2024-03-29T02:26:49Zhttps://www.tdx.cat/oai/requestoai:www.tdx.cat:10803/527952017-09-21T01:36:22Zcom_10803_311col_10803_335
TDX (Tesis Doctorals en Xarxa)
author
Foix Tajuelo, David
authoremail
david.foix@urv.cat
authoremailshow
false
director
Serra i Albet, Àngels
codirector
Ramis Juan, Xavier
authorsendemail
true
2011-12-29T08:56:19Z
2011-12-29T08:56:19Z
2011-11-28
http://hdl.handle.net/10803/52795
T-1719-2011
RESUM
Les reïnes epoxi constitueixen un dels polímers més emprats en el món de la industria, si bé presenten una sèrie d’inconvenients, els més importants dels quals són: la seva inherent fragilitat, la seva excessiva resistència tèrmica que en dificulta l’eliminació d’un substrat un cop finalitzada la seva vida útil i l’encongiment que experimenten durant el procés de curat. Per tal de reduir o eliminar aquests problemes aquesta tesi proposa l’ús de polímers hiperramificats així com polímers estrella i copolímers lineal-hiperramificat de bloc com a modificants químics de reïnes comercials. Amb aquesta estratègia s’han aconseguit millorar la tenacitat degut a efectes flexibilitzants o a separacions de fase del modificant en la matriu epoxídica, així com reduir l’encongiment en el curat o la degradabilitat de les reïnes, sense afectar altres propietats de la reïna com la seva Tg o la seva duresa.
ABSTRACT
Epoxy resins are one of the most used polymers in the field of technological applications. However, they present some drawbacks being the most important the following: they are inherently brittle materials; they present excessive thermal resistance that limits their reworkability; and the shrinkage they experiment during curing. To overcome these problems this thesis proposes the use of hyperbranched polymers, as well as star polymers and lineal-hyperbranched block copolymers as chemical modifiers of commercially available epoxy resins. With this strategy tougher materials have been obtained due to either a flexibilizing effect or a phase separation of the modifier within the epoxy matrix. Moreover, the shrinkage on curing and the degradability of the thermosets have been improved without compromising other properties of the resin such as its Tg or its hardness.
eng
Hyperbranched
Epoxy resin
Thermoset
Hyperbranched polymers and other highly branched topologies in the modification of thermally and uv cured expoxy resins
info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion
URL
https://www.tdx.cat/bitstream/10803/52795/1/TESI.pdf
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URL
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TESI.pdf.txt