Synthesis and Physical Properties of Non-Crystalline Nylon 6 Containing Dimer Acid

Abstract

In this study, a long carbon chain dimer acid is introduced into a nylon 6 structure and is copolymerized with different structural amines to produce amorphous nylon 6 by 4,4′-methylenebis(2-methylcyclohexylamine) (MMCA) in different copolymerization ratios. The effect of different structures and copolymerization ratios on the properties of nylon 6 is determined, along with the thermal properties, crystallinity, water absorption, dynamic mechanical properties, and optical properties. It is found that the melting point and the thermal cracking temperature Td10 of nylon 6 are respectively between 176 °C and 213 °C and 378 °C to 405 °C. The effect of introducing a bicyclohexane group containing a methyl side chain is greater than that of a meta-benzene ring, so COMM (synthesized by Caprolactam (C), dimer oleic acid (OA), and 4,4′-Methylenebis(2-methylcyclohexylamine) (MMCA)) has the lowest melting point, enthalpy, and crystallinity. As the copolymerization ratio increases, its thermal properties decrease. 10% is the lowest crystallinity. The amine structure containing a bicycloalkyl group has lower water absorption and a 10% copolymerization ratio gives the lowest water absorption. It contains the bicycloalkyl group, COM (synthesized by Caprolactam (C), dimer oleic acid (OA) and 4,4′-Methylenebis(cyclohexylamine) (MCA)), which has the highest loss modulus. The lowest loss modulus is noted for a copolymerization ratio of 7% and the value of tan δ increases as the copolymerization ratio increases. The introduction of nylon 6 with the bicycloalkyl groups, COMM and COM, significantly increases transparency. As the copolymerization ratio increases, the transparency increases and the haze decreases. The best optical properties are achieved for 10% copolymerization.

Biomass Thermoplastic (Co)polyamide Elastomers Synthesized from a Fatty Dimer Acid: a Sustainable Route toward a New Era of Uniform and Bimodal Foams

“…Note that no T c peak is witnessed for DFA-BDA 50 HMDA 50 , DFA-BDA 25 HMDA 75 , DFA-EDA 50 HMDA 50 , and DFA-EDA 25 HMDA 75 (co)­polyamides in the cooling run of the DSC traces (Figure C,D). The growing content of HMDA in these (co)­polyamides decreases the concentration of H-bonds formed, and, together with the great elasticity of the DFA and the existence of its methylene side chains, results in the lowermost degree of crystallinity, which is consistent with the creation of random structure sequences polymers. , …”

“…The growing content of HMDA in these (co)polyamides decreases the concentration of H-bonds formed, and, together with the great elasticity of the DFA and the existence of its methylene side chains, results in the lowermost degree of crystallinity, which is consistent with the creation of random structure sequences polymers. 42,44 The dynamic mechanical behaviors of the homo-and (co)polyamide samples have been examined employing DMA analysis. Figure 7A 3).…”

An Intrinsically Transparent Polyamide Film with Superior Toughness and Great Optical Performance

“…Besides blending, copolymerization is another approach to prepare transparent polyamide PA, which typically involves the polymerization of PA with other copolymer monomers with superior optical properties, and the resultant copolymer is always transparent [ 20 , 21 ]. For example, the bio-based 1,5pentylenediamine-2,5-furan dicarboxylic acid (FDCA) (PA 5F) and 1,10-decylenediamine (DA10)-FDCA(PA 10F) have been successfully prepared, which displayed not only high transparency but also good mechanical properties.…”

Influence of chemical composition and doping on optical properties of thallium selenide layers prepared by adsorption/diffusion method

“…In this study, the adsorption diffusion two-stage method, very similar to the SILAR method, was used to form a binary thallium selenide layer on a polyamide (PA) sheet. Polyamide is a semi-hydrophilic polymer capable of absorbing electrolytes from solutions [29]. This fact previously allowed the incorporation of selenotrithionionate anions (SeS 2 O 6 2−…”