PAA-b-PNIPAM-b-PAA温敏性共聚物的合成及性能研究
关键词 可逆加成-断裂转移聚合 最低临界溶解温度 温度响应性
毕业论文设计说明书外文摘要
Title Synthesis and properties of PAA-b-PNIPAM-b-PAA temperature-sensitive copolymer
Abstract
In this paper, We use the S, S'- bis (a, a'- dimethyl -a "- acetic acid) - trithiocarbonate (BDATC) as a chain transfer agent, acrylic acid (AA) and N- isopropylacrylamide (NIPAM) as a raw material synthesized a series of different block ratio of polyacrylic acid -b- poly N- isopropylacrylamide -b- polyacrylic acid (PAA-b-PNIPAM -b-PAA) by reversible addition - fragmentation transfer polymerization (RAFT). And the use of nuclear magnetic resonance spectroscopy (1H NMR), infrared spectroscopy (IR) to characterize the structure of the copolymer. By UV - visible spectrophotometer environment responsive to the copolymer solution has been explored. Experimental results show that the higher the proportion of copolymer PAA-b-PNIPAM-b-PAA of PNIPAM block, the corresponding isopropyl greater the proportion of the hydrophobic effect, namely its lower critical solution temperature (LCST) lower. Copolymer concentration, the lower the required molecular aggregation caused by the phase transition temperature behavior, ie the lower the LCST; Copolymer solution pH, the more fully ionized carboxyl its block PAA, the hydrophilic interaction strengthened to LCST increases; Temperature of the copolymer PAA-b-PNIPAM-b-PAA solution with sexual response reversibility, and elevating the temperature cycling 6 times this reversibility persists.
Keywords Reversible addition - fragmentation transfer polymerization Lower critical solution temperature Temperature-responsive
目 录
1 绪论 1
1.1 前言 1
1.2 以PNIPAM为基础的共聚物的合成 1
1.2.1 原子转移自由基聚合（ATRP） 1
1.2.2 氮氧自由基（TEMPO）体系 3
1.2.3 可逆加成-断裂转移聚合（RAFT） 4
1.2.4 阴离子活性聚合 5
1.3 以PNIPAM为基础系列共聚物的自组装 5
1.3.1 温度响应性共聚物 6
1.3.2 温度和pH双重响应性共聚物 6
1.4 以PNIPAM为基础的温敏共聚物的应用 7
1.4.1 生物医药 7
1.4.2 物料分离 8
1.4.3 纳米反应器 8
1.5 本论文的提出和主要研究内容 9
2 嵌段聚合物PAA-b-PNIPAM-b-PAA的合成 10