Synthesis and Characterization of Amphiphilic Copolymer Acrylic Acid-co-p-Chloromethylstyrene |
| |
| Authors: | Peng Zhang Ying Feng Rui Zhou Jiruo Zhao |
| |
| Institution: | Key Laboratory of Rubber-Plastics , (Qingdao University of Science and Technology), Ministry of Education , Qingdao, 266042, China |
| |
| Abstract: | The free radical copolymerization of acrylic acid (M1) with p-chloromethylstyrene (M2) in dioxane and in the presence of α,α′-azobisisobutyronitrile (AIBN) at 65°C is reported. Copolymer compositions of six copolymer samples obtained from feed ratios of M1:M2 = 95.2:4.8 to 21.4:78.6 were determined by 1H-NMR. The reactivity ratios of AA/p-CMS copolymerization system calculated by the F-R method were r 1 = 0.50 ± 0.06 and r 2 = 1.52 ± 0.15, almost the same as r 1 = 0.43 ± 0.21 and r 2 = 1.31 ± 0.14 by the extended K-T method. On the basis of the reactivity ratios of two monomers, the sequence length distribution in the AA/p-CMS copolymers was obtained. For f2 = 4.77%, the monomer unit of p-CMS is individually separated in the chain of AA; for f2 = 35.53%, the alternating tendency prevails and a large number of mono-sequences are formed. The number-average ( | |
| Keywords: | Acrylic acid p-chloromethylstyrene amphiphilic polymer reactivity ratios segment length distribution |
|
|
