Reaction kinetics of liquid crystalline epoxy cured with aromatic diamine: Its synthesis and mechanical and electrical characteristics

2001 ◽  
Vol 82 (10) ◽  
pp. 2372-2380 ◽  
Author(s):  
J. Y. Lee ◽  
M. J. Shim ◽  
H. K. Lee ◽  
S. W. Kim
Keyword(s):  
Reaction Kinetics ◽  
Liquid Crystalline ◽  
Aromatic Diamine ◽  
Electrical Characteristics ◽  
Liquid Crystalline Epoxy ◽  
Kinetics Of

scholarly journals Controlling the Kinetics of an Enzymatic Reaction through Enzyme or Substrate Confinement into Lipid Mesophases with Tunable Structural Parameters

2020 ◽  
Vol 21 (14) ◽  
pp. 5116
Author(s):  
Marco Mendozza ◽  
Arianna Balestri ◽  
Costanza Montis ◽  
Debora Berti
Keyword(s):  
Reaction Kinetics ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Structural Parameters ◽  
Enzymatic Reaction ◽  
X Ray Scattering ◽  
Nitrophenyl Phosphate ◽  
Vis Spectroscopy ◽  
Kinetics Of ◽  
Enzyme Alkaline Phosphatase

Lipid liquid crystalline mesophases, resulting from the self-assembly of polymorphic lipids in water, have been widely explored as biocompatible drug delivery systems. In this respect, non-lamellar structures are particularly attractive: they are characterized by complex 3D architectures, with the coexistence of hydrophobic and hydrophilic regions that can conveniently host drugs of different polarities. The fine tunability of the structural parameters is nontrivial, but of paramount relevance, in order to control the diffusive properties of encapsulated active principles and, ultimately, their pharmacokinetics and release. In this work, we investigate the reaction kinetics of p-nitrophenyl phosphate conversion into p-nitrophenol, catalysed by the enzyme Alkaline Phosphatase, upon alternative confinement of the substrate and of the enzyme into liquid crystalline mesophases of phytantriol/H2O containing variable amounts of an additive, sucrose stearate, able to swell the mesophase. A structural investigation through Small-Angle X-ray Scattering, revealed the possibility to finely control the structure/size of the mesophases with the amount of the included additive. A UV–vis spectroscopy study highlighted that the enzymatic reaction kinetics could be controlled by tuning the structural parameters of the mesophase, opening new perspectives for the exploitation of non-lamellar mesophases for confinement and controlled release of therapeutics.

Synthesis of Three Novel Aromatic Biazomethine Liquid- Crystalline Epoxy Resins and Curing Reaction with Aromatic Diamine

2011 ◽  
Vol 216 ◽  
pp. 34-38
Author(s):  
Jun Gang Gao ◽  
Xiao Na Zhang ◽  
Yong Gang Du
Keyword(s):  
Melting Point ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Diphenyl Ether ◽  
Hydroxyl Group ◽  
Aromatic Diamine ◽  
Curing Reaction ◽  
Ozawa Equation ◽  
Liquid Crystalline Epoxy ◽  
Clearing Temperature

Three class of novel liquid crystalline epoxy resins containing azomething groups: N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl ether (p-BEPBDDE), N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl methane (p-BEPBDDM) and N,N’-Bis[(4-(2,3-epoxypropoxy)-benzyliden)-1,4- phenylene diamine] (p-BEPBPD) were synthesized and characterized. The results show that p-BEBDDE and p-BEBDDM belong to smectic texture and melting point is 239.5 and 178 oC, respectively. The p-BEPBD is nematic texture between its melting temperature (Tm) of 192 oC and clearing temperature (Ti) of 238 oC. The curing reaction can be described by Ozawa equation, and the alcohol-hydroxyl group can accelerate the curing reaction and decrease Ea in DSC experiment.

Preparation and cure kinetics of epoxy with nanodiamond modified with liquid crystalline epoxy

2018 ◽  
Vol 663 ◽  
pp. 1-8 ◽  
Author(s):  
Xin Luo ◽  
Xiaoyan Yu ◽  
Yuanhui Ma ◽  
Kimiyoshi Naito ◽  
Qingxin Zhang
Keyword(s):  
Liquid Crystalline ◽  
Cure Kinetics ◽  
Liquid Crystalline Epoxy ◽  
Kinetics Of

Study on Curing Mechanism of Azo-Containing Twin Liquid Crystalline Epoxy Resins with Anhydride

2013 ◽  
Vol 702 ◽  
pp. 119-122
Author(s):  
Teng Fei Shen ◽  
Fa Chao Wu ◽  
Ying Juan Sun
Keyword(s):  
Differential Scanning Calorimetry ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Curing Kinetics ◽  
Scanning Calorimetry ◽  
Curing Reaction ◽  
Azo Group ◽  
Liquid Crystalline Epoxy ◽  
Curing Mechanism ◽  
Kinetics Of

A series of novel azo-containing twin liquid crystalline (LC) epoxy monomers were cured with anhydrides without extra catalyst and the curing kinetics was investigated by non-isothermal differential scanning calorimetry (DSC) technique. The effect of Azo group on the Curing Kinetics of Epoxy/anhydride System was investigated and the result showed that Azo group served as a catalyst to accelerate the curing reaction. The curing mechanism was confirmed by the UV-Vis spectrum.

Curing kinetics of liquid-crystalline epoxy resins

1993 ◽  
Vol 13 (4) ◽  
pp. 571-584 ◽  
Author(s):  
C. Carfagna ◽  
E. Amendola ◽  
M. Giamberini ◽  
A. G. Filippov ◽  
R. S. Bauer
Keyword(s):  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Curing Kinetics ◽  
Liquid Crystalline Epoxy ◽  
Kinetics Of

Modeling of Curing Reaction Kinetics in Liquid-Crystalline Epoxy Resins

1997 ◽  
Vol 36 (8) ◽  
pp. 2976-2983 ◽  
Author(s):  
Giovanni Micco ◽  
Marta Giamberini ◽  
Eugenio Amendola ◽  
Cosimo Carfagna ◽  
Gianni Astarita
Keyword(s):  
Reaction Kinetics ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Curing Reaction ◽  
Liquid Crystalline Epoxy

Thermal properties and cure kinetics of a liquid crystalline epoxy resin with biphenyl-aromatic ester mesogen

2011 ◽  
Vol 513 (1-2) ◽  
pp. 88-93 ◽  
Author(s):  
Yin-Ling Liu ◽  
Zhi-Qi Cai ◽  
Xiufang Wen ◽  
Pihui Pi ◽  
Dafeng Zheng ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Epoxy Resin ◽  
Liquid Crystalline ◽  
Cure Kinetics ◽  
Aromatic Ester ◽  
Liquid Crystalline Epoxy ◽  
Kinetics Of
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