High-impact PS

Property Polystyrene (PS) Poly(styrene-i) (j-acrjio-nitrile ) (SAN) Glass-fil led PS High impact PS HIPS Acrylonitrile— butadiene—styrene terpolymer (ABS) Type 1 Type 2 Standard ABS Super ABS... 

Property Units G.P. polystyrene Medium-impact PS-SBR blend Very high impact PS-SBR blend Styrene acrylonitrile Medium impact ABS High impact ABS MBS... 

In summary, the attributes of the elastomer that contribute to the enhanced impact strength of a plastic in plastic mbber blend include the type of mbber, plastic to mbber ratio, particle size, particle size distribution, cross-Unk density, and degree of grafting, if any. Molecular weight and molecular weight distribution of the plastic also exert some influence. For example, for high-impact PS, the optimal molecular weight of PS is between 170,000 and 220,000. The dispersity index is... 

A stndy was made of the effects of foam formulation and process conditions and liner composition on the adhesion of HCFC-141b blown rigid PU foam thermal insulation to refrigerator liner protective layers made of ABS, high-impact PS (HIPS), PE and blends of HIPS and PE containing a compatibiliser and adhesion promoter. A tensile test was used to quantify the level of adhesion before and after thermal cycling, and the Brett mould was used for laboratory simulations of foam adhesion within... 

Fosta Tuf-Flex High-impact PS Foster Grant... 

Superflex Grafted high-impact PS Gordon Chemical... 

Many engineering thermoplastics such as nylon, high-impact PS, polyesters, and toughened plastics exhibit responses similar to those shown in the next two curves in Figure 3.3, designated ductile. Here the stress achieves a maximum called a yield stress at a specific strain. As strain increases beyond... 

Thus commercial atactic PS is transparent, but isotactic PS is translucent because of some amorphous areas present in the highly crystalline product. Also, high-impact PS is translucent because of the presence of two phases. 

Cavitation in the rubber particles of PS/high-impact PS (HIPS) was also identified as a heterogeneous nucleation site, using batch-foam processing [15, 16]. The experimentally observed cell densities as a function of the temperature, the rubber (HIPS) concentration, the rubber particle size, and saturation pressure were found to be in good agreement with the proposed nucleation model. Similar nucleation mechanisms of elastomeric particles were claimed for acrylic and di-olefinic latex particles in various thermoplastics [17, 18]. 

Electrodes in a capacitively coupled conductivity detector were made by injection molding carbon-filled polymer into a preformed PS chip. The polymer consisted of three conducting formulations 8% carbon black filled PS, 40% C fiber filled nylon-6,6, and 40% C fiber filled high-impact PS [774]. In another report, a movable contactless conductivity detector was also developed to allow the distance of the electrode to be adjustable [775],... 

Amorphous, glassy polymers, used far below their Tg, are cold-brittle if no other mechanisms are active an example is PS. If a polymer has been improved in impact strength by the addition of a rubbery phase (high-impact PS or PVC, ABS etc.), then the cold-brittleness temperature is related to the Tg of the added rubber. If the polymer shows a secondary transition in the glassy region (such as PC), then this governs the brittleness temperature. 

If the hard blocks are longer than the soft ones, such as in SBS with a high styrene content, the hard phase will be continuous, and the rubbery phase is present as domains (see Figure 9.6). In such a case SBS behaves as a high-impact PS. Another example of this type is a PP/EP block copolymer tails of EP (random copolymer of ethylene and propylene) on the PP chains segregate into rubbery domains in the PP matrix, which improve the impact strength. 

Through polymerization of a styrene rubber solution, one obtains SB mass (styrene-butadiene). SB forms a twophase system in which the styrene is the continuous phase and the rubber, usually a butadiene base, is the discontinuous phase. The rubber phase also contains pockets of styrene. The SB polymer, because of its properties, is also known as impact resistant or high impact PS (HIPS). 

Description The production of general purpose PS (GPPS) and high-impact PS (HIPS) is essentially the same with the exception of the initial, rubber-dissolution step for HIPS. 

NSCC/UOP Polystyrene Styrene Sophisticated reactor design for production of high-performance general purpose and high-impact PS resins 2 NA... 

There are certain kinds of PS that are used in food containers, such as general-purpose PS (GPPS), high-impact PS (HIPS), EPS and PS paper (PSP). In these studies, the content of SDs and STs did not always depend on the type of PS. However, in other studies investigating various types of PS containers for instant foods, the contents of SDs and STs in EPS, for example, Chinese noodles Nos 1-3 and soup Nos 1-5, showed were very low (Table 31.4). The sum of SDs and STs ranged from 60 to 130 and from 370 to 680 jxg/g, respectively. As polymerization of EPS is a low-temperature reaction, it was expected that only traces of by-products of polymerization would remain [6]. 

Two examples are shown in Figs. 25 and 26, where Qc and Ojlhrij are plotted as a function of 2. In the first case we compare interfaces between an epoxy and either PS or high-impact PS, where both interfaces have been reinforced with the same deuterated end-grafted chain, while, in the second case, we compare interfaces between polyamide 6 (PA-6) and either polypropylene (PP) or a PP-based alloy with a PP matrix and 70% EPDM rubber particles, where both interfaces have been reinforced with the same type of grafted PP chains. Two observations can be made ... 

Bis(tetrabromophthalimide)ethane BT 93 BT-93D BT 93W CCRIS 6188 Qtex BT 93 EINECS 251-118-6 2,2 -(1,2-Ethanediyl)bis(4,5,6,7-tetrabromo-1 H-isoindole-1,3(2H)-dione) N,N -Ethylenebis(3,4,5,6-le1rabromo-phthalimide) 1H-lsoindole-1,3(2H)-dione, 2, -(1,2-ethanediyl)bis(4,5,6,7-tetrabromo-] Phthalimide, N.N -elhylenebis(telrabromo- Saytex BT 93 Saytex BT 93W. Flame retardant for high-impact PS, polyethylene, PP, thermoplastic polyesters, nylon, EPDM, rubbers, PC, ethylene copolymers, ionomer resins, textile treatment Solid mp = 446" SG = 2.67 ... 

Table III summarizes the most important physical-mechanical properties, as determined by ASTM methods, of high impact PS and PVC with EPDM type C elastomer contents of 10% and 9.2% respectively (see Experimental section above for preparative techniques). These products are characterized in Table IV.

The high-impact PS, HIPS, has been known since 1911 [Matthews, 1911, 1913]. In the USA, Ostromislensky [1924, 1926-28] patented copolymerization of styrene with rubber, balata or other elastic and plastic gum . Production of HIPS, Victron , by the Naugatuck Chemical started in 1925, but soon it was discontinued. 

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