Impact-modified SPS

Figure 13.19 Map of the dielectric properties of plastics (bulk samples). IMSPS, impact-modified SPS IRGFSPS, ignition-resistant GFSPS. PC polycarbonate PPE poly(phenylene ether) PE polyethylene PAr polyarylate PFS polysulfone.

Impact-modified SPS/nylon blend that is CompatibUized with a compatibilizer that can react with nylon and is compatible with SPS A process for making an SPS/nylon blend containing block copolymer A vibration damping engineering plastic A flame-retardant SPS/nylon blend... 

SPS/nylon blends with functionalized reinforcement SPS/nylon blend with styrenic block copolymer SPS/nylon blend with impact modifier and optionally filler A process for making a nanocomposite masterbatch Impact-modified SPS/nylon blend with reinforcement and mineral filler for improved gloss... 

Chapter 13) and continues with melt processing, including injection molding, extrusion, films, and fibers (Chapter 14). Chapter 15 goes on to describe applications of SPS polymers themselves, followed by a discussion of blends with polyamides in Chapter 16 and with conventional polystyrenes in Chapter 17. Compatibilizers for impact-modified SPS are covered in Chapter 18. 

Figure 18.18 Map of dielectric properties of engineering plastics. Among engineering plastics, SPS (impact modified and GF-reinforced HB and IR grades) has very low dielectric dissipation factor and dielectric constant following those of fluorocarbon polymers. PSF, polysulfone PPE, poly(phenylene ether) PES, poly(ether sulfone) PAr, polyarylate...

Volume average Izod notched impact Modulus in SPS (wt%) Impact modifier particle size (pm) strength (kgcm/cm) tension (kg/cm2)... 

The use of olefin rubbers [18] as good impact modifiers for sPS when used in conjunction with S-B or S-B-S block copolymers, which may be hydrogenated in the butadiene phase, has also been described. Instead of butadiene, isoprene can be used. Examples of the olefinic polymers are polyethylene, ethylene-propylene rubbers (EPR) and polypropylene-(ethylene propylene rubber) block copolymers. Here the styrene block copolymers presumably function as... 

Instead of block copolymers, the use of pseudo-random linear copolymers of an aliphatic a-olefin and a vinyl aromatic monomer has been reported [20], where the styrene content of the polymer must be higher than 40 wt%. Preferred are styrene and ethylene copolymers. These blends may contain, amongst other things, an elastomeric olefinic impact modifier such as homopolymers and copolymers of a-olefins. Presumably the styrene-ethylene copolymer acts as a polymer emulsifier for the olefinic impact modifier. Using 5 wt% of an ethylene-styrene (30 70) copolymer and 20% of an ethylene-octene impact modifier in sPS, a tensile elongation (ASTM D638) of 25 % was obtained. 

The use of core-shell impact modifiers for sPS is also patented in EP 318793 [15] (see Table 19.1). These impact modifiers are usually prepared using the emulsion polymerization process, although other methods such as the microsuspension polymerization process are possible. The core usually consists of polymers prepared from an acrylate, especially butyl or 2-ethylhexyl acrylate or butadiene. These rubber particles are then grafted with vinyl monomers, where... 

The use of core-shell impact modifiers combined with styrene-hydrogenated poly butadiene block copolymers in sPS is described by Rohm and Haas [24]. The core of the former type is of polybutadiene or its copolymer, the shell consists predominately of polystyrene. Rohm and Haas found that a synergistic effect is present and that the Izod notched impact strength is higher when both rubber types are used instead of only one. 

Uses Monomer for solv.-resist. elastomers, polyacrylate rubbers, UV-curable reactive diluent, soft contact lenses, PVC impact modifier, fabric coatings, barrier coatings for polyethylene, textile coatings Properties APHA 50 color m.w. 130.15 sp.gr. 1.012 (20/20 C) flash pt. 82 C 98.5% act. 

In some cases, the SPS/nylon compositions include olefinic impact modifiers that are compatibilized with the matrix nylon via a maleic anhydride-functionalized olefin. The concept is that the maleic anhdydride portion of the molecule reacts with the nylon, and the olefin part of the molecule is miscible with the olefin impact modifier. 

SPS/nylon blends impact modified with maleic anhydride-fnnctionalized poly (styrene-b-(ethylene-co-butylene)-b-styrene) MA-SBS, or MA-SEBS... 

SPS/nylon blends impact-modified with oil extended impact modifier and containing domain-forming agent Brominated SPS/nylon blends... 

A thermally developable photosensitive layered material SPS/nylon blends impact-modified with a rubber having a specific... 

Figure 163 Apparent shear viscosity versus apparent shear rate for 30% glass fiber-reinforced SPS/nylon, PBT, impact-modified (IM) SPS, and nylon at mid-range processing temperatures.

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