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).

Monomer Synthesis and Characterization of Novel Aromatic Polyamides

2012 ◽  
Vol 549 ◽  
pp. 45-49
Author(s):  
Wei Hu ◽  
Guang Xian Zhang ◽  
Feng Xiu Zhang ◽  
Hui Zheng ◽  
Ming Lu
Keyword(s):  
Mechanical Properties ◽  
Terephthalic Acid ◽  
High Performance ◽  
High Strength ◽  
Aromatic Polyamide ◽  
Synthesis And Characterization ◽  
Thermal And Mechanical Properties ◽  
Aromatic Polyamides ◽  
Ft Ir

Aromatic polyamides are high performance materials, having outstanding thermal and mechanical properties. Poly(2,5-Diamino-terephthalic acid) (PATA) was designed as a novel aromatic polyamide with high strength and modulus. In this paper, 2,5-Diamino-terephthalic acid (DATA), as a monomer of PATA, was synthesized from 2,5-Dimetyl-1,4-phenyldiamine (DPA). First step was the amidation of DPA by reacting with acetic anhydride to protect amido group. Then N-(4–Acetylamino-2,5-dimethyl–phenyl)-acetamide (AMPA) was oxidized by potassium permanganate. Finally, AMPA was hydrolyzed by sodium hydroxide and the monomer DATA was precipitated by hydrochloric acid around PH 5. DATA and all the intermediate products were characterized and confirmed by 1HNMR and FT-IR spectra. They were all in great agreement with the proposed structure. The overall yield of DATA was about 40.0%.

scholarly journals Biosynthesis and Characteristics of Aromatic Polyhydroxyalkanoates

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1267 ◽  
Author(s):  
Manami Ishii-Hyakutake ◽  
Shoji Mizuno ◽  
Takeharu Tsuge
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Degradation Behavior ◽  
Thermal And Mechanical Properties ◽  
Storage Material ◽  
Monomer Composition ◽  
Energy Storage Material ◽  
Marine Applications ◽  
Aromatic Monomer

Polyhydroxyalkanoates (PHAs) are polyesters synthesized by bacteria as a carbon and energy storage material. PHAs are characterized by thermoplasticity, biodegradability, and biocompatibility, and thus have attracted considerable attention for use in medical, agricultural, and marine applications. The properties of PHAs depend on the monomer composition and many types of PHA monomers have been reported. This review focuses on biosynthesized PHAs bearing aromatic groups as side chains. Aromatic PHAs show characteristics different from those of aliphatic PHAs. This review summarizes the types of aromatic PHAs and their characteristics, including their thermal and mechanical properties and degradation behavior. Furthermore, the effect of the introduction of an aromatic monomer on the glass transition temperature (Tg) of PHAs is discussed. The introduction of aromatic monomers into PHA chains is a promising method for improving the properties of PHAs, as the characteristics of aromatic PHAs differ from those of aliphatic PHAs.

scholarly journals Biodegradation of Aliphatic-Aromatic Copolyesters by Thermomonospora fusca and Other Thermophilic Compost Isolates

1998 ◽  
Vol 64 (5) ◽  
pp. 1731-1735 ◽  
Author(s):  
Ilona Kleeberg ◽  
Claudia Hetz ◽  
Reiner Michael Kroppenstedt ◽  
Rolf-Joachim M�ller ◽  
Wolf-Dieter Deckwer
Keyword(s):  
Mechanical Properties ◽  
Adipic Acid ◽  
Terephthalic Acid ◽  
Thermal And Mechanical Properties ◽  
Thermophilic Actinomycetes ◽  
Rapid Degradation ◽  
Thermomonospora Fusca ◽  
Degradation Rates ◽  
Degradation Tests ◽  
Degradation Step

ABSTRACT Random aliphatic-aromatic copolyesters synthesized from 1,4-butanediol, adipic acid, and terephthalic acid (BTA) have excellent thermal and mechanical properties and are biodegradable by mixed cultures (e.g., in compost). Over 20 BTA-degrading strains were isolated by using compost as a microbial source. Among these microorganisms, thermophilic actinomycetes obviously play an outstanding role and appear to dominate the initial degradation step. Two actinomycete strains exhibited about 20-fold higher BTA degradation rates than usually observed in a common compost test. These isolates were identified as Thermomonospora fusca strains. They appeared to be particularly suitable for establishment of rapid degradation tests and were used in comparative studies on the biodegradation of various polyesters.

scholarly journals Microcellular foamed aromatic polyamides (aramids). Structure, thermal and mechanical properties

2019 ◽  
Vol 110 ◽  
pp. 9-13 ◽  
Author(s):  
Blanca S. Pascual ◽  
Miriam Trigo-López ◽  
Cipriano Ramos ◽  
María Teresa Sanz ◽  
Jesús L. Pablos ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal And Mechanical Properties ◽  
Aromatic Polyamides

scholarly journals Heteroaromatic Polyamides with Improved Thermal and Mechanical Properties

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1793
Author(s):  
Miriam Trigo-López ◽  
Ana M. Sanjuán ◽  
Aranzazu Mendía ◽  
Asunción Muñoz ◽  
Félix C. García ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Optical Properties ◽  
Thermal Performance ◽  
High Performance ◽  
Main Chain ◽  
Thermal And Mechanical Properties ◽  
Aramid Fibers ◽  
Aromatic Diamines ◽  
Aromatic Polyamides ◽  
Isophthaloyl Chloride

We prepared high-performance aromatic copolyamides, containing bithiazole and thiazolo-thiazole groups in their main chain, from aromatic diamines and isophthaloyl chloride, to further improve the prominent thermal behavior and exceptional mechanical properties of commercial aramid fibers. The introduction of these groups leads to aramids with improved strength and moduli compared to commercial meta-oriented aromatic polyamides, together with an increase of their thermal performance. Moreover, their solubility, water uptake, and optical properties were evaluated in this work.

Electron Microscopic Observation of the Longitudinal Organization of Poly (p-Phenylene Terephthalamide) Fibers

1982 ◽  
Vol 40 ◽  
pp. 680-681
Author(s):  
Li Li-Sheng ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Microscopic Observation ◽  
Electron Microscopic Observation ◽  
Electron Microscopic ◽  
Aromatic Polyamides ◽  
Radial Arrangement ◽  
Scanning Electron ◽  
Better Than

The aromatic polyamides form a class of fibers having mechanical properties which are much better than those of aliphatic polyamides. Currently, the accepted morphology of these fibers as proposed by M.G. Dobb, et al. is a radial arrangement of pleated sheets, with the plane of the pleats parallel to the axis of the fiber. We have recently obtained evidence which supports a different morphology of this type of fiber, using ultramicrotomy and ion-thinning techniques to prepare specimens for transmission and scanning electron microscopy.

Sign in / Sign up

Export Citation Format

Share Document