Monomer casting nylon-6-b-polyether amine copolymers: Synthesis and properties

Xu, Sheng; Ye, Lin

doi:10.1016/j.compositesb.2015.04.040

Cited by 24 publications

(11 citation statements)

References 13 publications

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“…Although PA6 demonstrated superior properties and widely used in industrial and commercial applications, it still has some disadvantages such as high moisture absorption, poor dimensional stability, and thermal properties. 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.…”

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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“…As reported, for the neat MCPA matrix, the polymerization process was fast due to the homogeneous reaction system and the high initiation activity of neat TDI microinitiator. However, as to the heterogeneous reaction system or the polymerization process initiated by macroinitiator, the reaction rate of the polymerization process was relatively lower . The temperature‐time relationship curves of this work during the polymerization process are shown in Fig.…”

Section: Resultsmentioning

confidence: 91%

“…PEA‐TDI macroinitiator was synthesized at room temperature based on the addition reaction between the ending amino group of PEA and the ending isocyanate group of TDI , the molar ratio [PEA]: [TDI] = 1:2.…”

Section: Methodsmentioning

confidence: 99%

Respective Contribution Research of Soft Component and Macroinitiator on Synthesis and Performance of MCPA‐PEA Materials

Wang

Liu

et al. 2017

Polymer Engineering & Sci

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The monomer casting polyamide‐polyether amine (MCPA‐PEA) materials initiated by TDI‐PEA macroinitiator presented an obvious toughness characteristic which was contributed by the combination effect of PEA‐TDI macroinitiator and soft PEA component itself. The MCPA‐PEA materials with different content of PEA‐TDI macroinitiator or PEA component were prepared and then the respective contribution of PEA‐TDI macroinitiator and soft PEA component on the synthesis and performance were researched. It was found that the PEA‐TDI macroinitiator presented the dominant contribution and main influence on the polymerization process with higher activation energy and reaction order than PEA component. The PEA molecular chains did not participated in the crystallization process and made no influence on crystal structure of MCPA material whatever the way of copolymerization or blending. The PEA‐TDI macroinitiator also showed the dominant contribution on the decreasing effect of crystallization properties than PEA component with lower crystallinity and smaller spherulites size. The fibrous‐structure for MCPA‐0.3%PEA matrix was more obvious with notable deformation and high impact strength which further indicated the dominant contribution of PEA‐TDI macroinitiator on toughness. The toughening mechanism was deduced as the vast energy consumption by intense extension of fibrous‐structure and the highly orientation of molecular chains. POLYM. ENG. SCI., 58:1353–1361, 2018. © 2017 Society of Plastics Engineers

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“…The first scanning was heated to 250°C by 20°C min −1 and keep isothermal for 5 minutes to eliminate previous thermal history; the second scanning was cooled to 30°C by 10°C min −1 ; and the last scanning was heated to 250°C by 10°C min −1 . The crystallinity ( X C, DSC ) can be calculated by the following equation:

X_{normalC, DSC} = ([], normalΔ H_{m} / ((), w normalΔ H_{0})) \times 100 %

where w is the mass fraction of each component; Δ H m is the melting enthalpy of the samples and Δ H 0 is the balance melting enthalpy, that is, the melting enthalpy of 100% MC nylon 6 is 230 J g −1 …”

Section: Methodsmentioning

confidence: 99%

Simultaneous enhancements of mechanical and thermal properties of monomer cast nylon via polydimethylsiloxane‐modified kaolin

Ding

Wang

Ying³

et al. 2019

Polymer Composites

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Polydimethylsiloxane (PDMS)‐modified Kaolin was prepared by the reaction between kaolin and PDMS. MC nylon 6/kaolin and MC nylon 6/kaolin‐PDMS composites with different filler contents were prepared through in situ polymerization. Thermogravimetric analysis and differential scanning calorimetry analysis show that the feeding of kaolin improved thermal stability and crystallinity of nylon. When 1 wt% addition of kaolin‐PDMS, the tensile strength and impact strength of the as‐prepared composites reached a maximum value of 77.7 MPa and 4.5 kJ/m2, respectively, exhibiting remarkable mechanical properties. Meanwhile, the water absorption capacity of the as‐prepared composites was greatly reduced by 60% with the addition of kaolin, and the modified kaolin possesses even better performances. The results show that the treated kaolin can greatly enhance the properties of cast nylon and has an outstanding application prospect.

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Monomer casting nylon-6-b-polyether amine copolymers: Synthesis and properties

Cited by 24 publications

References 13 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

Respective Contribution Research of Soft Component and Macroinitiator on Synthesis and Performance of MCPA‐PEA Materials

Simultaneous enhancements of mechanical and thermal properties of monomer cast nylon via polydimethylsiloxane‐modified kaolin

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