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基于环糊精(CD)的单链与双链包结聚准轮烷(PPR)和聚轮烷(PR)的研究引起人们的极大兴趣.大量证据表明聚乙二醇(PEG)链段能够以折叠双链或双链并行的方式穿过γ-CD空腔.利用双2-溴异丁酰为端基的PEG与γ-CD进行自组装能形成双链包结聚准轮烷,并可作为大分子引发剂引发甲基丙烯酸正丁酯(BMA)发生本体原子转移自由基聚合(ATRP),聚合产物与其作为大分子引发剂的聚准轮烷都为PEG折叠双链包结结构的聚准轮烷.聚合产物能够在三氯甲烷中流延成膜.由于加入的γ-CD以管道结晶形式存在,与PBMA-PEG-PBMA三嵌段共聚物相比,该材料表现出较高的力学强度,但延伸性明显降低.与PBMA均聚物相比,其静态接触角有显著降低,却比PBMA-PEG-PBMA有少许增加.如将其溶于二氯甲烷中,可通过电纺丝加工成结构均匀的无纺布纤维,纤维形貌受到溶液浓度的影响.
The research on cyclodextrin (CD) -based single-stranded and double-stranded capped polyrotaxane (PPR) and polyrotaxane (PR) is of great interest. There is a lot of evidence that polyethylene glycol (PEG) Can pass through the γ-CD cavity in a folded double-stranded or double-stranded parallel manner.The double-stranded capped polyrotaxane can be formed by the self-assembly of bis-2-isobutyryl-terminated PEG and γ-CD, And can be used as a macroinitiator to initiate bulk atom transfer radical polymerization (ATRP) of n-butyl methacrylate (BMA). Both the polymerization product and its polyrotaxane as a macroinitiator are PEG-folded double-stranded inclusion structures Of the poly-paraffins. Polymerization products can be cast into a film in trichloromethane. Due to the presence of γ-CD in pipe-crystallized form, the material exhibits higher than the PBMA-PEG-PBMA triblock copolymer Mechanical strength, but significantly reduced extensibility.Compared with the PBMA homopolymer, its static contact angle decreased significantly, but slightly increased than the PBMA-PEG-PBMA.If it is dissolved in methylene chloride, by electricity Spinning process into a uniform structure of non-woven fibers, fiber morphology by the concentration of the solution.