Synthesis and Characterization of Water-Soluble Starch-Acrylamide Graft Copolymers
Synthesis and Characterization of Water-Soluble Starch-Acrylamide Graft Copolymers
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DOI：
10.1080/00222338608063408
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发表时间：
1986-04
期刊：
影响因子：
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通讯作者：
H. Pledger;T. Young;G.–S. Wu;G. Butler;T. Hogen-esch
中科院分区：
文献类型：
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作者：
H. Pledger;T. Young;G.–S. Wu;G. Butler;T. Hogen-esch
摘要 通过Ce4+引发丙烯酰胺(AM)与淀粉(ST)在30℃下接枝共聚制备了一系列水溶性淀粉-聚丙烯酰胺接枝共聚物(ST-g-PAM)。发现该共聚物含有 3-33%（重量）的 ST。共聚物的结构，包括每条链的平均接枝数和引发剂的效率，通过 ST 的酸催化降解，然后对 PAM 链进行尺寸排阻色谱 (SEC) 分析来确定，并发现与水解前聚合产物中游离 ST 的存在或不存在一致。发现每个淀粉分子的平均接枝数为三个或更少，具体取决于条件。引发剂效率 (6–43%) 随着 [Ce4+] 的增加和 [AM] 的减少而降低，并且发现这在定性上符合所提出的引发和聚合机制。低效率被证明部分是由于反应速率低......
Abstract A series of water-soluble starch-polyacrylamide graft copolymers (ST-g-PAM) were prepared by Ce4+-initiated graft copolym-erizations of acrylamide (AM) onto starch (ST) dissolved in water at 30°C. The copolymers were found to contain 3-33% (wt) of ST. The structure of the copolymers, including the average number of grafts per chain and the efficiency of the initiator, was determined by acid-catalyzed degradation of the ST followed by size exclusion chromatography (SEC) analysis of the PAM chains and was found to be consistent with the presence or absence of free ST in the polymerization product prior to hydrolysis. The average number of grafts per starch molecule was found to be three or less, depending on conditions. The initiator efficiency (6–43%) was shown to decrease with increasing [Ce4+] and decreasing [AM], and this was found to be qualitatively in accord with the proposed mechanism of initiation and polymerization. The low efficiency was shown to be due, in part, to the low rate of react...