Phase separation and rheological behavior in thermoplastic modified epoxy systems

2006 ◽  
Vol 284 (10) ◽  
pp. 1185-1190 ◽  
Author(s):  
Yingfeng Yu ◽  
Minghai Wang ◽  
Wenjun Gan ◽  
Shanjun Li
Keyword(s):  
Phase Separation ◽  
Rheological Behavior ◽  
Modified Epoxy ◽  
Epoxy Systems

Polymerization-Induced Viscoelastic Phase Separation in Polyethersulfone-Modified Epoxy Systems

2004 ◽  
Vol 108 (20) ◽  
pp. 6208-6215 ◽  
Author(s):  
Yingfeng Yu ◽  
Minghai Wang ◽  
Wenjun Gan ◽  
Qingsheng Tao ◽  
Shanjun Li
Keyword(s):  
Phase Separation ◽  
Modified Epoxy ◽  
Epoxy Systems

Viscoelastic Effects on the Phase Separation in Thermoplastics-Modified Epoxy Resin

2003 ◽  
Vol 36 (20) ◽  
pp. 7746-7751 ◽  
Author(s):  
Wenjun Gan ◽  
Yingfeng Yu ◽  
Minghai Wang ◽  
Qingsheng Tao ◽  
Shanjun Li
Keyword(s):  
Phase Separation ◽  
Epoxy Resin ◽  
Viscoelastic Effects ◽  
Modified Epoxy

scholarly journals PPG-Terminated Tetra-Carbamates as the Toughening Additive for Bis-A Epoxy Resin

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1522
Author(s):  
Ming Zhang ◽  
Mingqing Chen ◽  
Zhongbin Ni
Keyword(s):  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Microphase Separation ◽  
Intramolecular Interactions ◽  
Hexamethylene Diisocyanate ◽  
Separation Mechanism ◽  
Toughening Mechanism ◽  
The Impact ◽  
Modified Epoxy ◽  
Epoxy Systems

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.

Reaction-induced phase separation in poly(butylene terephthalate)-epoxy systems: 1. Conversion-temperature transformation diagrams

Polymer ◽  
1996 ◽  
Vol 37 (14) ◽  
pp. 3079-3085 ◽  
Author(s):  
P.A. Oyanguren ◽  
P.M. Frontini ◽  
R.J.J. Williams ◽  
E. Girard-Reydet ◽  
J.P. Pascault
Keyword(s):  
Phase Separation ◽  
Butylene Terephthalate ◽  
Temperature Transformation ◽  
Transformation Diagrams ◽  
Epoxy Systems ◽  
Conversion Temperature
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