Solvent stress-cracking resistance

Polysulfone was also blended with PET for the purposes of cost reduction and improvement in solvent stress-crack resistance. The blend was developed in the glass-reinforced forms for applications in electrical and electronic markets (Mindel B, Amoco). However, the DTUL, flexural strength, and impact strength of this PSU/PET blend were inferior to those of PET at comparable levels of glass reinforcement and hence no longer offered. 

TPUs and polycarbonate blends and TPU/polycarbonate/ABS blends are used with the addition of the polycarbonate giving higher modulus and solvent stress cracking resistance as well as making processing of the TPU much easier. TPU/polycarbonate/polybutylene terephthalate blends are superior to their ABS analogue for resistance to environmental stresscracking resistance. 

PVC Better clarity Better processing window Better weather resistance Worse environmental acceptance Lower solvent stress crack resistance Lower heat deflection temperature... 

Glass-reinforced ABS possesses the best balance of properties of the styrene polymer family. They can be formulated for excellent impact and creep resistance. Glass-reinforced ABS formulations for electroplating are also available. These combine platability with improved solvent stress-crack resistance. 

Ethylene-vinyl acetate EVAs (in the polyolefin family) have exceptional barrier properties, good clarity and gloss, stress-crack resistance, low temperature toughness/retains flexibility, adhesion, resistance to UV radiation, etc. They have low resistance to heat and solvents. 

PP/PA (polypropylene/polyallomer). These plastics are similar to polyethylene, but each unit of their chains has a methyl group attached. They are translucent, autoclavable, and have no known solvents at room temperature. They are slightly more susceptible than polyethylene to strong oxidizing agents. They offer the best stress-cracking resistance of the polyolefins. Products made of polypropylene are brittle at ambient temperature and may crack or break if dropped from benchtop height. 

PARA with PAr are miscible processability, mechanical properties, solvent, weather, HDT, impact and stress-crack resistance Bapat et al., 1992... 

PA/PAr or PA/PEST PA-co-PAr Good processability, mechanical properties, UV stability, heat, solvent, and stress-crack resistance. Dean, 1990. 

PSF/PET blends show a dispersed morphology. The combination of crystalline PET and amorphous polysulfone provides chemical resistance and warp-free properties. The amount of crystalline polymer is varied to meet requirements in thermal properties and the level of reinforcement is varied to tailor the modulus. The blends have electrical and mechanical properties similar to PET but only a third of its shrinkage and warpage. Also, stress crack resistance to common solvents is improved. Similarly, the service T is upgraded compared to PET. The blends are formed by injection molding and extrusion. 

The radiation synthesis of polymeric nanocomposites is one of the promising technologies in the production of polymeric nanomaterials (Taleb et al. 2012). Along with the polymerization of monomers in situ (Liu et al. 2001, Meszaros and Czvikovszky 2007), radiation-induced cross-linking leads to the reinforcement of the available polymeric matrix owing to additional bond formation both between polymer chains of the matrix (Glhsel et al. 2003, Sharif et al. 2007) and between the polymer matrix and filler particles (KrkljeS et al. 2007, Planes et al. 2010). It is a very useful technique to improve the thermal stability, stress crack resistance, solvent resistance, and... 

Polybutylene has an upper temperature limit of 200°F (93°C). It possesses a combination of stress cracking resistance, chemical resistance, and abrasion resistance. It is resistant to acids, bases, soaps, and detergents. Polybutylene is partially soluble in aromatic and chlorinated hydrocarbons above 140°F (60°C) and is not completely resistant to aliphatic solvents at room temperature. Chlorinated water will cause pitting attack. Refer to Table 2.18 for the compatibility of polybutylene with selected corrodents. PB is subject to degradation by UV light. 

Polyethersulfone Thermoplastic aromatic polymer has good heat and fire resistance, transparency, dielectric properties, dimensional stability, rigidity, and toughness, but poor solvent and stress cracking resistance, processibility, and weatherability. Processed by injection, blow, and compression molding and extrusion. Used in high temperature applications, electrical devices, medical devices, housings, and aircraft and auto parts. Also called PES. 

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