Rheology and microstructure of lithium lubricating greases modified with a reactive diisocyanate-terminated polymer: Influence of polymer addition protocol

Gow, 1997, Lubricating grease, 306 NLGI, Lubricating Greases Guide, National Grease Institute, Kansas, 1994. Al- Sammerral, 1986, Investigation of thermal degradation of polyethylene-polypropylene-based grease, J. Appl. Polym. Sci., 31, 1, 10.1002/app.1986.070310101 Verstrate, 1991, ACS Symp. Ser., 256, 10.1021/bk-1991-0462.ch015 Scharf, 1996, The enhancement of grease structure through the use of functionalized polymer systems, NLGI Spokesman, 59, 8 R. Scharf, S.R. Twining, P.R. Todd, US patent 6,300,288 (9/10/2001). Moreno, 2006, Use of reactive diisocyanate-terminated polymers as rheology modifiers of lubricating greases, Ind. Eng. Chem. Res., 45, 4001, 10.1021/ie0512441 Anzuino, 1975, Reaction of diisocyanates with alcohols. I. Uncatalyzed reactions, J. Polym. Sci. Part A: Polym. Chem., 13, 1657, 10.1002/pol.1975.170130716 Vandenabeele–Trambouze, 2001, Reactivity of organic isocyanates with nucleophilic compounds: amines; alcohols; thiols; oximes; and phenols in dilute organic solutions, Adv. Environ. Res., 6, 45, 10.1016/S1093-0191(00)00069-1 Garcia-Morales, 2004, Influence of processing variables on the rheological properties of lubricating greases manufactured in a stirred tank, J. Ind. Eng. Chem., 10, 368 Delgado, 2005, Relationship among microstucture, rheology and processing of a lithium lubricating grease, Chem. Eng. Res. Des., 83, 1085, 10.1205/cherd.04311 Franco, 2005, Mixing rheometry for studying the manufacture of lubricating greases, Chem. Eng. Sci., 60, 2409, 10.1016/j.ces.2004.10.042 Lapprand, 2005, Reactivity of isocyanates with urethanes: conditions for allophanate formation, Polym. Degrad. Stabil., 90, 363, 10.1016/j.polymdegradstab.2005.01.045 Yang, 1986, Thermal degradation of urethanes based on 4,4′-diphenylmethane diisocyanate and 1,4-butanediol (MDI/BDO), Polymer, 27, 1235, 10.1016/0032-3861(86)90012-1 Madiedo, 2000, Modeling of the non-linear rheogical behaviour of lubricating grease at low shear rates, J. Tribol., 122, 590, 10.1115/1.555406 Delgado, 2006, Influence of soap content and oil viscosity on the rheology and microstructure of lubricating greases, Ind. Eng. Chem. Res., 45, 1902, 10.1021/ie050826f Pretsch, 2001 Shuff, 1991, Imaging of lubricating oil insolubles by electron microscopy, Tribol. Int., 24, 381, 10.1016/0301-679X(91)90009-X Szycher, 1999 Bender, 1965, Mechanism of alkaline hydrolysis of p-nitrophenyl n-methylcarbamate, J. Org. Chem., 30, 3975, 10.1021/jo01022a528 Joel, 1994, Thermal-dissociation of urethanes studied by FTIR spectroscopy, Makromol. Chem., 217, 191, 10.1002/apmc.1994.052170116 Dusek, 1990, Network formation of polyurethanes due to side reactions, Macromolecules, 23, 1774, 10.1021/ma00208a036 Lu, 2002, Reactivity of common functional groups with urethanes: models for reactive compatibilization of thermoplastic polyurethane blends, J. Polym. Sci. Part A: Polym. Chem., 40, 2310, 10.1002/pola.10310