Kinetic and Viscosity Relations for Thermosetting Polyurethanes
نویسندگان
چکیده
منابع مشابه
Structure-property studies of thermoplastic and thermosetting polyurethanes using palm and soya oils-based polyols.
Palm and soya oils were converted to monoglycerides via transesterification of triglycerides with glycerol by one step process to produce renewable polyols. Thermoplastic polyurethanes (TPPUs) were prepared from the reaction of the monoglycerides which act as polyol with 4,4'-methylenediphenyldiisocyanate (MDI) whereas, thermosetting polyurethanes (TSPUs) were prepared from the reaction of glyc...
متن کاملKinetic theory viscosity
We show how the viscous evolution of Keplerian accretion discs can be understood in terms of simple kinetic theory. Although standard physics texts give a simple derivation of momentum transfer in a linear shear flow using kinetic theory, many authors, as detailed by Hayashi & Matsuda 2001, have had difficulties applying the same considerations to a circular shear flow. We show here how this ma...
متن کاملBeyond kinetic relations
In this paper we discuss a new concept of a constitutive kinetic equation which represents a quasicontinuum analog of the conventional continuum mechanical concept of a kinetic relation. Kinetic relations link the velocity of the defect with the driving force and are widely used to model dynamical response of dislocations, cracks and phase boundaries. To illustrate the difference between kineti...
متن کاملBeyond kinetic relations
We introduce the concept of kinetic or rate equations for moving defects representing a natural extension of the more conventional notion of a kinetic relation. Algebraic kinetic relations, widely used to model dynamics of dislocations, cracks and phase boundaries, link the instantaneous value of the velocity of a defect with an instantaneous value of the driving force. The new approach general...
متن کاملKinetic theory of viscosity of compressed fluids.
THE VISCOSITY OF A COMPRESSED GAS IS A FUNCTION OF THREE VARIABLES: (1) the degree of crowding of the molecules; (2) their capacity, by reason of softness, flexibility, or rotational inertia, to absorb the vector momentum applied to cause flow; (3) the resistance to this vector momentum offered by the randomly oriented thermal momenta, which becomes significant when the liquid expands sufficien...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Polymer Journal
سال: 1983
ISSN: 0032-3896,1349-0540
DOI: 10.1295/polymj.15.9