形状记忆聚己内酯泡沫的制备与力学性能分析

发布时间：2018-04-12 20:26

本文选题：形状记忆聚己内酯泡沫 + 复合材料　；参考：《哈尔滨工业大学》2016年硕士论文

【摘要】：随着形状记忆聚合物的迅猛发展,形状记忆聚合物在多种多样的领域都发挥着越来越重要的作用,例如航空航天领域、生物医学领域和智能服饰领域等等,可以作为驱动器、智能缓释胶囊、组织培养支架等等。而形状记忆泡沫以其极大的可压缩性能的优势,在生物医学领域受到了较大的关注,可以用于微创手术当中,最理想的是生物可降解的材料可以在完成任务后自动降解,免去二次开刀的痛苦,因此本论文采用形状记忆聚己内酯作为基体,丝蛋白作为功能相提高生物降解性能和亲水性。本文通过固态发泡法利用聚己内酯结合再生丝素蛋白的低免疫原性和生物相容性改善聚己内酯性能。利用SEM、DSC、DMA和溶胀平衡法等对形状记忆聚己内酯泡沫进行微观结构、转变温度、动态力学性能和交联度等材料表征。随着交联剂的增加,交联度增加、泡孔率增加、转变温度降低、结晶度降低。随着丝蛋白的增加,转变温度升高、结晶度降低。对制得的形状记忆聚己内酯泡沫进行力学压缩测试,包括常温压缩力学性能测试以及高温压缩性能测试实验,得到力学压缩曲线,对压缩过程中泡孔的变形过程与宏观模量变化关系的分析与解释,测量泡沫的压缩模量,分析了不同配比对于模量的影响。随着交联剂含量的增加,有效弹性模量降低、屈服强度降低。测量与泡沫压缩温度相对应的,形状记忆聚己内酯片状材料的拉伸性能,得到杨氏模量,利用所得的杨氏模量作为基础,以细观力学微分法作为理论和实验结果根基,对形状记忆聚己内酯泡沫的压缩模量进行分析与预测,并对压缩过程曲线进行模拟与仿真,仿真与模拟结果比较相符。可以为今后的形状记忆聚己内酯泡沫设计提供参考。利用形状记忆性能测试分析形状记忆聚己内酯泡沫在加热条件下的形状固定率和形状回复率,以及形状记忆聚己内酯泡沫在溶剂作用下的形状回复分析,以及循环加载结果分析。材料的固定能力比较好,回复率高。
[Abstract]:With the rapid development of shape memory polymers, shape memory polymers play a more and more important role in a variety of fields, such as aerospace, biomedical, intelligent clothing and so on.Intelligent sustained release capsule, tissue culture scaffold and so on.Shape memory foam has attracted much attention in biomedical field because of its great compressibility, and it can be used in minimally invasive surgery. The ideal is that biodegradable materials can be degraded automatically after completing the task.Therefore, shape memory polycaprolactone was used as matrix and silk protein as functional phase to improve biodegradability and hydrophilicity.In this paper, the low immunogenicity and biocompatibility of polycaprolactone combined with regenerated silk fibroin were used to improve the properties of polycaprolactone by solid state foaming method.The microstructure, transition temperature, dynamic mechanical properties and crosslinking degree of shape memory poly (caprolactone) foam were characterized by SEM DSC-DMA and swelling equilibrium method.With the increase of crosslinking agent, the crosslinking degree increases, the porosity increases, the transition temperature decreases and the crystallinity decreases.With the increase of silk protein, the transition temperature increased and the crystallinity decreased.The mechanical compression test of shape memory polycaprolactone foam was carried out, including the mechanical properties test at room temperature and the compression performance test at high temperature, and the mechanical compression curve was obtained.The analysis and explanation of the relationship between the deformation process of the foam and the variation of the macroscopic modulus during the compression process, the measurement of the compression modulus of the foam, and the analysis of the influence of different ratios on the modulus are given.With the increase of crosslinking agent content, the effective elastic modulus decreases and the yield strength decreases.The tensile properties of shape memory polycaprolactone sheet materials corresponding to the foam compression temperature were measured, and the Young's modulus was obtained. The theoretical and experimental results were based on the mesomechanical differential method.The compression modulus of shape memory polycaprolactone foam was analyzed and predicted, and the compression process curve was simulated and simulated.It can provide reference for shape memory polycaprolactone foam design in the future.The shape fixation rate and shape recovery rate of shape memory polycaprolactone foam under heating and the shape recovery rate of shape memory polycaprolactone foam under solvent were analyzed by shape memory test.And the analysis of cyclic loading results.The fixation ability of the material is better and the recovery rate is high.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ317;TB381

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