ENTC 281 exam 2 questions n answers 2023 already passed

ENTC 281 exam 2additives - correct answer use to improve of extend the properties of plastics antistatic agents - correct answer static charges may be dissipated by the addition of ? four types of colorants - correct answer dyes, organic pigments, inorganic pigments, special-effects pigments dyes - correct answer which colorant dissolves into the plastics material? organic dyes - correct answer poor thermal and light stability is a major disadvantage of this flexibility - correct answer plasticizers improve the ? of PVC c glass - correct answer what name is given to chemical-resistant glass fibers? crystal whiskers - correct answer single crystals used as reinforcements thixotropic - correct answer these fillers increase viscosity when not agitated diocotyl phthalate - correct answer one of the most widely used plasticizers ultraviolet light - correct answer name the type of light that is destructive to plastics catalysts - correct answer initiates polymerization chemical blowing agents - correct answer sometimes used to produce cellular plastics antioxidants - correct answer special stabilizers that retard or inhibit degradation through oxidation organic peroxides - correct answer curing agents used to cure unsaturated polyester reduce cost, reduce shrinkage, increase viscosity - correct answer three functions fillers provide in plastics organic filler - correct answer type of filler that cannot withstand high processing temperatures reinforcements - correct answer long fibrous ingredients that increase strength, impact resistance, and stiffness low cost, great strength, chemical resistance, electrical resistance - correct answer name four reasons glass fiber is often selected as a reinforcement rovings - correct answer long rope-like strands of fibrous glass lubricants and plasticizers - correct answer added to resins to lower viscosity and aid in processing zinc stearate - correct answer metallic soap additive that acts as a lubricant in molding fillers - correct answer small particles that contribute only slightly to strength