Phase separation of some acrylonitrile—butadiene—styrene resins

ABSTRACT:The graft copolymerization of maleic anhydride (MAH) onto acrylonitrile-butadiene-styrene terpolymer (ABS) was carried out with dicumyl peroxide (DCP) and benzoyl peroxide (BPO) as the binary initiators and with styrene as the comonomer in the molten state. IR spectra confirmed that MAH was successfully grafted onto the ABS backbone. A reaction mechanism was proposed: the grafting most likely took place through the addition of MAH radicals to the double bond of the butadiene region of ABS. Influences such as the MAH concentration, the initiators and their concentrations, the reaction temperature, the rotating speed, and the comonomer concentration were studied. The results indicated that using styrene as a comonomer and DCP/BPO as binary initiators was beneficial for the graft copolymerization.

Section: Phase Separation Of Abs and Grafted Absmentioning

confidence: 99%

Modification of acrylonitrile–butadiene–styrene terpolymer by grafting with maleic anhydride in the melt. I. Preparation and characterization

Qian

Zhou

2003

“…Gesner studied the solvent extraction method. 2 He examined several solvents to extract different phases from ABS. The most satisfactory separation was done with xylene, cyclohexane, and acetone.…”

Section: Introductionmentioning

confidence: 99%

Characterization of rubber phase in acrylonitrile–butadiene–styrene polymers

Zamani

Abbasi

Agah

2009

The performances of rubber-toughened polymers like acrylonitrile-butadiene-styrene (ABS) are strongly affected by the type and amount of rubber phase. Characterization of rubber phase is an effective method to predict and control the physical and mechanical behaviors of ABS materials. In this work, different methods have been employed to determine the amount of rubber phase in ABS polymers. The first method was based on thermogravimetry using a particular step degradation of the polymer. In the second method, characteristic absorption bands in the Fourier transform infrared spectra were used to make a calibration curve to determine the rubber content of unknown ABS samples. The third method was based on variation of heat capacity of ABS polymers with increasing the rubber phase content. In the fourth method, a two-step solvent extraction followed by centrifuging was used to separate the rubber particles of different ABS samples. Separation of hardened rubber particles was used to study the size and size distribution of rubber particles.

“…ABS materials consist of a butadiene rubber embedded within a matrix of styrene-acrylonitrile copolymers (SAN), some of which were chemically grafted to the rubber (another type of ABS is a nitrile rubber-modified SAN resin made by simply blending the two copolymers). 2 Blends of nylon and ABS materials are of significant commercial interest because of ABS materials' excellent toughness, dimensional stability, and relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

Effect of dynamic vulcanization on properties and morphology of nylon/SAN/NBR blends: A new compatibilization method of nylon/ABS blends

Wang

Zhang

et al. 2003

Dynamically vulcanized blends of nylon, styrene-acrylonitrile copolymer (SAN), and nitrile-butadiene rubber (NBR) were examined for mechanical properties, Shore D hardness, Vicat softening temperature, impact process, and phase morphology. The effect of a curing system such as phenolic formaldehyde resins (PF), dicumylperoxide (DCP), and a sulfur system on the mechanical properties of the nylon/SAN/NBR blends was studied, and dynamic vulcanization with a PF system was found to lead to outstanding toughness of the blends. The effect of PF content on the mechanical properties, Shore D hardness, and heat resistance of the nylon/SAN/NBR blends was also investigated. With increasing PF content the notched-impact strength and Vicat softening temperature (VST) of the nylon/SAN/NBR (50/25/25) blends evidently improved, but tensile strength and Shore D hardness of the blends changed slightly. It can be concluded that the nylon/SAN/NBR (50/ 25/25) blends dynamically vulcanized by high-content PF can attain excellent comprehensive mechanical properties, especially supertoughness, at room temperature. SEM was used to investigate the effect of dynamic vulcanization on disperse-phase particle size, particle size distribution, and phase morphology. It was obvious that disperse-phase particle size decreased with an increasing PF content. Thermal behavior and miscibility of dynamically vulcanized nylon/ SAN/NBR with PF were investigated by DMTA.