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两亲性嵌段共聚物的电纺纤维及性能研究

时间:2019-10-05 20:42来源:毕业论文
以三硫代酯化合物(BDATC)为转移剂,采用可逆加成-断裂转移(RAFT)聚合,将苯乙烯(St)、马来酸酐(Man)、丙烯酸(AA)通过三步反应合成两亲性三嵌段共聚物聚苯乙烯-b-聚(苯乙烯

摘要本文以三硫代酯化合物(BDATC)为转移剂,采用可逆加成-断裂转移(RAFT)聚合,将苯乙烯(St)、马来酸酐(Man)、丙烯酸(AA)通过三步反应合成两亲性三嵌段共聚物聚苯乙烯-b-聚(苯乙烯/马来酸酐)-b-聚丙烯酸(PSt-b-PSMA-b-PAA)。并用红外光谱、核磁共振表征了聚合物的基团特征。该两亲聚合物既具有亲水基团PAA,又具有疏水基团PSt,而PSMA具有高活性,为后续交联提供交联点。两亲聚合物在选择性溶液中具有自组装的特性。其自组装形成的胶束在形貌和粒径上受到诸如溶液浓度、溶剂性质、pH等多方面的影响。随着胶束浓度的变大,胶束的粒径也随之变大;在DMF中,胶束呈球形,粒径较小;在THF中,胶束呈棒状,粒径较大;胶束粒径还随着溶液pH的升高而增大。本文还以该两亲性聚合物为原料,采用静电纺丝技术,制备了两亲性共聚物电纺纤维。并通过接触角测量,测定了其表面润湿性能。还进一步研究了电纺纤维在嵌段比例、处理液性质、pH等条件变化下亲疏水性的变化情况。通过乙二胺使得纳米纤维进一步交联,使之成为交联纤维,并将其性质与非交联纤维进行对比。研究发现交联纤维具有更好的亲水性能以及耐碱腐蚀性能。18921
关键词  两亲性三嵌段聚合物,活性自由基聚合,自组装,胶束,静电纺丝,接触角,亲疏水性
毕业设计说明书(毕业论文外文摘要
Title  Electrospun fibers of amphiphilic block copolymers and  its performance study
Abstract
In this paper, amphiphilic triblock copolymer of polystyrene -b- poly ( styrene / maleic anhydride )-b- polyacrylic acid (PSt-b-PSMA-b-PAA) was synthesized by the three -step reversible addition - fragmentation transfer (RAFT) polymerization with three thioester compound (BDATC) as transfer agent, the acid (St), maleic anhydride (Man), acrylic acid (AA) as monomers. Then we charactered the group characteristics of the polymer by IR and NMR . The amphiphilic polymer has a hydrophilic group PAA, and has a hydrophobic group PSt, PSMA has high activity and provides crosslinking sites for the subsequent crosslinking . Amphiphilic polymer having the characteristics of self-assembly in the selective solution. Its self- assembled micelles formed by the multiple effects such as concentration, solvent nature , pH , etc. on the morphology and particle size. As micelle concentration becomes large, the particle size of the micelle becomes larger ; in DMF , spherical micelles , the particle diameter is small ; THF in , rodlike micelles , a larger particle size ; the particle size also increases as the pH increases. The paper also use  electrospinning technique to prepared amphiphilic copolymers electrospun fibers with the amphiphilic polymer as raw materials. And we measured their surface wetting properties by contact angle ments. We also had a further study of the electrospun fibers’ hydrophilic and hydrophobic properties when its hydrophilic and hydrophobic block in the proportion, the nature of the treatment solution, pH or other conditions changed. Using ethylenediamine to a further crosslinking in order to make crosslinked fibers,and compared its nature with the non- crosslinked fibers. The study found the crosslinked fibers had a better performance of hydrophilic properties and alkali resistance. 源`自<六:维;论-文>网/www.lwfree.cn
Keywords  Amphiphilic triblock polymer, Living radical polymerization, Self-assembly, Micelles, Electrospinning, The contact angle, Hydrophilic and hydrophobic
目次
1  绪论    1
1.1  两亲性共聚物的合成与结构    1
1.1.1 两亲性共聚物的结构    1
1.1.2 两亲性共聚物的合成    2
1.2  两亲性共聚物的自组装    3
1.2.1 自组装的原理    3
1.2.2 影响胶束形貌的因素    4 两亲性嵌段共聚物的电纺纤维及性能研究:http://www.lwfree.cn/huaxue/20191005/40234.html
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