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

سال انتشار: 1390
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 543

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شناسه ملی سند علمی:

ICHEC07_537

تاریخ نمایه سازی: 25 فروردین 1394

چکیده 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

نویسندگان

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.

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