Synthesis and characterization of novel thermally stable aromatic and semiaromatic polyamides derived from thiourea-based flexible diacid dichlorides

Kausar, Ayesha; Zulfiqar, Sonia; Ali, Liaquat; Sarwar, Muhammad Ilyas

doi:10.1007/s00706-010-0422-1

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…In recent years, a variety of approaches including blending, grafting, coupling, and so on, are available to improve the properties of PA6, and the most often used methods are chemical modification and extruding reaction, for example, copolymerizing caprolactam and other aromatic monomers, or blending PA6 and other semi aromatic polyamides, series of semi‐aromatic polyamides based on PA6 including PA6/6T, PA6T/6I, PA6T/66, and so on, were synthesized and commercialized . Alhough the aromatic segments endow these copolymers higher thermal stability, their melt point enhances along with the ratio of aromatic components increasing and makes the melt liquidity become worse, moreover, the selection of a suitable green solvent to prepare these polyamides become new problems to researchers. For a long time, semi‐aromatic copolyamides were prepared via two‐step polymerization process: first, the pre‐polymer was prepared in reaction kettle, and then solid state polymerization or melt polymerization via extruding was adopted to obtain the target products with high melt point .…”

Section: Introductionmentioning

confidence: 99%

A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer

Peng

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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In this work, a novel synthetic path for preparing semi-armotic components modified polyamide 6 was developed by caprolactam as solvent of purified terephthalic acid and 1,6-hexanediamine. First, the ring opening reaction and poly-addition of caprolactam were initiated by 1,6-hexanediamine to generate a prepolymer containing amino groups in both ends, then followed by the poly-condensation reaction with purified terephthalic acid, a long chain copolymer was produced, which the reaction time was reduced by 4 h compared with conventional hydrolytic ring-opening polymerization of pure caprolactam. By varying the ratio of terephthalic acid and 1,6-hexanediamine, a series of copolymers with different number average molecular weight and physical properties were prepared. Analytical results showed that the conversion percentage of caprolactam is significantly increased by the proposed method. Furthermore, this new copolymers exhibited excellent transparence and high decomposition temperature. Besides, the copolymers with average molecular weight !15,000 present good mechanical properties, making it a potentially useful application in plastics, textile yarn, and membranes. V C 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 959-967

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Section: Introductionmentioning

confidence: 99%

A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer

Peng

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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“…A solution of the above synthesized isophthaloyl diisothiocyanate 0.01 mol (2.0 g) in 50 mL of THF was prepared, to which 0.02 mol (2.0 g) of p-phenylene diamine was added with continuous stirring of 1 h under inert atmosphere [21,22] . Subsequently, filtration was carried out to remove solvent and vacuum dried to get the solid product (Scheme 1).…”

Section: Synthesis Of Poly(thiourea-amide) (Pta)mentioning

confidence: 99%

Novel Hybrids Derived from Poly(thiourea-amide)/Epoxy and Carbon Nanotubes

Kausar

Iqbal

Hussain

2013

Polymer-Plastics Technology and Engineering

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In the present work, nanocomposites of a matrix composed of poly(thiourea-amide) (an aramid)/epoxy (thermoset) and CNTs were fabricated. The hybrids were prepared by in situ polymerization using functionalized and nonfunctionalized CNTs. Amine-terminated poly(thiourea-amide)/epoxy/CNTs hybrids were cured at 120 C with different CNTs content. Chemical linking between amine terminated poly(thiourea-amide) and epoxide group of Bisphenol A diglycidyl ether (DGEBA) formed PTA/DGEBA complex. Hydrogen bonding of PTA with functionalized CNTs was expected to improve the hybrid characteristics. Tensile strength of functional hybrids ranged 57.36-60.68 MPa. 10% gravimetric loss (569-590 C) and T g of PTA/DGEBA/functional CNTs (235-238 C) showed improvement over PTA/DGEBA/nonfunctional CNTs.

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“…The above synthesized isophthaloyl diisothiocyanate (0.01 mol, 2.0 g) was dissolved in 50 mL of THF, and 0.01 mol PDA (2.0 g) was added to the mixture with continuous stirring (1 h) under inert atmosphere. 25,26 Afterward, the solvent was removed by filtration, and the product was dried under vacuum. FTIR (KBr) (Figure 2) displays secondary N-H stretching and bending vibration of 3313 and 1595 cm À1 , respectively.…”

Section: Synthesis Of Ptamentioning

confidence: 99%

Nanocomposites of poly(thioureaamide) with carbon nanotube

Kausar

Masbah-Ullah-Shah

Hussain

et al. 2013

High Performance Polymers

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In the current study, poly(thioureaamide) (PTA) was prepared from isophthaloyl diisothiocyanate and p-phenylenediamine using a facile condensation technique. Fourier transform infrared and proton nuclear magnetic resonance spectroscopic analyses confirmed the structure of the polymer obtained. PTA was then used as a matrix to synthesize organic hybrid materials. In this regard, the functionalized and nonfunctionalized multiwalled carbon nanotubes (CNTs) were utilized as fillers in this work to prepare the nanocomposites. In PTA and functional CNTs system, better compatibility between the organic matrix and the filler was confirmed using field effect scanning electron microscope. The micrographs revealed that the nanotubes were well dispersed in the matrix and packaging of polymer over the surface of functional CNTs. The interaction between polymer chains and functional reinforcement produced mechanical and heat-stable nanocomposites. The tensile strength of the functional CNT-based hybrids 53.21-57.11 MPa was improved as compared with the nonfunctional system (32.79 MPa). The 10% gravimetric loss (513-556 C) and the glass transition temperature of PTA/functional CNTs (184-191 C) depicted a considerable improvement over PTA/nonfunctional CNTs. The results showed the enhanced interactions between the two phases in PTA/functional CNT-based nanocomposites relative to PTA/ nonfunctional CNTs.

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Synthesis and characterization of novel thermally stable aromatic and semiaromatic polyamides derived from thiourea-based flexible diacid dichlorides

Cited by 7 publications

References 32 publications

A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer

A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer

Novel Hybrids Derived from Poly(thiourea-amide)/Epoxy and Carbon Nanotubes

Nanocomposites of poly(thioureaamide) with carbon nanotube

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