Effects ofp-hydroxybenzoic acid monomer units on physical properties of thermal liquid crystalline poly(ester imide ketone)s

2006 ◽  
Vol 103 (5) ◽  
pp. 3183-3193 ◽  
Author(s):  
Jun Xu ◽  
Yafei Zhu ◽  
Yi Zhang ◽  
Yimin Zheng ◽  
Zhenguo Chi ◽  
...  
Keyword(s):  
Physical Properties ◽  
Liquid Crystalline ◽  
Hydroxybenzoic Acid

Synthesis and Properties of Biodegradable Liquid Crystalline Poly(ester-Urethane)s Based on Poly(L-Lactic Acid)

2013 ◽  
Vol 652-654 ◽  
pp. 459-462
Author(s):  
Ya Tong Guo ◽  
Zhu Zheng ◽  
Zhen Qi Hou ◽  
Jie Du
Keyword(s):  
Phase Transition ◽  
Thermal Stability ◽  
Lactic Acid ◽  
Physical Properties ◽  
Liquid Crystalline ◽  
Degradation Rate ◽  
Hydrolytic Degradation ◽  
Hexamethylene Diisocyanate ◽  
Solution Polymerization ◽  
Phase Transition Temperatures

A series of biodegradable segmented liquid crystalline poly(ester-urethane)s were prepared by solution polymerization of poly(L-lactic acid) (PLLA), mesogenic diol prepolymer poly(butylene terephthaloyldioxy dibenzoates) (MD), and hexamethylene diisocyanate (HDI). The MD content was varied from 0 to 40 mol% so that the effects of the mesogen content on the thermal and physical properties, and hydrolytic degradation were examined respectively. It was found that introducing mesogens units could increase the thermal stability and the elastic properties, while reduced the phase transition temperatures and the hydrolytic degradation rate.

Physical Properties of Liquid Crystalline 5-n-Hexyl-2-(4-n-alkyloxyphenyl)-pyrimidines

1986 ◽  
Vol 21 (5) ◽  
pp. 685-695 ◽  
Author(s):  
A. Hauser ◽  
Ch. Selbmann ◽  
R. Rettig ◽  
D. Demus
Keyword(s):  
Physical Properties ◽  
Liquid Crystalline

Physical Properties of Hydrogels Synthesized from Lyotropic Liquid Crystalline Templates

2003 ◽  
Vol 15 (17) ◽  
pp. 3376-3384 ◽  
Author(s):  
Christopher L. Lester ◽  
Shannon M. Smith ◽  
Colleen D. Colson ◽  
C. Allan Guymon
Keyword(s):  
Physical Properties ◽  
Liquid Crystalline

Molecular Dynamics Simulations of Liquid Crystalline Order for Tetramers of p-Hydroxybenzoic Acid

1994 ◽  
Vol 98 (31) ◽  
pp. 7685-7691 ◽  
Author(s):  
Johannes Huth ◽  
Thomas Mosell ◽  
Kai Nicklas ◽  
Alla Sariban ◽  
Juergen Brickmann
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Liquid Crystalline ◽  
Hydroxybenzoic Acid ◽  
Crystalline Order ◽  
Dynamics Simulations

Lower Branched Liquid Crystalline Polyester POSS Used as Collaborative Modifier for Epoxy Resin

2010 ◽  
Vol 150-151 ◽  
pp. 698-702
Author(s):  
Zhi You Yang ◽  
Shao Rong Lu ◽  
Zhi Yi Huang ◽  
Chun He Yu ◽  
Kuo Liu
Keyword(s):  
Impact Strength ◽  
Epoxy Resin ◽  
Decomposition Rate ◽  
Liquid Crystalline ◽  
Hydroxybenzoic Acid ◽  
Trimellitic Anhydride ◽  
Maximum Decomposition Rate ◽  
Oligomeric Silsesquioxane ◽  
The Impact ◽  
Liquid Crystalline Polyester

A new kind of lower-branched liquid crystalline polyester (LLCP) containing polyester mesogenic units was synthesized by p-hydroxybenzoic acid, terephthalyl chloride and trimellitic anhydride (TMA), then was used as collaborative modifier for the epoxy resin (E-51) with γ-azyl polyhedral oligomeric silsesquioxane (POSS). The experimental results showed that the LLCP / POSS could act as an effective toughening modifier for the epoxy resin. The impact strength of the composites modified with LLCP and POSS was 1.1 times higher than that of the unmodified system. The temperature of starting decomposition and maximum decomposition rate improved about 20 oC and 13 oC , respectively.

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