ADDITIVES | COMPATIBLISERS


Figures 1 and 2: Measured tensile and impact strength of PC/ABS blends produced using different compatibilisers (1


/8


-inch thick


sample). Sample 1 contains no compatibliser, sample 2 0.03phr SAG,001, sample 3 0.5phr SAG-001, sample 4 0.5phr SAG-005, and sample 5 0.5phr SAM-002


Development Manager at Polyscope. He says his company “is eager to support the industry with fresh thinking by supplying state-of-the-art additives, which can offer optimised blend properties.” Polyscope set out as a supplier of styrene maleic anhydride (SMA) but Doelen says it is now expand- ing its portfolio in recognition of the growing need to optimise polymers. The first step was the introduction of styrenics with GMA, part of the Xibond family. The Xibond portfolio consists of products that will affect blend morphology or surface characteristics. It encompasses compatibi- lisers, coupling agents, chain extenders, viscosity modifiers and surface modifiers. Xibond functional styrenics are especially suitable for polymer blends


Table 1: Mechanical and thermal properties of PC/ABS blends produced using different compatibilisers (all based on a 70/30 blend of PC/ABS)


Property Sample No


No Compatibiliser SAG-001 SAG-001 SAG-005 SAM-002


Tensile strength Flexural strength Impact strength (1 Impact strength (1 Melt Index HDT


56 82


/8 /4


”) ”)


514 180 29


118 Source: Fine Blend 70 COMPOUNDING WORLD | May 2018 1 2 0.3 phr 0.5 phr 0.5 phr


57 83


584 286 24


121


57 82


602 301 24


121


58 83


628 309 23


122


0.5 phr 58 82


594 227 25


120


Value 3


4 5 Source: Fine Blend


containing styrenics based polymers such as ABS, HIPS and ASA, Doelen says.


Xibond can also act as a coupling agent for


fillers. “The functional groups in the Xibond coupling agent range can interact with the reactive groups, such as –OH and –NH2,


present in the filler,”


says Doelen. The interaction between the polymer matrix and the filler is dependent on the sizing or the end groups of the filler. Doelen says PolyScope is also addressing issues


of compatibility on a larger scale. “The surface properties of plastics are critical for many second- ary operations, such as painting, gluing and over-moulding,” he says. “The addition of Xibond can modify the surface properties of polymer matri- ces by incorporating functional groups on the surface. These functional groups will increase the surface tension and will lead to increased adhesion properties that can be beneficial for specific secondary operations.” The company’s principal focus is on TPE/PA


over-moulding for soft touch applications. “When 2K-injection moulding is applied, the PA substrate is still hot when the SEBS soft-touch layer is injected. Consequently, it is relatively easy to get good adhesion with the aid of the typical adhesion promotors such as MA-grafted SEBS or MA-grafted PP,” Doelen says. “However, in the case of sequential over-mould-


ing, the PA substrate is at ambient temperature when the soft touch SEBS layer is injected onto the substrate. In this case, typical adhesion promotors cannot provide sufficient adhesion and stronger reactivity is required to get the desired level of adhesion between the PA substrate and the SEBS. But Xibond 180 delivers the required reactivity


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