Title:
|
Isocyanate toughened pCBT: reactive blending and tensile properties
|
Author:
|
Abt, Tobias Martin; Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon; Bou Serra, Jordi; Sánchez Soto, Miguel
|
Other authors:
|
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. POL - Polímers Industrials Avançats i Biopolímers Tecnològics; Universitat Politècnica de Catalunya. ENGIBIO - Enginyeria i Biotecnologia; Universitat Politècnica de Catalunya. POLYCOM - Polimers i compòsits: tecnologia |
Abstract:
|
Electronic version of an article published as "Express polymer letters" vol. 7, nº. 2, February 2013, p. 172-185. |
Abstract:
|
Cyclic butylene terephthalate oligomers (CBT) were reacted in a ring-opening polymerization with three types of
isocyanates: a bifunctional aromatic type, a bifunctional aliphatic type and a polymeric aromatic isocyanate. All reactions
took place in a batch mixer. The use of 0.5 to 1 wt% isocyanate led to a dramatic increase in elongation at break of polymerized
cyclic butylene terephthalate (pCBT), from 8 to above 100%. The stiffness and strength of the modified pCBT, however,
were found to slightly decrease. Proton nuclear magnetic resonance (NMR) analysis shows that the formation of thermally
stable amide groups is the dominant chain extension reaction mechanism. Gel content measurements suggest a linear structure
for samples containing bifunctional isocyanates while pCBT modified with polyfunctional isocyanate exhibited some
gel formation at higher isocyanate content. Melting and crystallization temperatures as well as degree of crystallinity were
found to decrease with increasing isocyanate content. No phase separation was detected by scanning electron microscopy
(SEM) analysis. Moreover, a high degree of polymerization is deduced due to the absence of CBT oligomer crystals. |
Abstract:
|
Peer Reviewed |
Subject(s):
|
-Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials::Assaigs mecànics -Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers -Polymerization -Polymers--Mechanical properties -Polímers -- Propietats mecàniques |
Rights:
|
|
Document type:
|
Article - Published version Article |
Share:
|
|