Non-Isothermal Crystallization Behaviour and Kinetics of LLDPE/REDMUD Blends

Abstract

The non-isothermal crystallization behaviour of pure LLDPE and LLDPE/REDMUD blends was investigated by differential scanning calorimetry (DSC), and the crystallization kinetics was analyzed by three methods, namely the Jeziorny, the Mo and the Ozawa. The results show that an optimal content of REDMUD (lower than10 wt.%) can enhance the kinetic crystallizability of the system because of heterogeneous nucleation, but excessive REDMUD, by physical hindrance, would impair the kinetic crystallizability. In non-isothermal crystallization kinetics, the Ozawa model did not fit well with the crystallization behaviour of these systems, while the Jeziorny and Mo models were found to be applicable. Furthermore, the activation energy ΔE calculated by the Kissinger method for the transport of macromolecular segments to the growing surface of crystal nucleus indicates that REDMUD could significantly reduce the crystallization migration activation energy of these blends.

Application of the NPK Method in the Crystallization Kinetics of High-Density Polyethylene

“…According with He et al [19], Figure 1 shows that the temperature of the crystallization peak decreases with increasing cooling rate, while the crystallization temperature range widens with increasing cooling rate.…”

Study of Nonisothermal Crystallization Kinetics of Unstretched and Uniaxially Stretched Electroactive PVDF Composite Films

“…where, dH/dT denotes the heat flow rate at a temperature T; T o and T ∞ are the onset and end crystallization temperature; T is the crystallization temperature at a given crystallization time "t"; A T is the area under the curve between onset crystallization temperature and a given temperature and A is the total area under the curve between the onset and end crystallization temperature. For, nonisothermal crystallization process, the crystallization time (t) can be calculated from the corresponding crystallization temperature and rate of cooling (ø) as given by the below formula [23] ;…”

“…For, nonisothermal crystallization process, the crystallization time ( t ) can be calculated from the corresponding crystallization temperature and rate of cooling ( ø ) as given by the below formula [ 23 ] ; $$$$\begin{equation*} t = \frac{{{T^{\rm{O}}} - T}}{\emptyset } \end{equation*}$$$$…”

“…Due to spherulitic impingement during the latter growth stages of crystallization, the plots in the upper part of the graph are curved. [ 23 ] When the temperature axis changed into timescale, the retarding effect of cooling rate can be observed as shown in Figure 4.…”

Effect of Cyclo-Olefin Copolymer Loading on Kinetics, Thermodynamics and Model of Linear Low Density Polyethylene Crystallinity

“…They found that the lowest crystallinity was shown in 10% rubber/ mLLDPE mixture. Non-isothermal crystallization behaviour and the crystallization kinetics of pure LLDPE and LLDPE/REDMUD blends were investigated by DSC [26].…”