Nylon injection molding

Reaction Injection Molding. RIM uses the anionic polymeri2ation of nylon-6 to carry out polymeri2ation in the mold. A commercial process involves the production of block copolymers of nylon-6 and a polyether by mixing molten caprolactam, catalyst, and polyether prepolymer, and reacting in a mold (27,28). 

Reaction-Injection Molding and Reactive Casting. Reaction-iajection molding (RIM) (22) and reactive casting (23) have been demonstrated on nylon-6, which is polymerized by catalytic ring opening and linear recondensation of S-caprolactam (qv) (24). 

Injection molding The RTPs (reinforced thermoplastics) are practically all injection molded with very fast cycles using short glass fiber producing highly automated and high performance products. The TPs used include nylons, acetals, polyethylenes, and polypropylene. Of all the RP materials used, about 55wt% represent these RTPs. 

Capron Nylon Troubleshooting Guide for Injection Molding... 

Injection Molding Processing Guide for Capron Nylon... 

RCM. See Ring-closing metathesis (RCM) Reaction by-products, removing, 83 Reaction extrusion, 204 Reaction index, 237 Reaction injection molding (RIM), 205 Reaction-in-mold (RIM) nylon, 149 Reaction kinetics, 76, 77 Reaction mechanisms, polyesterification, 66-69... 

We can nucleate crystallization from the melt by incorporating finely ground inorganic crystalline compounds such as silica. Nucleation of injection molded nylons has three primary effects it raises the crystallization temperature, increases the crystallization rate, and reduces the average spherulite size. The net effect on morphology is increased crystallinity. This translates into improved abrasion resistance and hardness, at the expense of lower impact resistance and reduced elongation at break,... 

Jao, S.H. and McGarry, F.J. (1992b). Interphase bond strength and energy absorption of injection-molded rubber coated glass/nylon composites. J. Reinforced Plast. Composite II, 811-835. 

Write out the complete reactions for polyurethane production starting with toluene, natural gas, air, water, and salt, as sketched in Figure 11-8. Use 1,4-butane diol for the glycol starting from butane. Why is this process preferable for reaction injection molding of automobile parts compared to Nylon or PET ... 

An injection molded bar contains 20% by volume of short carbon fibers in a matrix of nylon 6,6. Take the tensile strengths of the carbon fibers and the nylon to be 3200 MPa and 70 MPa, respectively, and assume the shear strength of the carbon fiber-nylon interface to be 32 MPa. The tensile moduli of nylon 6,6 and carbon fibers are 2.7 GPa and 230 GPa, respectively. Assume that the fibers are all of length 400 p.m and diameter 6 p.m and are perfectly aligned along the axis of the bar. 

Nylon-6 can also be produced from molten caprolactam using strong bases as catalysts (anionic polymerization) this is used as the basis of monomer casting and reaction injection molding (RIM). Anionic polymerization proceeds much faster than the hydrolytic route but products retain catalysts which may need to be extracted. 

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