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首页> 外文学位 >Fundamental interactions driving the coil-to-globule transition and LCST behavior of poly(N-isopropylacrylamide) in water.
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Fundamental interactions driving the coil-to-globule transition and LCST behavior of poly(N-isopropylacrylamide) in water.

机译：基本相互作用驱动水中的聚（N-异丙基丙烯酰胺）的线圈到球过渡和LCST行为。

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摘要

I introduce and demonstrate a novel detector for characterization of lower critical solution temperature (LCST) behavior during synthesis. This new detector acts in concert with Automatic Continuous Online Monitoring of Polymerization (ACOMP) to correlate LCST behavior with other properties of the polymer system. As a result, the new detector system is called ''Second generation ACOMP'' (SGA). This allows me to observe, for the first time ever, LCST behavior of a polymer during synthesis.;ACOMP works by extracting a small stream of sample from a polymerization reaction, diluting it, and passing it through several detectors. This allows rapid characterization of molecular weight (Mw), radius of gyration (Rg), second virial coefficient (A2), and viscosity. For copolymers, ACOMP also characterizes the comonomer composition and comonomer composition drift.;The SGA detectors consist of three temperature-controlled single-angle light scattering flow cells. These allow the characterization of polymer aggregation due to LCST effects. The onset and temperature of this effect can be correlated to the more basic properties (primarily composition) of the polymer.;I use this detector to characterize the composition dependence of the LCST of poly(N-isopropyl acrylamide) (pNIPAM). I copolymerize NIPAM with the neutral, hydrophilic comonomer Acrylamide (Am), the anionic comonomer styrene sulfonate (SS), and the cationic comonomer [2-(acryloyloxy)ethyl]-trimethylammonium chloride (Q9). The effect of each of these comonomers on the LCST is compared. In addition, I compare the effect of ionic strength on the LCST of each of the copolymer systems.
机译：我介绍并演示了一种新颖的检测器，用于表征合成过程中较低的临界溶液温度（LCST）行为。该新型检测器与聚合反应的自动连续在线监测（ACOMP）协同工作，可将LCST行为与聚合物系统的其他特性相关联。结果，新的探测器系统被称为“第二代ACOMP”（SGA）。这使我有史以来第一次观察到聚合物在合成过程中的LCST行为。ACOMP的工作原理是从聚合反应中提取一小部分样品流，将其稀释并通过几个检测器。这样可以快速表征分子量（Mw），回转半径（Rg），第二维里系数（A2）和粘度。对于共聚物，ACOMP还可以表征共聚单体组成和共聚单体组成漂移。SGA检测器由三个温度控制的单角度光散射流通池组成。这些可以表征由于LCST效应引起的聚合物聚集。这种作用的开始和温度可以与聚合物的更基本特性（主要是组成）相关。我使用此检测器来表征聚（N-异丙基丙烯酰胺）（pNIPAM）LCST的组成依赖性。我将NIPAM与中性亲水性共聚单体丙烯酰胺（Am），阴离子共聚单体苯乙烯磺酸盐（SS）和阳离子共聚单体[2-（丙烯酰氧基）乙基]-三甲基氯化铵（Q9）共聚。比较了每种共聚单体对LCST的影响。另外，我比较了离子强度对每种共聚物体系的LCST的影响。

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  • 作者

    McFaul, Colin A.;

  • 作者单位

    Tulane University School of Science and Engineering.;

  • 授予单位 Tulane University School of Science and Engineering.;
  • 学科 Polymer chemistry.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 176 p.
  • 总页数 176
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
  • 关键词

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