Polymorphism in a liquid crystalline polyester based on 4,4'-biphenol, terephthalic acid, and p-hydroxybenzoic acid (1:1:2)

1988 ◽  
Vol 21 (7) ◽  
pp. 2155-2160 ◽  
Author(s):  
N. D. Field ◽  
R. Baldwin ◽  
R. Layton ◽  
P. Frayer ◽  
F. Scardiglia
Keyword(s):  
Terephthalic Acid ◽  
Liquid Crystalline ◽  
Hydroxybenzoic Acid ◽  
Liquid Crystalline Polyester

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.

scholarly journals Liquid Crystalline Properties of the Copolyesters Prepared from Resorcinol, p-Hydroxybenzoic Acid, and Terephthalic Acid

1989 ◽  
Vol 21 (8) ◽  
pp. 615-622 ◽  
Author(s):  
Jung-Il Jin ◽  
Suck-Hyun Lee ◽  
Ho-Jin Park ◽  
Il-Joong Kim
Keyword(s):  
Terephthalic Acid ◽  
Liquid Crystalline ◽  
Hydroxybenzoic Acid

Studies on Sporopollenin Biosynthesis in Cucurbita maxima I: The Substantial Labeling of Sporopollenin from Cucurbita maxima after Application of [14C]Phenylalanine

1993 ◽  
Vol 48 (1-2) ◽  
pp. 10-15 ◽  
Author(s):  
Sabine Gubatz ◽  
Rolf Wiermann
Keyword(s):  
Terephthalic Acid ◽  
Phthalic Acid ◽  
Degradation Products ◽  
Hydroxybenzoic Acid ◽  
Cucurbita Maxima ◽  
Purification Step ◽  
Decanedioic Acid ◽  
Octanedioic Acid ◽  
High Level ◽  
Tracer Experiments

The results of tracer experiments performed with anthers of Tulipa cv. Apeldoorn have already shown that a high level of incorporation into the sporopollenin fraction was achieved, when [14C]phenylalanine was applicated as a precursor. In order to investigate whether the substantial incorporation of [14C]phenylalanine is a unique phenomenon restricted to Tulipa, tracer experiments were carried out on anthers of Cucurbita maxima. The sporopollenin fraction was isolated and purified by a gentle method including extractions with various solvents, incubations with hydrolysing enzymes and fractionated saponifications. The remaining, as well as the released radioactivity, was determined after each purification step. After the application of [U-14C]phenylalanine, a substantial incorporation into the sporopollenin fraction was determined. The values were clearly higher than those obtained with [1-14C]glucose or those from corresponding experiments on Tulipa anthers. After potash fusion of sporopollenin fractions labeled via [U-14C]phenylalanine, p-hydroxybenzoic acid was shown to be the main com ponent among the ether soluble acids; moreover it showed the highest level of radioactivity. No radioactivity was detected in the degradation products oxalic acid, benzoic acid, phthalic acid and terephthalic acid or octanedioic acid- and decanedioic acid-dimethylester.

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
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