Preparation and properties of wear‐resistant and flame‐retardant polyphenylsulfoneurea/monomer casting nylon copolymers

Abstract

A poly(phenylsulfone)‐urea (PPSUU) macro‐activator is synthesized by in situ anionic polymerization of 4,4′‐diaminodiphenylsulfone and hexamethylene diisocyanate. The PPSUU segment is embedded into the nylon molecular chain through copolymerization to improve the wear resistance and flame retardancy of monomer cast nylon 6 (MC PA6) materials. The mechanical properties, thermal stability, friction and wear properties and combustion heat release rate of copolymers with different macro‐activator contents are tested. Results indicate that a small amount of PPSUU can improve the wear resistance and impact properties of nylon materials. The wear loss of MC nylon is 54.8% less than pure MC nylon from 1.049 × 10−8 to 0.474 × 10−8 g/Nm with 6 wt% PPSUU. Moreover, better flame retardancy is verified. The peak of HRR reduced 36.8% from 654 to 413 kw/m2 with 4 wt% PPSUU, accompanied by advanced ignition time and flame extinction time, thus reducing the risk of fire.

Synthesis and Characterization of a New Copolymer Consisting of Polyamide 1210 and Reactive Phosphorus−Nitrogen Flame‐Retardant

“…It is well known that the mechanical properties of polyamides mainly depend on hydrogen bond, molecular chain structure, and crystallinity. [ 35 ] The incorporation of CDS leads to the destruction of the regularity of the polyamide molecular chain and the decrease of hydrogen bond density and crystallinity. Moreover, the bond energy of the P−C bond is lower than that of the N−C bond, and CDS may play the role of stress concentration in the copolymer, so the tensile strength, elongation at break, and notched impact strength of the copolymer are decreased.…”

Flame Retardancy of Nylon 6 Fibers: A Review

“…The final nylon 6 products, TPAEs, achieve a UL 94 V-0 rating and an LOI value higher than 35%. As shown in Figure 6, Lang et al [13] firstly synthesized the poly(phenylsulfone)urea (PPSUU) macro-activator by in situ anionic polymerization of 4,4'-diaminodiphenylsulfone and hexamethylene diisocyanate. Then the PPSUU segment was embedded into the nylon 6 molecular chain through copolymerization to prepare flame-retarded monomer-cast nylon 6 (MC-PA6) materials.…”

“…The results show that a small amount of PPSUU can not only improve the wear resistance and impact performance of nylon 6 material but also advance the ignition time and extinguishing time and reduce the fire risk. process of poly(phenylsulfone)-urea (PPSUU)/monomer cast (MC) nylon copolymer [13].…”

“…However, Jiang et al [17] proposed to design and synthesize a novel functional monomer (PEC) with a side-chain cage structure based on phosphorus, and prepared a thermoplastic flame-retardant polyamide polymer (PA 6-co-PEC), as shown in Figure 7. The introduction of the cage structure strengthened the entanglement of the polyamide chains [18], resulting in a 39% increase in mechanical strength and significantly improved heat As shown in Figure 6, Lang et al [13] firstly synthesized the poly(phenylsulfone)-urea (PPSUU) macro-activator by in situ anionic polymerization of 4,4'-diaminodiphenylsulfone and hexamethylene diisocyanate. Then the PPSUU segment was embedded into the nylon 6 molecular chain through copolymerization to prepare flame-retarded monomer-cast nylon 6 (MC-PA6) materials.…”

Preparation and properties of carboxylated cellulose nanofibers/monomer casting nylon composites

“…Instead, the impact strength of the copolymer decreased. [28,29] Figure 5 b shows the tensile strength of the MC nylon and composites. The tensile strength of the composites as the best, increased by 21.2% compared to MC nylon when 1.0 wt% CNF-C was added.…”