Results 241 to 250 of about 40,750 (298)

Non-isothermal crystallization of polymers

Progress in Polymer Science, 1999
Abstract Traditional studies of crystallization kinetics are often limited to idealized conditions, in which the parameters of state (temperature, pressure, etc.) are constant. In real situations, however, the external conditions change continuously, which makes the kinetics of crystallization dependent on instantaneous conditions, as well as on rate
Maria Laura Di Lorenzo, Clara Silvestre
exaly   +3 more sources

Non‐isothermal crystallization kinetics of PET

Polymer Engineering & Science, 2000
AbstractThe crystallization kinetics of poly(ethylene terephthalate) was studied using constant cooling rate, isothermal and quenching experiments. A non‐isothermal crystallization kinetics equation based on a single mechanism was used to analyze the data.
Piccarolo, S., Brucato, V., Kiflie, Z.
openaire   +2 more sources

Non-isothermal crystallization of fluoropolymers

Journal of Fluorine Chemistry, 1992
Abstract Crystallization kinetics of polymers has received increasing attention since the pioneering work on isothermal crystallization by Avrami in 1939 [M. Avrami, J. Chem. Phys. 7 (1939) 1103.]. More recently the need to understand crystallization phenomena under non-isothermal conditions has forced many researchers to propose modifications of the
M. Fontelos, C. Pizzi, G. Crafa
openaire   +1 more source

Non-isothermal Crystallization of UHMWPE

Journal of Thermal Analysis and Calorimetry, 1999
Processing of Ultra High Molecular Weight Polyethylene (UHMWPE) parts involves non-isothermal cooling leading to crystallinity variations, which cause variations in the mechanical properties. Study of non-isothermal crystallization kinetics of UHMWPE forms the basis for process modelling.
N. C. Parasnis, K. Ramani
openaire   +1 more source

The characteristics of a non-isothermal loop crystallizer

Chemical Engineering Science, 1974
Abstract A model for a recirculating draft-tube crystallizer is presented which accounts for spatial variations in environment. The model consists of a well-stirred section to account for evaporative cooling and two plug flow portions in a recirculating mode.
Steven L. Wiker, Byron E. Anshus
openaire   +1 more source

Non-isothermal cold crystallization of liquid crystalline porphyrins

Soft Matter, 2023
Design, synthesis, and characterization of liquid crystalline porphyrins that exhibit kinetic cold crystallization with multiple overlapping growth and nucleation processes.
Alec L. Dorfner   +12 more
openaire   +2 more sources

Heterogeneous non-isothermal crystallization of polymers

Polymer Science U.S.S.R., 1983
Abstract A study was made of the general formulation of the problem of non-isothermal crystallization of polymers in a heterogeneous temperature field. In the crystallization of bulk polycaprolactum it was found possible to describe this process by an autocatalytic macrokinetic equation previously proposed.
V.P. Begishev   +3 more
openaire   +1 more source

Non-Isothermal Crystallization of Cordierite Glasses

Journal of Thermal Analysis and Calorimetry, 1999
A study is reported of the crystallization behaviour of some glass compositions which belong in the system MgO-Al2O3-SiO2 and which lead to vitreous ceramics with α-cordierite as a main phase. DTA, X-ray diffraction and dilatometric analysis were used to investigate the influence of the type and concentration of the nucleation agents.
C. Oprea, C. Stan, E. Rotiu, C. Popescu
openaire   +1 more source

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