Determination of molecular weights of carboxy-terminated styrene-methacrylonitrile copolymers by titrimetry

Date of Publication

1998

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Chemistry

Subject Categories

Chemistry

College

College of Science

Department/Unit

Chemistry

Thesis Adviser

Clovia Holdsworth

Defense Panel Chair

Gerardo C. Janairo

Defense Panel Member

Anamy Ma. C. Paano
John Glenn Ramon

Abstract/Summary

The study aimed to determine the molecular weights of carboxy-terminated styrene-methacrylonitrile homo-and random copolymers, which were previously prepared by the free radical chain transfer process, by titrimetry. The molecular weights obtained from this study were compared with the molecular weights obtained previously from Gel Permeation Chromatography (GPC) to give information on the degree of functionalization of the polymers. The polymer samples were titrated with 0.0125 M standard sodium hydroxide solution until the phenolphthalein endpoint.

The molecular weights obtained in this study were too small compared to the molecular weights obtained from GPC, giving low values for the degree of functionalization. This means that during the chain transfer process, the chain transfer agent, HETMAA, wasn't efficient enough in incorporating the carboxyl end group to the polymer chain of styerene and methacrylonitrile.

Abstract Format

html

Language

English

Format

Print

Accession Number

TU17441

Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

[7], 22 leaves ; illustrations ; 28 cm.

Keywords

Polymers; Molecular weights

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