Processing of polyurethane/polyester interpenetrating polymer networks by reaction injection molding. Part III: Flow reorientation through multiple impingement

1986 ◽  
Vol 26 (12) ◽  
pp. 843-853 ◽  
Author(s):  
Luu T. Nguyen ◽  
Nam P. Suh
Keyword(s):  
Injection Molding ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Reaction Injection Molding

LABORATORY-SCALE REACTION INJECTION MOLDING OF POLY(CAPROLACTONE) ELASTOMERS FOR RAPID PROTOTYPING OF STIMULI-RESPONSIVE THERMOSETS

2017 ◽  
Vol 90 (2) ◽  
pp. 337-346
Author(s):  
Yuan Meng ◽  
Xin Huang ◽  
Cynthia Fitzgerald ◽  
Hojun Lee ◽  
Jeh-Chang Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Material Processing ◽  
Injection Molding ◽  
Scale Up ◽  
Polymer Networks ◽  
Laboratory Scale ◽  
Feed Stream ◽  
Stimuli Responsive ◽  
Reaction Injection Molding ◽  
Poly Caprolactone

ABSTRACT Semicrystalline polymer networks offer valuable shape-memory and shape-shifting properties; however, material processing and scale-up remain major challenges. A laboratory-scale reaction injection molding (RIM) apparatus and methodology are described to mold and cure urethane linked poly(caprolactone) networks from commercially available polyols and polyisocyanate. The highly customized RIM system is capable of making small shot sizes (∼39 g) at precise stoichiometric ratios and forming elastomers with low run-to-run variation of mechanical properties. Experiments conducted with a dye in one feed stream enable evaluation of mixing efficacy, and component mixing is substantially improved by recirculating reagents at higher pressures. Networks prepared with excess isocyanate exhibited higher modulus, which is most likely due to the formation of allophanates.

scholarly journals The microscopic distribution of hydrophilic polymers in interpenetrating polymer networks (IPNs) of medical grade silicone

Polymer ◽  
2021 ◽  
Vol 224 ◽  
pp. 123671
Author(s):  
Gregory N. Smith ◽  
Erik Brok ◽  
Martin Schmiele ◽  
Kell Mortensen ◽  
Wim G. Bouwman ◽  
...  
Keyword(s):  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Hydrophilic Polymers ◽  
Microscopic Distribution ◽  
Medical Grade
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