Molecular network development and evolution of nanoscale morphology in an epoxy-amine thermoset polymer

2012 ◽  
Vol 126 (4) ◽  
pp. 1394-1405 ◽  
Author(s):  
Christopher M. Sahagun ◽  
Katrina M. Knauer ◽  
Sarah E. Morgan
Keyword(s):  
Molecular Network ◽  
Network Development ◽  
Epoxy Amine ◽  
Thermoset Polymer ◽  
Development And Evolution ◽  
Nanoscale Morphology

Cure Kinetics and Network Development of a Very High Tg Naphthalene-Based Epoxy Amine Network

2021 ◽  
Author(s):  
Samuel R. Swan ◽  
Claudia Creighton ◽  
Bekim V. Gashi ◽  
James M. Griffin ◽  
Russell J. Varley
Keyword(s):  
Cure Kinetics ◽  
Network Development ◽  
Epoxy Amine ◽  
Very High

Evolution of mechano-chemistry and microstructure of a calcium aluminate-polymer composite: Part I. Mixing time effects

1995 ◽  
Vol 10 (7) ◽  
pp. 1746-1755 ◽  
Author(s):  
M.A. Gülgün ◽  
W.M. Kriven ◽  
L.S. Tan ◽  
A.J. McHugh
Keyword(s):  
Mixing Time ◽  
Diffusion Mechanism ◽  
Polymer Particle ◽  
Network Development ◽  
Mixing Rate ◽  
The Matrix ◽  
Torque Curve ◽  
Evolution Of Microstructure ◽  
And Diffusion ◽  
Development And Evolution

Paste development and evolution of microstructure, microchemistry, and mechanical properties of macro-defect-free composites were investigated. Mixing torque plots from a Banbury mixer showed a “window of processibility” within which an optimum polymer-particle network structure formed. This processing window can be controlled by mixing rate and temperature. Network development during paste formation governed the flexural strength and microstructure of the cured material. Electron microscopy studies of the composites corresponding to various points along the mixing torque curve revealed a matrix formation-destruction process that was linked to the mixing activity and the mechano-chemistry of the system. Microchemical evolution in the composite was studied by EDS. These studies suggested that a combined convection and diffusion mechanism was responsible for the migration of Al3+ and Ca2+ ions into the different regions of the microstructure. Increasing concentrations of these elements in the polymer regions stiffened the matrix, leading to complete degradation on further mixing.

Development and evolution: Evolutionary approach in psychopathology and psychotherapy

2010 ◽  
Vol 65 (1) ◽  
pp. 65-83 ◽  
Author(s):  
Bernadette Péley
Keyword(s):  
Evolutionary Approach ◽  
Development And Evolution

A tanulmány amellett érvel, hogy az adaptív mechanizmusoknak és diszfunkcióiknak a finom elemzése jelentősen hozzájárul a fejlődés és a betegségek jobb megértéséhez, és a betegségek osztályozásának és a terápiáknak új útját nyithatja meg. Az evolúciós megközelítés a pszichoterápiába nem új elméletet vagy terápiás megközelítést kíván bevezetni, hanem az emberi természet törvényszerűségei mentén új megértési stratégiákat javasol. A patológiás szerveződést alapvetően az adaptivitás dimenziójában gondolja el. Ez kikényszeríti a fejlődési történet és a multikauzalitás szem előtt tartását. Hosszú távon ez a tüneti kategorizáción alapuló diagnosztika újragondolását is jelenti.

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