Dong Qiujing, Luo Chunhua, Li Na, Chi Jiaxiang, Zhang Qingqing
School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang 236037, China.
Anhui Provincial Key Laboratory for Degradation and Monitoring of the Pollution of the Environment, Fuyang 236037, China.
Materials (Basel). 2018 Mar 22;11(4):473. doi: 10.3390/ma11040473.
A series of copolymers with an adamantyl side group (poly(NIPAM-co-AdMA) and poly(DMAM-co-AdMA)) were prepared by radical copolymerization of -isopropylacrylamide (NIPAM) and ,-dimethylacrylamide (DMAM) with a 2-methyl-2-adamantylmethacrylate (AdMA) monomer. The structure and composition of the as-synthesized copolymers were characterized by Fourier transform infrared (FT-IR) spectroscopy, proton nuclear magnetic resonance (¹H NMR) spectroscopy, gel permeation chromatography (GPC), thermogravimetric analysis (TGA), and elemental analysis. Temperature and recognition dual responsivity of the copolymers was investigated by cloud point (T) and dynamic light scattering (DLS), respectively. The results show that the as-synthesized copolymers are a kind of temperature-responsive polymer with a lower critical solution temperature (LCST). T was approximately consistent with the critical temperature of intermolecular copolymer association (T) from DLS. For these copolymers, T decreases with increasing content of AdMA unit in the copolymers. After the addition of β-cyclodextrins (β-CD), T increases, and the increment of T values gradually became large with increasing content of AdMA in the copolymers. It is host-guest molecular recognition of β-CD and adamantyl groups that endows the as-synthesized copolymers with recognition-tunable thermosensitivity.
通过异丙基丙烯酰胺（NIPAM）和N，N-二甲基丙烯酰胺（DMAM）与甲基丙烯酸2-甲基-2-金刚烷基酯（AdMA）单体进行自由基共聚反应，制备了一系列带有金刚烷基侧基的共聚物（聚（NIPAM-co-AdMA）和聚（DMAM-co-AdMA））。采用傅里叶变换红外（FT-IR）光谱、质子核磁共振（¹H NMR）光谱、凝胶渗透色谱（GPC）、热重分析（TGA）和元素分析对合成的共聚物的结构和组成进行了表征。分别通过浊点（T）和动态光散射（DLS）研究了共聚物的温度响应性和识别双重响应性。结果表明，合成的共聚物是一种具有较低临界溶液温度（LCST）的温度响应性聚合物。T与DLS得到的分子间共聚物缔合的临界温度（T）大致一致。对于这些共聚物，T随着共聚物中AdMA单元含量的增加而降低。加入β-环糊精（β-CD）后，T升高，并且T值的增量随着共聚物中AdMA含量的增加而逐渐变大。正是β-CD与金刚烷基之间的主客体分子识别赋予了合成的共聚物可调节识别的热敏感性。
