ADDITIVES | COMPATIBLISERS
Compatibilisation of a PP/SEBS-blend using a tailor-made SEB-diblock copolymer Source: Fraunhofer IHB
Below: Compatibiliser selection can play a part in improving performance and processing of PC/ABS blends
Compatibilising PC/ABS Hao Duan at Chinese company Fine-Blend Com- patibilizer Jiangsu recently teamed up with Min Qi Xin from Shanghai Kumhosunny Plastics to study the effect of different compatibilisers on the properties of PC/ABS alloys. The two evaluated two compatibi- lisers consisting of a styrene-acrylonitrile-glycidyl methacrylate (SAG) terpolymer with different contents of glycidyl methacrylate (GMA) – SAG-001 and SAG-005 – and styrene-acrylonitrile-maleic anhydride terpolymer (SAM) – SAM-002 – in a 70/30 PC/ABS alloy. They measured effects on mechanical properties, thermal stability and phase morphology. The tensile strength of SAG-modified and SAM-modified alloy samples (1/8-inch thick) were all higher than an unmodified PC/ABS blend, but there was little difference between them (Figure 1). Impact strength was also higher for the compatibi- lised blends, with the type and concentration of compatibiliser having a more noticeable influence – the impact strength of SAG modified blends was higher than the SAM-modified blend at the same addition level (Figure 2). In addition, the research- ers found that SAG reduced melt flow, implying that the molecular weight of the system increased.
The HDT (heat distortion temperature) also improved with the SAG-modified system (Table 1). Moreover, the phase morphology of the
SAG-modified PC/ABS alloys was much better than that of the SAM-modified system. “As a conse- quence, SAG compatibilised PC/ABS alloy showed better properties than those of SAM modified system, suggesting that the reaction between carboxylic or epoxy groups in SAG and terminal carboxyl group in PC would be the main factor to bring the enhancement in the mechanical, thermal and morphological properties of the PC/ABS alloy,” the researchers say. Polycarbonate was sourced from Honam
Petrochemical Company of Korea and ABS was purchased from Sinopec in China. The two styrene- acrylonitrile-glycidyl methacrylate (SAG) terpoly- mers, with GMA contents of 1% and 5% respec- tively, are products of Fine-Blend itself. The styrene-acrylonitrile-maleic anhydride (SAM) terpolymer (2% of MAH content) was also a Fine-Blend product. The researchers found that the tensile strength
of compatibilised PC/ABS alloy slightly increased, but the two compatibilisers barely affected the flexural strength of the system. They concluded that the reactivity between the GMA in SAG and the terminal carboxyl group of polycarbonate was the main factor for not only improving the mechanical and thermal property, but also enhancing the phase morphology of PC/ABS alloys. The full technical paper can be downloaded HERE.
http://www.compoundingworld.com/fb_sag
Engineering solutions The engineering plastics landscape contains a variety of polymers, each with its own characteristics. “Over the last decade the landscape has more or less settled and product developers nowadays are looking to upgrade or combine the current product offering,” says Ardy Doelen, Sales & Business
68 COMPOUNDING WORLD | May 2018
www.compoundingworld.com
PHOTO: SHUTTERSTOCK
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