Preparation of a novel styrene copolymer: Simultaneously improving the thermal stability and toughness

Abstract

In order to improve the flame retardancy of polystyrene, a phosphorus-and nitrogen-containing monomer, N,N-tetramethyl-bis(phospohonate)-2-hydroxyethyl bis(methylene) amine acrylate (BC 2 NP 2 ), was synthesized and characterized, and then incorporated into various amounts of polystyrene via radical emulsion copolymerization. The copolymers prepared were characterized by Fourier transform infrared, nuclear magnetic resonance spectra, transmission electron microscopy, differential scanning calorimetry, thermalgravimetric analysis, microscale combustion calorimeter, dynamic mechanical analysis, and impact tests. The results showed that all the copolymers had well spherical core-shell structure. Notably, despite a few amounts of the BC 2 NP 2 units in copolymers, all the copolymers exhibited significantly enhanced thermal stability, decreased glass transition temperature, and reduced flammability. Furthermore, from dynamic mechanical analysis and impact tests, it was observed the storage modulus was decreased and the impact strength had a certain degree of improvement with the incorporation of commoner.

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

“…3f, respectively (the particle size decreases with the increase of ammonium persulfate). The phenomenon indicates that the excessive anions S 2 O 4 2generated in the emulsion boosts the electrostatic repulsion between molecular groups, thereby, the stability of the nuclei is improved and the diameter of the products could be reduced [34]. Fig.…”

“…The diameter of the products increases from 0.8 μm to 2 μm with the promotion of the ratio of styrene and ammonium persulfate from 60: 1 to 100: 1. The phenomenon indicates that excessive styrene monomers could accelerate the growth of PS microspheres due to abundant nucleus for nucleating and extending [34].…”

The Preparation, Thermal Properties, and Fire Property of a Phosphorus-Containing Flame-Retardant Styrene Copolymer

“…The results showed that when the content of DOPOAA in the copolymer increased, the Tg value of the copolymer decreased to 103 and 97 °C. This was because the introduction of DOPOAA made the copolymer obtain higher molecular flexibility [31,32], and DOPOAA had a significant effect on plasticizing the PS matrix.…”

“…Compared with small molecule phosphorus-containing additive flame retardants, flame retardants that form an internal part structure show better stability and flame retardancy. Some phosphorus-containing flame-retardant monomers containing a C=C bond have been copolymerized with styrene to generate polymers with improved flame retardancy [31][32][33].…”

Fabricating a partial wetting structure for improving the toughness of intumescent flame‐retardant HDPE

“…Introducing an elastomer to polymers or polymer blends has been the most effective and economical means for improving their impact toughness . However, elastomers exhibit poor toughening efficiency when IFR is introduced to polymers or polymer blendsElastomers should be distributed in the matrix or encapsulated in the polymer/IFR.…”