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گواهی نمایه سازی مقاله Investigation of pH-Induced Changes in a Methacrylate Terpolymer Chain Conformation Using Dilute Solution Viscometry

عنوان مقاله: Investigation of pH-Induced Changes in a Methacrylate Terpolymer Chain Conformation Using Dilute Solution Viscometry
شناسه (COI) مقاله: ICHEC07_537
منتشر شده در هفتمین کنگره ملی مهندسی شیمی در سال ۱۳۹۰
مشخصات نویسندگان مقاله:

Maryam Babaie - Novel Drug Delivery Systems Dept., Iran Polymer and Petrochemical Institute, Tehran, Iran
Mohammad Imani - Novel Drug Delivery Systems Dept., Iran Polymer and Petrochemical Institute, Tehran, Iran.
Hamed Azizi - Novel Drug Delivery Systems Dept., Iran Polymer and Petrochemical Institute, Tehran, Iran.
Farzad Lahoti - Fard - Novel Drug Delivery Systems Dept., Iran Polymer and Petrochemical Institute, Tehran, Iran.

خلاصه مقاله:
In this study, pH-induced changes in chain conformation of a methacrylate terpolymer i.e., poly(dimethylaminoethyl methacrylate-co-methyl methacrylate-co-butyl methacrylate) is followed as a function of mono (acetic acid) or dicarboxylic acids concentration. The polymer was dissolved in a solvent mixture comprising acetone, ethanol and 1-propanol. Dicarboxylic acids were also selected as a homologous series including oxalic, succinic and adipic acid. Reducedviscosities were determined using a capillary viscometer and used to determine chain conformation parameters using Fuoss model. It was observed that using acetic acid, tertiary aminefunctional groups on the polymer backbone was protonated by reducing pH values to values lowerthan 7.28 which in turn cause an increment in repulsive forces induced by electrostatic charges. These repulsive forces will expand the polymer coil helix. Intramolecular crosslinking was observed using dicarboxylic acids when polymer concentrations were much lower than C* values

کلمات کلیدی:
Polymer, Chain conformation, pH, Carboxylic acids, Dilute solution viscometry

صفحه اختصاصی مقاله و دریافت فایل کامل: https://www.civilica.com/Paper-ICHEC07-ICHEC07_537.html