Five CTA’s xanthate-type were synthesized and characterized and used in the controlled polymerization of N-vinylcaprolactam (NVCL) via reversible addition-fragmentation chain transfer (RAFT) polymerization. The CTA’s are linear (bifunctional), with three arms (from cholic acid or trimethylolpropane tris[poly(propylene glycol), amine terminated] ether), with six arms (from DPERT) and nine arms (from glycerol functionalized with cholic acid). Three of the synthesized CTA’s are reported for the first time. The intrinsic viscosity [η] and the Mark-Houwink-Kuhn-Sakurada (MHKS) constants were estimated in ethanol at 35 °C for each PNVCL polymer group. The η values for star-shaped polymers were lower compared with the linear analogues with similar molecular weights. Interestingly, the intrinsic viscosity values of two groups of polymers having three arms shown a noticeable difference, probably due to starting material used to prepare the CTA (rigid or flexible core). The MHKS exponents ranged from 0.68 to 0.82 indicates that all polymers behave as a flexible expanded conformation. The hydrodynamic diameter (D_h) of the polymers in ethanol solution was measured using DLS. The D_h values decreased significantly with the molecular weight (M_n) decreasing. The D_h values of linear polymers were higher compared with the stars one with similar molecular weights. Star-shaped PNVCL polymers containing cholane skeleton shown remarkable lower viscosity values.

合成并表征了五种CTA的黄原酸酯型，并将其用于N的可控聚合-乙烯基己内酰胺（NVCL）通过可逆加成-断裂链转移（RAFT）聚合。CTA是线性的（双功能的），具有三个臂（来自胆酸或三羟甲基丙烷三[聚（丙二醇），胺封端的）醚），具有六个臂（来自DPERT）和九个臂（来自由胆酸官能化的甘油）。首次报告了三个合成的CTA。对于每个PNVCL聚合物组，在35°C的乙醇中估算特性粘度[η]和Mark-Houwink-Kuhn-Sakurada（MHKS）常数。与分子量相似的线性类似物相比，星形聚合物的η值较低。有趣的是，两组具有三个臂的聚合物的特性粘度值显示出明显的差异，可能是由于准备CTA（刚性或柔性芯材）所用的原材料。MHKS指数在0.68至0.82的范围内，表明所有聚合物均表现为柔性扩展构象。流体动力直径（使用DLS测量乙醇溶液中聚合物的D _h）。所述d _ħ值随分子量（显著下降中号_Ñ）降低。线性聚合物的D _h值高于分子量相似的星形聚合物。含有胆烷骨架的星形PNVCL聚合物显示出明显较低的粘度值。