Epoxy-Aromatic Diamine Kinetics. 2. Influence on Epoxy-Amine Network Formation

1995 ◽  
Vol 28 (23) ◽  
pp. 7608-7611 ◽  
Author(s):  
E. Girard-Reydet ◽  
C. C. Riccardi ◽  
H. Sautereau ◽  
J. P. Pascault
Keyword(s):  
Network Formation ◽  
Aromatic Diamine ◽  
Epoxy Amine

Real-time dielectric studies of network formation in thermally activated epoxy-amine and isocyanate-triol systems

Polymer ◽  
1995 ◽  
Vol 36 (24) ◽  
pp. 4547-4552 ◽  
Author(s):  
M. Tabellout ◽  
H. Randrianantoandro ◽  
J.R. Emery ◽  
D. Durrand ◽  
D. Hayward ◽  
...  
Keyword(s):  
Real Time ◽  
Network Formation ◽  
Dielectric Studies ◽  
Thermally Activated ◽  
Epoxy Amine

Following network formation in an epoxy/amine system by ultrasound, dielectric, and nuclear magnetic resonance measurements: A comparative study

2003 ◽  
Vol 88 (7) ◽  
pp. 1665-1675 ◽  
Author(s):  
R. E. Challis ◽  
M. E. Unwin ◽  
D. L. Chadwick ◽  
R. J. Freemantle ◽  
I. K. Partridge ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Comparative Study ◽  
Network Formation ◽  
Epoxy Amine ◽  
Amine System ◽  
Nuclear Magnetic

scholarly journals The Curing Rheokinetics of Epoxyphosphazene Binders

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5685
Author(s):  
Natalia V. Bornosuz ◽  
Irina Yu. Gorbunova ◽  
Vyacheslav V. Kireev ◽  
Denis V. Onuchin ◽  
Mikhail L. Kerber ◽  
...  
Keyword(s):  
Molecular Mass ◽  
Network Formation ◽  
High Density ◽  
Curing Process ◽  
Mass Growth ◽  
Modifying Additives ◽  
Rotational Viscometry ◽  
Epoxy Amine ◽  
Linear Chains ◽  
Viscosity Increase

The influence of epoxyphosphazene-modifying additives on the features of the hot curing process of epoxy-amine composition was studied by the rotational viscometry method. The modification caused an acceleration of the curing process, changed rheokinetics of viscosity increase, especially the stage molecular mass growth of linear chains became almost twice shorter for composition with 30% modifier than for unmodified one. We suggest the reason for these changes is the polyfunctionality of epoxyphosphazene, which finally results in high-density network formation. In cold curing process the bulkiness of epoxyphosphazene molecule and the lack of heat for its motion results in incomplete cure. Thus, in order to cope with these difficulties hot curing systems were proposed and studied.

Platelet Microtubules in Clot Structure Formation and Contractile Force Generation: Investigation of a Controversy

1986 ◽  
Vol 56 (01) ◽  
pp. 023-027 ◽  
Author(s):  
C J Jen ◽  
L V McIntire
Keyword(s):  
Network Formation ◽  
Contractile Force ◽  
Second Phase ◽  
Clot Retraction ◽  
Forming Process ◽  
Microtubule Organization ◽  
Physiological Processes ◽  
Fibrin Network ◽  
Two Parameters

SummaryWhether platelet microtubules are involved in clot retraction/ contraction has been controversial. To address this question we have simultaneously measured two clotting parameters, clot structural rigidity and isometric contractile force, using a rheological technique. For recalcified PRP clots these two parameters began rising together at about 15 min after CaCl2 addition. In the concentration range affecting microtubule organization in platelets, colchicine, vinca alkaloids and taxol demonstrated insignificant effects on both clotting parameters of a recalcified PRP clot. For PRP clots induced by adding small amounts of exogenous thrombin, the kinetic curves of clot rigidity were biphasic and without a lag time. The first phase corresponded to a platelet-independent network forming process, while the second phase corresponded to a platelet-dependent process. These PRP clots began generating contractile force at the onset of the second phase. For both rigidity and force parameters, only the second phase of clotting kinetics was retarded by microtubule affecting reagents. When PRP samples were clotted by adding a mixture of CaCl2 and thrombin, the second phase clotting was accelerated and became superimposed on the first phase. The inhibitory effects of micro tubule affecting reagents became less pronounced. Thrombin clotting of a two-component system (washed platelets/ purified fibrinogen) was also biphasic, with the second phase being microtubule-dependent. In conclusion, platelet microtubules are important in PRP clotted with low concentrations of thrombin, during which fibrin network formation precedes platelet-fibrin interactions. On the other hand they are unimportant if a PRP clot is induced by recalcification, during which the fibrin network is constructed in the presence of platelet-fibrin interactions. The latter is likely to be more analogous to physiological processes in vivo.

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