Styrene materials

Blends of PPO with a styrenic material, usually, but not always, high-impact polystyrene. (Referred to below as Styrenic PPOs.)... 

High-distortion temperature (HDT) of the styrenic materials is around 100°C. Blending with polymers of high HDT may lead to blends of high HDT. Both compatible and noncompatible polymers can be used judiciously for this purpose, e.g., PS is compatible with PPE (HDT = 220°C) [150] on a molecular level. Therefore, it is not surprising that a blend of HIPS with PPE will... 

Abscisic acid (ABA), 13 305 Abscission agent, ascorbic acid as, 25 761 ABS (acrylonitrile-butadiene-styrene) materials, producers and trademarks of, 10 207t. See also ABS polymers ABS resins Acrylonitrile-butadiene-styrene entries ... 

Absorption spectra, 23 3 of fats and oils, 10 822-823 of polymethine dyes, 20 506-512 Absorption spectroscopy, infrared reflection, 24 114-116 Absorption towers, in sulfuric acid manufacture, 23 779 Absorptive probes, 11 150 ABS polymers, 10 205-207. See also ABS (acrylonitrile-butadiene-styrene) materials... 

MABS polymers, 16 290. See also ABS (acrylonitrile-butadiene-styrene) materials... 

Commercially, the poly(styrene-b-elastomer-b-styrene) materials are made by anionic polymerization (7,45—47). An alkylhthium initiator (RLi) first reacts with styrene [100-42-5] monomer ... 

Vinblastine Sulfate Vinblastine sulfate loses its potency if stored along with 5% glucose solution in intravenous sets. This is maximum with cellulose propionate sets and minimum with methacrylate butadiene styrene materials. Solutions of this drug were more stable in polybutadiene tubing compared with PVC tubing. 

Further exploration [57] into the variation in properties available in the fully saturated poly(styrene-bl-butadiene-bl-styrene) materials focused on modifying the vinyl content in the polybutadiene block. Exploring practical elastomeric properties such as rebound and modulus, this work showed plainly that the level of vinyl in the polybutadiene block dominated the room temperature elastomeric properties of the block copolymer with a preferred level of about 40mol% percent 1,2-microstructure. 

Another family of important styrenic materials that are synthesized by grafting techniques, is that of acrylonitrile-butadiene-styrene (ABS) polymers. These are also thermoplastic materials like HIPS, but they exhibit improved impact and chemical resistance as well as... 

Fig. 4.69 Fatigue strength of acrylonitrile-butadiene-styrene materials in tension swell loading Ctsw at different load levels [12Els].

The styrene materials are commonly recycled in coimnunities where economics or legislation is favorable. However, where these materials are incinerated, PS, like PVC, causes unacceptable gaseous emissions and thus have come under intense environmental pressure and outright banning in some communities. 

The replacement of styrenic material has been substantial and covers a wide spectrum of applications ranging from automotive to appliance and packaging. The driving forces for this change include cost reduction, performance improvement, unification to monomaterial, weatherability, and chemical resistance. In the automotive area, the major driving forces have been unification of materials, noise reduction, thermal stability, and weatherability. The use of acrylonitrile butadiene styrene (ABS) resin in the interior of the vehicle, particularly in the automotive door panels and trim, package trays, and center consoles, has primarily been... 

Problems were being encountered in the metallization of a styrene material from one supplier but not from another, even though the compositions were supposed to be the same. By heating representative samples from the two suppliers and collecting the material vaporized from the surface on a KBr IR window, FTIR showed that one material was outgassing significantly more vapors than the other. 

In case of phosphate esters, their aggressiveness toward the styrenic materials is known. For example, tri-n-butylphosphate is one of the standard stress cracking agents, timed immersion into which is used to check Noryl (PPE-PS) for levels of frozen-in stresses. ... 

Two thermoforming case studies were used to illustrate ESC failiu es of styrenic materials from unexpected exposme to phosphate ester flame retardants. In the first... 

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