Results 241 to 250 of about 26,195 (294)

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 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, Diana P. Locoteta, Caleb D. Messinger, Michael R. Ramsey, Nathaniel Y. Kim, Elene Sadzaglishvili, Joshua C. Kranick, Joseph S. Kuehner, Collin J. Timony, Michelle Langton, Jeffrey E. Winklarek, Lucas J. Tucker, Jodi L. O’Donnell   +12 more
openaire   +2 more sources

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

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, I.A. Kipin, Z.S. Andrianova, A.Ya. Malkin   +3 more
openaire   +1 more source

A model for non-isothermal crystallization kinetics

Journal of Non-Crystalline Solids, 1996
Abstract In the framework of a previously proposed Integral Equation formalism, an equation is derived for the kinetics of non-isothermal crystallization (devitrification). It is shown that the Kissinger multiple-scan thermal analysis technique, commonly used for the evaluation of activation energies, cannot be applied to all non-isothermal ...
V. Erukhimovitch, J. Baram
openaire   +1 more source

Kinetics of non-isothermal crystallization

Polymer, 1971
Abstract Non-isothermal kinetics of the process of nucleation and its growth are derived by extending Avrami's equation. Kinetic analysis of the thermoanalytical data of the process is also described and applied to DSC curves of crystallization obtained by cooling poly(ethylene terephthalate) at constant rates.
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

Isothermal and non‐isothermal crystallization behavior of PET nanocomposites

Polymer Engineering & Science, 2011
AbstractPolyethylene terephthalate (PET)/clay nanocomposites (PCNs) containing 1 wt% Cloisite 30B (C30B) were prepared via melt compounding. Modulated differential scanning calorimetry (MDSC) for isothermally crystallized samples revealed that the third endotherm at the highest temperature may be attributed to the recrystalization and melting of ...
Hesam Ghasemi, Pierre J. Carreau, Musa R. Kamal   +2 more
openaire   +2 more sources

Surface and bulk crystallization in non-isothermal devitrification of glasses

Thermochimica Acta, 1980
Abstract The surface and bulk crystallization of Li2O · 2 SiO2 glass has been studied by differential thermal analysis and the influence of the specific surface area of the sample and the nucleation heat treatment on the crystallization kinetics is pointed out.
A. Marotta, A. Buri, BRANDA, FRANCESCO
openaire   +2 more sources