Gelation behaviour during chainwise crosslinking polymerisation of methacrylate resins
1999 (English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 40, 5699-5707 p.Article in journal (Refereed) Published
The gelation process in chainwise crosslinking polymerisation of methacrylate resins with average functionalities of 2.1-50 (1.05-25 methacrylate groups/molecule) was investigated using dynamic mechanical analysis. For all systems a crossover in tan delta (tan delta independent of frequency) was observed at gelation. The gel time was found to decrease with increasing functionality of the system. Within the measured frequency ranges, power law behaviour for the dynamic modulus was observed at the gel point in all systems. A value of the power law exponent n of 0.4 +/- 0.2 to 0.6 +/- 0.1 (increasing with increasing functionality of the system) was determined for gelation during reactions at T greater than or equal to T-g infinity. This trend suggests that the differences in screening between the systems dominate over the difference in fractal dimension. For reaction temperatures below T-g infinity a value of n = 0.3 +/- 01 was obtained, which was attributed to the influence of micro-vitrification. (C) 1999 Elsevier Science Ltd. All rights reserved.
Place, publisher, year, edition, pages
1999. Vol. 40, 5699-5707 p.
gelation; power law behaviour; chainwise polymerisation
IdentifiersURN: urn:nbn:se:kth:diva-76105DOI: 10.1016/S0032-3861(98)00781-2OAI: oai:DiVA.org:kth-76105DiVA: diva2:490788
NR 201408052012-02-062012-02-062012-02-06Bibliographically approved