The mechanism of the ring-opening polymerization of ε-caprolactone using tin(IV) carboxylates

Persistent Link:
http://hdl.handle.net/10150/291748
Title:
The mechanism of the ring-opening polymerization of ε-caprolactone using tin(IV) carboxylates
Author:
Bassi, Mitchell Brian, 1963-
Issue Date:
1987
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The polymerization of epsilon-caprolactone using tin(IV) carboxylates has been investigated and related to literature research. Polymers with broad MWD were obtained in quantitative yield. At 100% conversion polymer molecular weights ranged from 50,000 to almost 60,000. After an initial induction period, the polymerization shows zero order kinetics with respect to monomer and near first order kinetics with respect to catalyst. The mechanism of the polymerization is coordination-type, and is dependent on the presence of water or an alcoholic initiator. Added water decreases polymer molecular weight to approx. 30,000 at 100% conversion. The polymer has a terminal hydroxyl group and a terminal carboxyl group. The hydroxyl end is the reactive end in propagation. The carboxyl end and free carboxylic acid produced by the hydrolysis of the catalyst are responsible for the induction period.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Polymerization.; Lactones.; Polymers.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Chemistry
Degree Grantor:
University of Arizona
Advisor:
Hall, Henry K., Jr.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleThe mechanism of the ring-opening polymerization of ε-caprolactone using tin(IV) carboxylatesen_US
dc.creatorBassi, Mitchell Brian, 1963-en_US
dc.contributor.authorBassi, Mitchell Brian, 1963-en_US
dc.date.issued1987en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe polymerization of epsilon-caprolactone using tin(IV) carboxylates has been investigated and related to literature research. Polymers with broad MWD were obtained in quantitative yield. At 100% conversion polymer molecular weights ranged from 50,000 to almost 60,000. After an initial induction period, the polymerization shows zero order kinetics with respect to monomer and near first order kinetics with respect to catalyst. The mechanism of the polymerization is coordination-type, and is dependent on the presence of water or an alcoholic initiator. Added water decreases polymer molecular weight to approx. 30,000 at 100% conversion. The polymer has a terminal hydroxyl group and a terminal carboxyl group. The hydroxyl end is the reactive end in propagation. The carboxyl end and free carboxylic acid produced by the hydrolysis of the catalyst are responsible for the induction period.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectPolymerization.en_US
dc.subjectLactones.en_US
dc.subjectPolymers.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineChemistryen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorHall, Henry K., Jr.en_US
dc.identifier.proquest1332525en_US
dc.identifier.oclc20021393en_US
dc.identifier.bibrecord.b18385758en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.