{"id":{"repo_id":"birmingham","oai_identifier":"oai:etheses.bham.ac.uk:1084"},"canonical_url":"https://search.dev.ndltd.org/etd/birmingham/oai:etheses.bham.ac.uk:1084","repository":{"repo_id":"birmingham","name":"University of Birmingham","base_url":"https://etheses.bham.ac.uk/cgi/oai2"},"display":{"title":"Thermal characterisation of XB2-CA4 : cyclic poly(butylene terephthalate) with stannoxane catalyst","abstract":"The following investigation presents the melting, polymerisation and crystallisation kinetics of XB2-CA4, an oligomer powder of cyclic butylene terephthalate with a stannoxane catalyst, which polymerises into cyclic poly(butylene terephthalate) (cPBT). When heated this material undergoes very rapid concurrent polymerisation and crystallisation. These processes were separated using a combination of two different techniques in the DSC, and Avrami analyses on the data produced. As reported in previous literature it was thought that Stannoxane catalyst degradation above 220°C caused production of linear polymer[1]. However, FTIR and GPC experiments on samples heated to 230°C and 250°C, do not show production of linear polymer, but rather an increased production of cylcic polymer, but of a slightly lower molecular weight than that produced at 170°C and 190°C. It was initially thought that XB2-CA4 did not melt below 170°C, however, GPC experiments showed that some heavier molecules were produced in samples that were held at 150°C for more than 5 minutes. The molecular weight distributions from the GPC showed some significant findings with regard to the potential degradation of the samples above 220°C.","abstract_html":"The following investigation presents the melting, polymerisation and crystallisation kinetics of XB2-CA4, an oligomer powder of cyclic butylene terephthalate with a stannoxane catalyst, which polymerises into cyclic poly(butylene terephthalate) (cPBT). When heated this material undergoes very rapid concurrent polymerisation and crystallisation. These processes were separated using a combination of two different techniques in the DSC, and Avrami analyses on the data produced. As reported in previous literature it was thought that Stannoxane catalyst degradation above 220°C caused production of linear polymer[1]. However, FTIR and GPC experiments on samples heated to 230°C and 250°C, do not show production of linear polymer, but rather an increased production of cylcic polymer, but of a slightly lower molecular weight than that produced at 170°C and 190°C. It was initially thought that XB2-CA4 did not melt below 170°C, however, GPC experiments showed that some heavier molecules were produced in samples that were held at 150°C for more than 5 minutes. The molecular weight distributions from the GPC showed some significant findings with regard to the potential degradation of the samples above 220°C.","abstract_has_math":false,"creators":["Matthews, Alice"],"institution":"University of Birmingham","degree_name":"m_rs","degree_level":"m_rs","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2010,"date_issued":"2010-12","date_published":"2010-12","updated_at":"2026-07-24T01:11:19Z","subjects":["TP Chemical technology"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.sponsor","label":"Sponsor","values":["na"]},{"key":"dc:creator","label":"Author","values":["Matthews, Alice"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2010-12"]},{"key":"dc:date.issued","label":"Date","values":["2010-12"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["College of Engineering & Physical Sciences","School of Metallurgy and Materials"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Birmingham"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["http://etheses.bham.ac.uk//id/eprint/1084/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["m_rs"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["m_rs"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["TP Chemical technology"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://etheses.bham.ac.uk//id/eprint/1084/1/Matthews10MRes.pdf","http://etheses.bham.ac.uk//id/eprint/1084/2/Decl_IS_Matthews10MRes.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The following investigation presents the melting, polymerisation and crystallisation kinetics of XB2-CA4, an oligomer powder of cyclic butylene terephthalate with a stannoxane catalyst, which polymerises into cyclic poly(butylene terephthalate) (cPBT). When heated this material undergoes very rapid concurrent polymerisation and crystallisation. These processes were separated using a combination of two different techniques in the DSC, and Avrami analyses on the data produced. As reported in previous literature it was thought that Stannoxane catalyst degradation above 220°C caused production of linear polymer[1]. However, FTIR and GPC experiments on samples heated to 230°C and 250°C, do not show production of linear polymer, but rather an increased production of cylcic polymer, but of a slightly lower molecular weight than that produced at 170°C and 190°C. It was initially thought that XB2-CA4 did not melt below 170°C, however, GPC experiments showed that some heavier molecules were produced in samples that were held at 150°C for more than 5 minutes. The molecular weight distributions from the GPC showed some significant findings with regard to the potential degradation of the samples above 220°C."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Thermal characterisation of XB2-CA4 : cyclic poly(butylene terephthalate) with stannoxane catalyst"]}]}],"canonical_facts":{"dc:contributor.sponsor":["na"],"dc:creator":["Matthews, Alice"],"dc:date":["2010-12"],"dc:date.issued":["2010-12"],"dc:description.abstract":["The following investigation presents the melting, polymerisation and crystallisation kinetics of XB2-CA4, an oligomer powder of cyclic butylene terephthalate with a stannoxane catalyst, which polymerises into cyclic poly(butylene terephthalate) (cPBT). When heated this material undergoes very rapid concurrent polymerisation and crystallisation. These processes were separated using a combination of two different techniques in the DSC, and Avrami analyses on the data produced. As reported in previous literature it was thought that Stannoxane catalyst degradation above 220°C caused production of linear polymer[1]. However, FTIR and GPC experiments on samples heated to 230°C and 250°C, do not show production of linear polymer, but rather an increased production of cylcic polymer, but of a slightly lower molecular weight than that produced at 170°C and 190°C. It was initially thought that XB2-CA4 did not melt below 170°C, however, GPC experiments showed that some heavier molecules were produced in samples that were held at 150°C for more than 5 minutes. The molecular weight distributions from the GPC showed some significant findings with regard to the potential degradation of the samples above 220°C."],"dc:format":["application/pdf"],"dc:identifier.uri":["http://etheses.bham.ac.uk//id/eprint/1084/1/Matthews10MRes.pdf","http://etheses.bham.ac.uk//id/eprint/1084/2/Decl_IS_Matthews10MRes.pdf"],"dc:publisher.department":["College of Engineering & Physical Sciences","School of Metallurgy and Materials"],"dc:publisher.institution":["University of Birmingham"],"dc:relation.isreferencedby":["http://etheses.bham.ac.uk//id/eprint/1084/"],"dc:subject":["TP Chemical technology"],"dc:title":["Thermal characterisation of XB2-CA4 : cyclic poly(butylene terephthalate) with stannoxane catalyst"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["m_rs"],"dc:type.qualificationname":["m_rs"]},"updated_at":"2026-07-24T01:11:19Z"}