@Article{JPM.2022.39.1-2.7,
AUTHOR = {JEEMOL. P. A, SURESH MATHEW, REGHUNADHAN NAIR C.P.},
TITLE = {Toughening of Unsaturated Polyester Resin by Blending with Polyether Telechelics. Dependency of Toughening Efficacy on End Groups},
JOURNAL = {Journal of Polymer Materials},
VOLUME = {39},
YEAR = {2022},
NUMBER = {1-2},
PAGES = {111--120},
URL = {http://www.techscience.com/jpm/v39n1-2/55984},
ISSN = {0976-3449},
ABSTRACT = {Polyether telechelics based on ethylene glycol,1,2-propylene glycol and 1,4- butylene glycol of
with various molar masses and bearing at both terminals functional groups such as maleimide,
itaconimide, nadimide and hydroxyl groups were individually examined as toughening agents for
an unsaturated polyester resin (UPER). For a given telechelic, the toughening effect was evaluated
at different mass ratios. The difference in toughening efficacy arose from the differential reactivity
of the telechelics end groups combined with the unsaturation of the UPER with the reactive
diluent, styrene. This causes a differential distribution of the polyether groups in the UPER
matrices, resulting in a differential dipolar interaction of the polyether segments among
themselves and with the UPER itself. The matrices cohesive strength is decided by these
interactions, the possibility for which is decided by the spacing of these polyether segments in
the matrix, as per the reactivity ratios between styrene-maleic complex pair and the polyether
end groups. An increased inter-segmental spacing of polyether could diminish the chance for
inter-segmental dipolar interactions that can stake the cohesive strength and thus the mechanical
properties of the matrices. These aspects have been quantified in terms of their efficacy factors
which conformed well to the strength and fracture properties of UPER blended in small proportions
with the end-functionalized polyether telechelics.},
DOI = {10.32381/JPM.2022.39.1-2.7}
}