Effect of rubber types on synthesis, morphology, and properties of ABS resins

Abstract

A series of acrylonitrile-butadiene-styrene (ABS) copolymers were prepared using lithium-catalyzed low-cis rubber (PB700A), nickel-catalyzed high-cis rubber (BR9004), and their compounded rubber (PB700A/ BR9004 = 50:50) as toughening agents through bulk polymerization. The effects of molecular structures of rubbers on the dissolving and grafting process of them were investigated. The structure and properties of ABS resins were characterized with FTIR, TEM, and performance measurements. It is shown that the characteristics of rubbers affect their dissolving state and grafting reaction and consequently influence the morphology and properties of ABS materials. BR9004 promotes the formation of irregular microsized rubber particles with special ''salami''-like structure and, therefore, presents better mechanical properties. PB700A has much higher 1,2-isomers, which benefits its dispersion and grafting reaction; its toughening effect, however, is unsatisfactory and can be improved by the incorporation of BR9004. FIG. 4. TEM micrographs of ABS-1 toughened by low-cis PB700A (a) bar ¼ 2 lm and (b) bar ¼ 0.5 lm.

Instrumented impact property and fracture process behavior of composite rubber toughened abs terpolymer

“…Figure 1 shows the typical TEM micrographs of samples toughened by different rubber usage and Ni‐9004/Li‐700A ratio. As our previous study, Li‐700A toughened terpolymer had uniformly fine rubber particles with plenty of SAN subinclusions and relatively fuzzy two‐phase interface, whereas Ni‐9004 toughened product owned certain microsized irregular particles with heterogeneous distribution and relatively clear boundary 14. As can be seen from Figure 1, all images display the common characteristics of Li‐700A and Ni‐9004.…”

“…Details for the preparation of the various ABSs can be referred in a previous paper 14. Briefly, rubber dissolution was performed in nitrogen atmosphere at room temperature for 12 h, and bulk polymerization was conducted for 4 h at 105°C with a stirring speed of 375 rpm and another 5 h at 150°C.…”

“…So, it is of significance to investigate the influence of compounded rubber on toughness and fracture mechanisms. Although different rubber types in toughened thermoplastics (ABS) have been researched in previous studies,13–18 limited analyses or pertinent reports on the fractography and fracture mechanism of compounded rubber systems under instrumented impact event have been undertaken. This article focuses on the investigation of fracture process behaviors and mechanisms of low‐ cis ‐1,4/high‐ cis ‐1,4 polybutadiene (PB) rubber cotoughened materials via instrumented Izod impact testing and morphological examination of fractured surfaces.…”

The Graft Copolymerisation of Block Styrene Butadiene Rubbers with Acrylonitrile and Styrene

“…In the experiment with BSBR-1, phase inversion occurs in two stages from 125 to 145 min. It is known [4] that lower dynamic viscosity and molecular weight of the rubber promote its more rapid dissolution in styrene, as a result of which the rubber is dispersed well in the solvent, having a smaller particle diameter and a greater surface area. In the industry, the optimum rubber particle size and distribution in the matrix of highimpact copolymers are achieved in different ways: by the selection of the mixing conditions and different types of initiator, and by using different types of rubber [1].…”

Reciclagem do copolímero acrilonitrila-butadieno-estireno e do poliestireno de alto impacto oriundos de rejeitos de equipamentos elétricos e eletrônicos na forma de blendas poliméricas

“…A identificação inicial dos polímeros presentes em REEE pode ser feita através de siglas ou números de identificação, regulamentados pela norma ABNT Outras técnicas mais sofisticadas como espectroscopia no infravermelho com transformada de Fourier (FTIR) e espectroscopia Raman podem ser utilizadas para diferenciar os polímeros ABS e HIPS (YU et al, 2009;SADEGHI et al, 2003).…”