文章摘要
单活性中心氧化还原体系引发N-异丙基丙烯酰胺在凹凸棒土表面的高效接枝聚合
Highly Efficient Graft Polymerization of N-Isopropylacrylamide on the Surface of Attapulgite Initiated by a Mono-Center Redox System
  
DOI:0.16865/j.cnki.1000-7555.2020.0007
中文关键词: 凹凸棒土  单活性中心引发体系  N-异丙基丙烯酰胺  接枝效率  接枝率
英文关键词: attapulgite  mono-center initiation system  N-isopropylacrylamide  grafting efficiency  grafting ratio
基金项目:江苏省高等学校自然科学研究项目(18KJB150004);江苏高校品牌专业建设工程;江苏高校优势学科建设工程;常州大学材料科学与工程学院研究生科研与实践创新计划
作者单位
刘昊天1,蔡子楠1,贾天飞1,杨海存1,马文中1,龚方红1,2,刘春林1,陶国良1 1. 常州大学材料科学与工程学院 常州大学材料科学与工程国家级实验教学示范中心江苏 常州 213164 2. 无锡职业技术学院 机械技术学院江苏 无锡 214121 
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中文摘要:
      利用γ-氨丙基三乙氧基硅烷(APTES)修饰凹凸棒土(ATP),然后分别与硝酸铈铵(CAN)和过硫酸铵(APS)构建单活性和双活性中心氧化还原引发体系,引发N-异丙基丙烯酰胺(NIPAM)接枝聚合制备杂化粒子。通过红外光谱、X射线光电子能谱、热失重分析和透射电镜等方法对杂化粒子进行了表征,比较了2种引发体系下的接枝效率,并详细研究了单活性中心引发体系下氧化剂和氢离子浓度及聚合温度对接枝率的影响。结果表明,单活性中心引发体系较适宜的聚合温度为30 ℃,氧化剂浓度为4 mmol/L,氢离子浓度为1.5 mol/L,聚合过程中的接枝效率远高于双活性中心引发体系,此条件下制得的杂化粒子的接枝率为33.3%,且具有明显的温度响应性。
英文摘要:
      Attapulgite (ATP) was modified by γ-aminopropyltriethoxysilane (APTES) as reductant, and then the mono-center and dual-center redox initiation system was constructed by using ammonium cerium nitrate (CAN) and ammonium persulfate (APS) as oxidant, respectively. Hybrid particles ATP grafted with poly(N-isopropylacrylamide) (ATP@PNIPAM) were prepared via surface-initiating graft polymerization (SIP), and characterized by FT-IR, XPS, TGA, and TEM, etc. The grafting efficiencies of both initiation systems were compared, and effects of the oxidant concentrations, hydrogen ion concentrations and polymerization temperature on the grafting ratios for the mono-center initiation system were studied in detail. The experimental results show that the optimal polymerization temperature is 30 ℃, the oxidant concentration is 4 mmol/L and the hydrogen ion concentration is 1.5 mol/L, the grafting efficiency during the whole polymerization process is much higher than that of the dual-center initiation system. Hybrid particles with the grafting ratio of 33.3% were prepared successfully under this condition and show obvious thermosresponsive behavior.
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