期刊
MACROMOLECULAR MATERIALS AND ENGINEERING
卷 306, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.202100254
关键词
crystallization; polyesters; shape memory materials
资金
- National Natural Science Foundation of China [52003301]
This article introduces a linear shape memory biodegradable polyester without chemical crosslinks or multiblock structures, with a new programming protocol to split crystals into two parts with different melting transitions. The split crystals play different roles in fixation and recovery, impacting the fixed rate and recovery rate. The shape memory performance can be optimized by controlling the ratio of partitioned crystals and pre-stretching of the sample.
Shape memory polymers (SMPs)are widely used owing to their ability to change shapes under external stimuli. Conventional covalently crosslinked SMPs have limitations in biomedical applications. This article presents a linear shape memory biodegradable polyester without chemical crosslinks or multiblock structures. A new programming protocol is developed to split the crystals into two parts with different melting transitions through partial melting/recrystallization. The split crystals play different roles in fixation and recovery process to complete a shape memory cycle. The ratio between the partitioned crystals affects the fixed rate and recovery rate. The shape memory performance can be optimized by controlling the partial melting temperature and pre-stretching of the sample. Examples of complicated shape changes demonstrate the effectiveness of the proposed technique. The method is applicable to crystallizable linear polymers and has potential applications in implantation devices.
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