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PPG-Terminated Tetra-Carbamates as the Toughening Additive for Bis-A Epoxy Resin
- Source :
- Polymers, Polymers, Vol 11, Iss 9, p 1522 (2019)
- Publication Year :
- 2019
- Publisher :
- MDPI, 2019.
-
Abstract
- We synthesized PPG-terminated tetra-carbamates as a new toughening additive for epoxy thermosets through facile addition reaction of hexamethylene diisocyanate (HDI) with poly(tetra-methylene glycols) (PTMG) and poly(propylene glycols) (PPG). The effects of prepared tetra-carbamates on the rheological behavior of neat epoxy resin were studied along with the various cured properties of their modified epoxy systems. Four carbamate groups (−NHCOO−) endow the prepared additives not only with good intramolecular interactions, but also with optimal intermolecular interactions with epoxy polymers. This results in the suitable miscibility of the additives with the epoxy matrix for the formation of the typical biphasic structure of microparticles dispersed in the epoxy matrix via polymerization-induced microphase separation. The impact strength and critical stress concentration factor (KIC) of cured modified epoxy systems with the additives are significantly higher than those of unmodified epoxy systems, without sacrificing the processability (Tg) and flexural strength. The toughening mechanism is understood as a synergism combination among the phase separation mechanism, the in situ homogeneous toughening mechanism, and the particle cavitation mechanism.
- Subjects :
- chemistry.chemical_classification
epoxy polymer
Materials science
particle
Polymers and Plastics
microphase separation
Communication
Thermosetting polymer
Izod impact strength test
General Chemistry
Epoxy
Polymer
Polyvinyl alcohol
Miscibility
lcsh:QD241-441
chemistry.chemical_compound
toughening
Flexural strength
chemistry
Chemical engineering
lcsh:Organic chemistry
tetra-carbamates
visual_art
visual_art.visual_art_medium
Hexamethylene diisocyanate
Subjects
Details
- Language :
- English
- ISSN :
- 20734360
- Volume :
- 11
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Polymers
- Accession number :
- edsair.doi.dedup.....22200420e9e2c1e861f963908b89b1b2