Synthesis of styrene-acrylonitrile random copolymers (SAN) and polyarylate block copolymers and the control of their mechanical properties by morphology generation

Ohishi, Hiroshi; Kishimoto, Souichiro; Ikehara, Takayuki; Nishi, Toshio

doi:10.1002/(sici)1099-0488(20000101)38:1<127::aid-polb16>3.0.co;2-4

Cited by 7 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The impact properties of the blend were not addressed in the paper. Ohishi et al synthesized SAN/polyacryate (PAr) block copolymers via polycondensation. The block copolymers (SAN‐b‐PAr) could be used as reactive compatibilizers in polyamide (PA) and ABS blends.…”

Section: Introductionmentioning

confidence: 99%

Morphology and mechanical properties of Acrylonitrile‐styrene‐acrylate toughened plastics with block copolymer chain structure

Huang

Luo

Gao

2018

Polymer Engineering & Sci

View full text Add to dashboard Cite

Acrylonitrile‐styrene‐acrylate (ASA) toughened plastics based on block copolymers are successfully prepared via RAFT emulsion polymerization and various molecular structures are designed to have different morphologies in order to investigate the relationship between morphologies and mechanical properties. All materials prepared by blending exhibit sea‐island morphology. Promoting particles dispersion and increasing spherical particle size shorten surface‐to‐surface interparticle distance and help to improve tensile properties of materials. Enlarging particles through crosslinked structures are found to be a more effective method to improve tensile toughness, at the cost of a slight reduction in tensile yield strength. Larger spherical particles with crosslinked structures are found to help improving the Izod notched impact strength of materials. However, the existence of a SAN core decreases the material's ability to withstand impact. Compared to blended samples, triblock copolymer materials display higher flexural strength with equal flexural modulus. POLYM. ENG. SCI., 59:389–395, 2019. © 2018 Society of Plastics Engineers

show abstract

Section: Introductionmentioning

confidence: 99%

Morphology and mechanical properties of Acrylonitrile‐styrene‐acrylate toughened plastics with block copolymer chain structure

Huang

Luo

Gao

2018

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…We carried out research and development on polymer blends based mainly on polystyrene and polyarylate (PS–PAr) block copolymers 24–29. In our earlier publications, we proposed a novel synthetic procedure for a PS–PAr block copolymer (Fig.…”

Section: Introductionmentioning

confidence: 99%

Phase morphologies and mechanical properties of high‐impact polystyrene (HIPS) and polycarbonate blends compatibilized with polystyrene and polyarylate block copolymer

Ohishi

Ikehara

Nishi

2001

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Phase morphology and mechanical properties of blends of high-impact polystyrene (HIPS) and polycarbonate (PC) blends compatibilized with a polystyrene (PS) and polyarylate (PAr) (PS-PAr) block copolymer were investigated. Over a broad range of composition from 50/50 through 30/70, HIPS/PC blends formed cocontinuous structures induced by the flow during the extrusion or injection-molding processes. These cocontinuous phases had heterogeneity between the parallel and perpendicular directions to the flow. The micromorphology in the parallel direction to the flow consisted of stringlike phases, which were highly elongated along the flow. Their longitudinal size was long enough to be longer than 180 m, while their lateral size was shorter than 5 m, whereas that in the perpendicular direction to the flow showed a cocontinuous phase with regular spacing due to interconnection or blanching among the stringlike phases. The PS-PAr block copolymer was found to successfully compatibilize the HIPS/PC blends. The lateral size of the stringlike phases could be controlled both by the amount of the PS-PAr block copolymer added and by the shear rate during the extrusion or injection-molding process without changing their longitudinal size. The HIPS/PC blend compatibilized with 3 wt % of the PS-PAr block copolymer under an average shear rate of 675 s Ϫ1 showed a stringlike phase whose lateral size was reduced almost equal to the rubber particle size in HIPS. The tensile modulus and yield stress of the HIPS/PC blends could be explained by the addition rule of each component, while the elongation at break was almost equal to that of PC. These mechanical properties of the HIPS/PC blends can be explained by a parallel connection model independent of the HIPS and PC phases. On the other hand, the toughness factor of the HIPS/PC blends strongly depended on the lateral size of the stringlike phases and the rubber particle size in the HIPS. It was found that the size of the string phases and the rubber particle should be smaller than 1.0 m to attain a reasonable energy absorbency by blending HIPS and PC.

show abstract

“…We carried out research and development on polystyrene–polyarylate (PS–PAr) block copolymers 6–12. In our earlier publications, we proposed a novel synthetic procedure of PS–PAr block copolymer utilizing a telechelic PS (Fig.…”

Section: Introductionmentioning

confidence: 99%

Phase morphology of polystyrene–polyarylate block copolymer/polycarbonate blends and their application to disk substrates

Ohishi¹,

Ikehara²,

Nishi³

2001

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Polystyrene-polyarylate (PS-PAr) block copolymer was applied as a moldability modifier of polycarbonate (PC). From the 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) extraction results, PS-PAr block copolymer was demonstrated to copolymerize with PC via an in situ reaction between the PAr chain and PC. As a result of the chemical bonding between PS and PC chains, the PS dispersed domain in the PS-PAr block copolymer/PC blend could be reduced, on average, to a size smaller than the visible light wavelength. In particular, by adjusting PAr composition to 30 wt % in the fed PS-PAr block copolymer during the melt-mixing process, the PS domain size was completely reduced to be smaller than the visible light wavelength. As a result the blend substrate could satisfy the transparency required for the optical disk substrate with higher memory density: homogeneity under polarizing light, clarity on the reflective plate, and transparency at 400 nm. The melt viscosity could be lowered to the equal viscosity level of PC at about 30°C higher temperature by blending PC 15 wt % with the PS-PAr block copolymer. The lowered melt viscosity could reduce the retardation in the optical disk substrate, which was equivalent to that of the PC substrate processed at 30°C higher. In addition, the PS-PAr block copolymer/PC blend could attain the exact groove transcription at 20°C lower mold temperature than that of PC as a result of the lowered elastic modulus caused by the PS-rich phase. These features of the PS-PAr block copolymer/PC blend indicated a potential to offer an improved process window for the substrate molding. Because of its excellent transparency and a potential for processing flexibility, the PS-PAr block copolymer/PC blend would be a promising material for optical disk substrates with higher memory density.

show abstract

Synthesis of styrene-acrylonitrile random copolymers (SAN) and polyarylate block copolymers and the control of their mechanical properties by morphology generation

Cited by 7 publications

References 24 publications

Morphology and mechanical properties of Acrylonitrile‐styrene‐acrylate toughened plastics with block copolymer chain structure

Morphology and mechanical properties of Acrylonitrile‐styrene‐acrylate toughened plastics with block copolymer chain structure

Phase morphologies and mechanical properties of high‐impact polystyrene (HIPS) and polycarbonate blends compatibilized with polystyrene and polyarylate block copolymer

Phase morphology of polystyrene–polyarylate block copolymer/polycarbonate blends and their application to disk substrates

Contact Info

Product

Resources

About