申请者拟通过设计聚合物分子链序列结构为梯度结构实现多形状记忆功能，该方法有望发展成为一种设计、制备多形状记忆材料的通用方法。申请者拟研究分子链梯度结构设计实现多形状记忆功能的机理，研究半连续进料RAFT乳液聚合以实现对分子链序列结构的精确控制。本项目研究将揭示梯度共聚物独特的凝聚态及其动态演变，明确其独特力学、流变及链缠结性质，对加深聚合物分子链序列结构与聚集态、宏观性能之间关系认识，提高聚合物分子链序列结构的设计、调控水平有重要的科学意义，并推动多形状记忆材料的发展。

Multi-shape memory polymers have the capability of memorizing several temporary shapes. They can automatically change their shapes sequentially when exposed to certain stimulus. Due to their ability to accomplish predefined complicated actions they show great potentials in numerous high-tech fields such as medical devices, aircraft facilities and smart electronic devices. Therefore, they have attracted tremendous research interests recently. However, in all the methods realizing multi-shape memory capability special system is employed. There still lack a general method for various polymeric materials. In this project, the applicant for the first time propose a general method by designing the polymer chain sequence into a gradient structure to realize the multi-shape memory property. The applicant intends to reveal the mechanism of multi-shape memory effect realized by gradient polymer chain sequence and study semi-batch RAFT emulsion polymerization to prepare polymers with high molecular weight and precisely controlled chain sequence. In this project the gradient copolymer's phase segregation behavior and the evolution, its chain entanglement, mechanical and rheological properties will be studied. These studies will make scientific significance by contributing to the knowledge of the relationships between chain sequence, phase aggregation and the properties, improving designing and manipulating capability of polymer chain sequence.