Synthesis, characterization, andin vitro degradation of liquid-crystalline terpolyesters of 4-hydroxyphenylacetic acid/3-(4-hydroxyphenyl)propionic acid with terephthalic acid and 2,6-naphthalene diol

2002 ◽  
Vol 40 (11) ◽  
pp. 1845-1857 ◽  
Author(s):  
V. S. Prasad ◽  
C. K. S. Pillai
Keyword(s):  
Propionic Acid ◽  
Terephthalic Acid ◽  
Liquid Crystalline ◽  
Hydroxyphenylacetic Acid

Polyamides containing a biorenewable aromatic monomer based on coumalate esters: from synthesis to evaluation of the thermal and mechanical properties

2021 ◽  
Vol 12 (16) ◽  
pp. 2379-2388
Author(s):  
Jules Stouten ◽  
Aleksandra A. Wróblewska ◽  
Glenn Grit ◽  
Jurrie Noordijk ◽  
Bert Gebben ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Propionic Acid ◽  
Terephthalic Acid ◽  
Thermal And Mechanical Properties ◽  
Aromatic Polyamides ◽  
Aromatic Monomer

A new biobased alternative for terephthalic acid (TPA) in (semi-)aromatic polyamides is proposed, namely 4-carboxybenzene propionic acid (4CBPA).

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

High-performance all-aromatic liquid crystalline esteramide-based thermosets

2018 ◽  
Vol 31 (6) ◽  
pp. 631-639 ◽  
Author(s):  
Yiheng Dai ◽  
Xiangyu Bi ◽  
Theo J Dingemans ◽  
Qingbao Guan
Keyword(s):  
Tensile Strength ◽  
Terephthalic Acid ◽  
High Performance ◽  
Liquid Crystalline ◽  
High Concentration ◽  
Elongation At Break ◽  
New Family ◽  
Hydrogen Bonding Interactions ◽  
Naphthoic Acid ◽  
Melt Condensation

We have synthesized and characterized a new family of nematic all-aromatic polyesteramide thermosets based on 6-hydroxy-2-naphthoic acid (HNA), terephthalic acid (TA), and 4-acetamidophenol (AAP). In order to incorporate a high concentration of the amide-based monomer (AAP), the melt transition ( T K-N) and melt viscosity had to be lowered in order to maintain melt processable intermediates. Precursor thermoplastic reactive oligomers, end-capped with phenylethynyl functionalities, were prepared using standard melt condensation techniques with a target M n of 1000–9000 g mol−1. The reactive oligomers with 20–30 mol% AAP could easily be processed into films, and the films exhibit good tensile properties in terms of tensile strength (70–80 MPa) and elongation at break (7–10%). A glass transition of 191°C could be obtained when a 1000 g mol−1 oligomer (HNA/TA/AAP(20)–1 K) was thermally cross-linked. When the AAP concentration reaches 35 mol%, the rigidity of the backbone and the hydrogen bonding interactions are enhanced, which make HNA/TA/AAP(35) polymers difficult to process.

Sign in / Sign up

Export Citation Format

Share Document