Effect of hot drawing on the structure and properties of novel polyamide 5,6 fibers

Eltahir, Yassir A.; Saeed, Haroon A. M.; Yuejun, Chen; Xia, Yueyuan; Wang, Yimin

doi:10.1177/0040517514527378

Cited by 30 publications

(14 citation statements)

References 22 publications

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“…Lysine decarboxylase is one of the PLP-fold type I enzymes and catalyzes the decarboxylation of lysine to cadaverine (also known as 1,5-diaminopentane), which is an important platform chemical used in the production of various bio-based polyamides 25 26 27 . These bio-based polyamides exhibit many attractive properties and could compete with the conventional petroleum-based polyamides in all examined fields 28 29 . Moreover, these polyamides are of special interest due to the increasing focus on a low-carbon bio-economy.…”

mentioning

confidence: 99%

Engineering a pyridoxal 5’-phosphate supply for cadaverine production by using Escherichia coli whole-cell biocatalysis

Cao

Zhang

et al. 2015

Sci Rep

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Although the routes of de novo pyridoxal 5′-phosphate (PLP) biosynthesis have been well described, studies of the engineering of an intracellular PLP supply are limited, and the effects of cellular PLP levels on PLP-dependent enzyme-based whole-cell biocatalyst activity have not been described. To investigate the effects of PLP cofactor availability on whole-cell biocatalysis, the ribose 5-phosphate (R5P)-dependent pathway genes pdxS and pdxT of Bacillus subtilis were introduced into the lysine decarboxylase (CadA)-overexpressing Escherichia coli strain BL-CadA. This strain was then used as a whole-cell biocatalyst for cadaverine production from L-lysine. Co-expression strategies were evaluated, and the culture medium was optimised to improve the biocatalyst performance. As a result, the intracellular PLP concentration reached 1144 nmol/gDCW, and a specific cadaverine productivity of 25 g/gDCW/h was achieved; these values were 2.4-fold and 2.9-fold higher than those of unmodified BL-CadA, respectively. Additionally, the resulting strain AST3 showed a cadaverine titre (p = 0.143, α = 0.05) similar to that of the BL-CadA strain with the addition of 0.1 mM PLP. These approaches for improving intracellular PLP levels to enhance whole-cell lysine bioconversion activity show great promise for the engineering of a PLP cofactor to optimise whole-cell biocatalysis.

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confidence: 99%

Engineering a pyridoxal 5’-phosphate supply for cadaverine production by using Escherichia coli whole-cell biocatalysis

Cao

Zhang

et al. 2015

Sci Rep

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“…In the hot‐drawn process, the stiff rod‐like molecular chains are not regular enough to crystallize, and the small crystallites in the amorphous region are reluctant to newly orient by reconstruction. Therefore, the crystalline orientation of hot‐drawn co ‐PMTA 3 fiber is unchanged and the crystallinity increases slightly, unlike those of poly(ethylene terephthalate) and polyamide fibers …”

Section: Resultsmentioning

confidence: 97%

Preparation and characterization of modified poly(m -phenylene terephthalamide) and its fiber

Wang

Chen²,

Xie³

et al. 2017

Polym. Int

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Modified poly(m-phenylene terephthalamide) (co-PMTA 3 ) was prepared by polycondensation of m-phenylenediamine, 4,4 ′ -diaminodiphenylsulfone and terephthaloyl dichloride with an initial feed mole ratio of 3:1:4 in N,N ′ -dimethylacetamide (DMAc). The co-PMTA 3 was dissolved in DMAc and then spun into fiber via wet spinning. The properties of co-PMTA 3 pulp and fiber were investigated using 1 H NMR spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy, X-ray diffraction, sonic velocity meter measurements and thermomechanical analysis. The results indicate that co-PMTA 3 has excellent heat resistance with a softening temperature of 323.6 ∘ C. The co-PMTA 3 fiber has high strength with a breaking strength of 4.7 cN dtex −1 and a knot tenacity of 2.2 cN dtex −1 .

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“…Moreover, PA56 also shows a higher dyebath exhaustion than PA6 during the dyeing process carried out with acid dyes . Overall, the biobased PA56 has a good balance between chemical resistance, wear and abrasion resistance, mechanical, and thermal properties …”

Section: Introductionmentioning

confidence: 94%

Morphology and Crystallization of Biobased Polyamide 56 Blended with Polyethylene Terephthalate

Yan

Gooneie

et al. 2018

Macro Materials & Eng

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This study attempts to promote biobased polyamide 56 (PA56) as a sustainable candidate to replace commercial PA6 and PA66 when blended with polyethylene terephthalate (PET). Scanning and transmission electron microscopy of the blends with different PA56 contents reveals an immiscible morphology with an increase in the size of the dispersed domains by increasing PA56 content. The steady‐state mixing torque of the kneader is decreased to half by adding 10 wt% of PA56 to PET. Further addition of PA56 gradually increases this torque but does not surpass the neat PET sample up to 30 wt% of PA56. As revealed by microscopic dissipative particle dynamics (DPD) simulations, this gradual increase is ascribed to the difficulty to disperse larger domains of PA56 in the thermodynamically undesired PET. The results confirm that PA56 has a lubricating effect in PET. Using polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X‐ray diffraction (XRD) techniques, it is shown that PA56 acts as a nucleating agent in PET. This leads to the formation of numerous small crystals in the blends as opposed to several large crystals in the neat samples. The results encourage the use of PA56 biomaterial in combination with PET in products such as bicomponent segmented pie fibers.

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Effect of hot drawing on the structure and properties of novel polyamide 5,6 fibers

Cited by 30 publications

References 22 publications

Engineering a pyridoxal 5’-phosphate supply for cadaverine production by using Escherichia coli whole-cell biocatalysis

Engineering a pyridoxal 5’-phosphate supply for cadaverine production by using Escherichia coli whole-cell biocatalysis

Preparation and characterization of modified poly(m -phenylene terephthalamide) and its fiber

Morphology and Crystallization of Biobased Polyamide 56 Blended with Polyethylene Terephthalate

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