• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Stimuli sensitive copolymer poly(N-tert-butylacrylamide-ran-acrylamide): Synthesis and characterization
【24h】

Stimuli sensitive copolymer poly(N-tert-butylacrylamide-ran-acrylamide): Synthesis and characterization

机译：刺激敏感性共聚物聚（N-叔丁基丙烯酰胺-ran-丙烯酰胺）：合成与表征

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Temperature sensitive random linear and crosslinked copolymers of N-tert-butylacrylamide (NTBA) and acrylamide (Am) were synthesized by the solution polymerization method, using regulated dosing of comonomer Am having a higher reactivity ratio (r(Am) = 1.5) than NTBA (r(NTBA) = 0.5). Copolymers with varying feed ratios of NTBA and Am (80:20 to 20:80 mol%) were synthesized and characterized. For the synthesis of copolymer hydrogels, N', N-methylene bisacrylamide (MBA) (1.13 mol%) was used along with monomers. The effect of composition on transition properties was evaluated for the linear copolymers and their hydrogels. A definite trend was observed. The incorporation of a higher percentage of the hydrophilic comonomer Am in the structure resulted in the shifting of the transition temperature towards a higher value. The transition temperatures of the copolymers synthesized with feed compositions of 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, and 20:80 mol% were found to be 2, 10, 19, 27, 37, 45, and 58degreesC, respectively. Differential scanning calorimetry (DSC) studies confirmed the formation of random copolymers. The copolymers synthesized with a monomer feed ratio of 50: 50 with regulated dosing showed a single glass transition temperature (T-g) at 168degreesC, while the copolymer synthesized with full dosing of Am at the beginning of the reaction showed two T(g)s, at 134 and 189degreesC. The copolymer samples were analyze by Fourier transform infrared spectroscopy (FTIR) for ascertaining the composition. The composition of the copolymers followed the trend of the feed ratio, but the incorporation of NTBA in the copolymers was found to be lower than the feed ratio because of lower than quantitative yields of the reactions. (C) 2004 Wiley Periodicals, Inc.
机译：N-叔丁基丙烯酰胺（NTBA）和丙烯酰胺（Am）的温度敏感型无规线性和交联共聚物是通过溶液聚合法合成的，其中使用的反应性比（r（Am）= 1.5）比NTBA高的共聚单体Am的调节剂量（r（NTBA）= 0.5）。合成并表征了具有不同进料比的NTBA和Am（80:20至20:80 mol％）的共聚物。为了合成共聚物水凝胶，将N'，N-亚甲基双丙烯酰胺（MBA）（1.13mol％）与单体一起使用。评估了线性共聚物及其水凝胶的组成对过渡性能的影响。观察到明确的趋势。在结构中引入更高百分比的亲水性共聚单体Am导致转变温度向更高的值移动。发现用进料组成为80：20、70：30、60：40、50：50、40：60、30：70和20:80 mol％合成的共聚物的转变温度为2、10、19分别为27、37、45和58℃。差示扫描量热法（DSC）研究证实了无规共聚物的形成。单体加料比为50:50且定量加料合成的共聚物在168°C时显示出单一的玻璃化转变温度（Tg），而在反应开始时以全剂量Am合成的共聚物显示出两个T（g），在134和189°C下。通过傅里叶变换红外光谱法（FTIR）分析共聚物样品以确定组成。共聚物的组成遵循进料比的趋势，但是由于反应的产率低于定量，发现共聚物中NTBA的掺入低于进料比。 （C）2004年Wiley Periodicals，Inc.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号