Abstract
Abstract In this work, we modified nylon 6 with liquid rubber by in-situ polymerization. The infrared analysis suggested that HDI urea diketone is successfully blocked by caprolactam after grafting on hydroxyl of HTPB, and the rubber-modified nylon copolymer is generated by the anionic polymerization. The impact section analysis indicated the rubber-modified nylon 6 resin exhibited an alpha crystal form.With an increase in the rubber content, nylon 6 was more likely to generate stable α crystal. Avrami equation was a good description of the non-isothermal crystallization kinetics of nylon-6 and rubber-modified nylon-6 resin. Moreover, it is found that the initial crystallization temperature of nylon-6 chain segment decreased due to the flexible rubber chain segment. n value of rubber-modified nylon-6 indicated that its growth was the coexistence of two-dimensional discoid and three-dimensional spherulite growth. Finally, the addition of the rubber accelerated the crystallization rate of nylon 6.
Highlights
Nylon 6 (PA6), which has high strength, wear resistance, oil resistance, weak acid and alkali resistance and good toughness, is widely used in the industrial field
The absorption peaks of cis-form 1, 4 addition structure are located at 3020cm−1, 1660cm−1, 1410cm−1 and 730cm−1, but the absorption peaks are weak, which suggests that Hydroxylterminated polybutadiene (HTPB) contains few cis-form 1, 4 addition structures; and 3356cm−1 indicates the characteristic spectra of -OH and HTPB [31]
The rubber activator terminated by acyl caprolactam was prepared by grafting the prepolymer of hydroxylterminated polybutadiene rubber with HDI urea diketone and terminating with caprolactam
Summary
Nylon 6 (PA6), which has high strength, wear resistance, oil resistance, weak acid and alkali resistance and good toughness, is widely used in the industrial field. It has disadvantage of low impact strength at dry. The hydroxyl-terminated liquid polybutadiene rubber is used for grafting isocyanate, and the polybutadiene rubber macromolecular activator having acyl-terminated caprolactam is prepared by blocking caprolactam. This work is licensed under the Creative Commons Attribution 4.0 pared by dissolving the macromolecular activator into the caprolactam monomer. The morphology and crystallization kinetics of rubber-modified nylon 6 resin are systematically studied
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