Low pressure and low temperature synthesis of polyamide-6 (PA6) using Na 0 as catalyst

Farias-Aguilar, J.C.; Ramírez-Moreno, Margarita J.; Téllez-Jurado, Lucía; Balmori‐Ramírez, Heberto

doi:10.1016/j.matlet.2014.08.071

Cited by 51 publications

(51 citation statements)

References 14 publications

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“…(DH f = 67.11 J/g) [15]. The crystallization temperature (T c ) of starbranched and linear samples demonstrated the same tendency.…”

Section: Resultsmentioning

confidence: 71%

“…In Fig. 3, LPA6 showed the characteristic peaks at 2u = 20.48 and 24.08 which were associated with the monoclinic structure (a phase) [15]. The diffraction curve intensity of SPA6-100 and SPA6-50 dropped.…”

Section: Resultsmentioning

confidence: 93%

“…The anionic ROP of CL is an attractive protocol to melting cast polyamide 6 (MC PA6) in industry owing to the shorter reaction time (10-30 min), lower reaction temperature (150-180 8C) and pressure (atm) [14][15][16]. The anionic polymerization was usually conducted by a two-component system of a catalyst and an Nacyllactam type activator.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N , N′ , N″ -trimesoyltricaprolactam as a multifunctional activator

Zhu

Gong

Han

et al. 2015

Chinese Chemical Letters

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“…(DH f = 67.11 J/g) [15]. The crystallization temperature (T c ) of starbranched and linear samples demonstrated the same tendency.…”

Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 93%

See 1 more Smart Citation

Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N , N′ , N″ -trimesoyltricaprolactam as a multifunctional activator

Zhu

Gong

Han

et al. 2015

Chinese Chemical Letters

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“…PA6 genellikle monoklinik (α) ve yalancı altıgen (γ) olarak adlandırılan iki tip kararlı kristal yapıya sahiptir. α kristal fazı PA6 moleküllerinin anti paralel zincirler üzerinde hidrojen bağı yapması ile γ kristal fazı ise paralel zincirler üzerinde PA6 moleküllerinin hidrojen bağı yapmaları ile oluşmaktadır [20]. Şekil 2'den görüldüğü gibi PA6 her iki kristal yapıyı ihtiva ettiğini gösteren difraksiyon piklerine sahiptir.…”

Section: Bulgular Ve Tartişmaunclassified

“…Ayrıca polimorfik yapıda olan katkısız PA6' nın α fazı 222,5°C ile 225,5°C arasında erime piki verirken, γ fazı 215°C'de pik verdiği bilinmektedir [20]. DSC analiz sonuçlarına bakıldığında (Tablo 3) katkısız PA6'nın erime piki α fazına karşılık gelen 225°C'de, kompozitlerin erime sıcaklık değerleri ise γ fazının baskın olduğu 215°C'ye yakın sıcaklık değerlerinde görülmüştür.…”

Section: şEkil 6 Pa6/gnp-4 Kompozite Ait Tga-dtg Eğrisiunclassified

Poli̇ami̇d 6/Grafen Nanotabakali (Pa6/Gnp) Kompozi̇tleri̇n Termo-Mekani̇k Özelli̇kleri̇ni̇n Karakteri̇zasyonu

Mindivan

2018

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZBu çalışmada, Poliamid 6/Grafen Nanotabakalı (PA6/GNP) kompozitlerin yapısal ve termo-mekanik özelliklerine dolgu maddesi olarak kullanılan nanotabakalı grafen partiküllerinin etkisi incelenmiştir. Bu amaçla çift vidalı ekstrüzyon cihazı ile eriyik harmanlama yöntemi kullanılarak PA6/GNP kompozitleri hazırlanmıştır. Kompozitler enjeksiyonlu kalıplama yöntemi kullanılarak test numunesi haline getirilmiştir. XRD ve DSC analiz sonuçları γ kristal fazının kompozitlerde baskın olduğunu göstermiştir. GNP katkılı PA6 kompozitlerin katkısız PA6' ya göre termal olarak daha kararlı oldukları TGA analiz sonuçları ile belirlenmiştir. Kompozitlerin yeni ve baskın kristal yapıları sayesinde termo-mekanik özelliklerinin iyileştiği sonucuna ulaşılmıştır.Anahtar Kelimeler: Grafen Nanotabakalı Partikül (GNP), Poliamid 6 (PA6), Vicat Yumuşama Sıcaklığı, Isıl Bozunma Sıcaklığı (HDT), Eğme Modülü CHARACTERIZATION OF THERMO-MECHANICAL PROPERTIES OF POLYAMIDE 6/GRAPHENE NANOPLATES (PA6/GNP) COMPOSITES ABSTRACTIn this study, the effect of Graphene Nanoplates (GNP) as filler on the structure and thermo-mechanical properties of the Polyamide 6/Graphene Nanoplates (PA6/GNP) composites was investigated. For this purpose, PA6/GNP composites were prepared through a melt mixing method with twin screw extruder. These composites were formed into test samples using the injection molding method. γ phase crystal form in the PA6/GNP composites was shown to be dominated by XRD and DSC results. TGA analysis results indicated that the GNP filled PA6 composites were more thermally stable than the unfilled PA6. As a result, thermo-mechanical properties of PA6/GNP composites improved due to the new and dominant crystal structural form.

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Sustainable Nano‐Nonwoven Fabric Production from Recycled Polyamide 6 Waste via Electrospinning: Controlling Characteristics and Comprehensive Analytical Study

Metwally

Zayed

Rashed

et al. 2023

Adv Materials Technologies

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This study investigates the recycling of polyamide 6 (PA 6) wastes to produce nonwoven fabrics based on nanofibers (PA‐NWNF) to promote sustainable textile solid waste management and generate a novel material with exceptional properties. PA‐NWNF characteristics can be controlled by adjusting the electrospinning parameters. A comprehensive characterization will be performed using various analytical techniques, such as scanning electron microscopy (SEM), Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and dynamic mechanical analysis (DMA), to evaluate the unique properties as a function of the electrospinning parameters. According to the SEM results, concentrations of 21% are suitable to produce nanofiber with a well‐defined morphology, provided that the applied voltage is maintained at 20 kV and the collecting distance is above 10 cm, irrespective of the flow rate in the established protocol. XRD and FTIR analysis indicate a gradual decrease in the α‐phase and a simultaneous increase in the γ‐phase as the solution concentration increases. Moreover, low applied voltage favored β‐form crystallization over γ and α‐forms predominant at the higher voltage. DMA and BET data reveal that the elongated droplets formed at lower concentration exhibit a low storage modulus, high damping factor, highest surface area, and smallest pore diameters.

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Low pressure and low temperature synthesis of polyamide-6 (PA6) using Na 0 as catalyst

Cited by 51 publications

References 14 publications

Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N , N′ , N″ -trimesoyltricaprolactam as a multifunctional activator

Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N , N′ , N″ -trimesoyltricaprolactam as a multifunctional activator

Poli̇ami̇d 6/Grafen Nanotabakali (Pa6/Gnp) Kompozi̇tleri̇n Termo-Mekani̇k Özelli̇kleri̇ni̇n Karakteri̇zasyonu

Sustainable Nano‐Nonwoven Fabric Production from Recycled Polyamide 6 Waste via Electrospinning: Controlling Characteristics and Comprehensive Analytical Study

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