Isothermal and non-isothermal crystallisation kinetics of pCBT and PBT

2008 ◽  
Vol 95 (1) ◽  
pp. 221-227 ◽  
Author(s):  
B. Lehmann ◽  
J. Karger-Kocsis
Keyword(s):  
Crystallisation Kinetics ◽  
Isothermal Crystallisation ◽  
Kinetics Of

scholarly journals Physical Properties and Non-Isothermal Crystallisation Kinetics of Primary Mechanically Recycled Poly(l-lactic acid) and Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3396
Author(s):  
Luboš Běhálek ◽  
Jan Novák ◽  
Pavel Brdlík ◽  
Martin Borůvka ◽  
Jiří Habr ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Physical Properties ◽  
Structural Changes ◽  
The Other ◽  
Half Time ◽  
Crystallisation Kinetics ◽  
Isothermal Crystallisation ◽  
Melt Crystallisation ◽  
Kinetics Of ◽  
Crystallisation Rate

The physical properties and non-isothermal melt- and cold-crystallisation kinetics of poly (l-lactic acid) (PLLA) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) biobased polymers reprocessed by mechanical milling of moulded specimens and followed injection moulding with up to seven recycling cycles are investigated. Non-isothermal crystallisation kinetics are evaluated by the half-time of crystallisation and a procedure based on the mathematical treatment of DSC cumulative crystallisation curves at their inflection point (Kratochvil-Kelnar method). Thermomechanical recycling of PLLA raised structural changes that resulted in an increase in melt flow properties by up to six times, a decrease in the thermal stability by up to 80 °C, a reduction in the melt half-time crystallisation by up to about 40%, an increase in the melt crystallisation start temperature, and an increase in the maximum melt crystallisation rate (up to 2.7 times). Furthermore, reprocessing after the first recycling cycle caused the elimination of cold crystallisation when cooling at a slow rate. These structural changes also lowered the cold crystallisation temperature without impacting the maximum cold crystallisation rate. The structural changes of reprocessed PHBV had no significant effect on the non-isothermal crystallisation kinetics of this material. Additionally, the thermomechanical behaviour of reprocessed PHBV indicates that the technological waste of this biopolymer is suitable for recycling as a reusable additive to the virgin polymer matrix. In the case of reprocessed PLLA, on the other hand, a significant decrease in tensile and flexural strength (by 22% and 46%, respectively) was detected, which reflected changes within the biobased polymer structure. Apart from the elastic modulus, all the other thermomechanical properties of PLLA dropped down with an increasing level of recycling.

Studies of isothermal crystallisation kinetics of sunflower hard stearin-based confectionery fats

2013 ◽  
Vol 139 (1-4) ◽  
pp. 184-195 ◽  
Author(s):  
Miguel A. Bootello ◽  
Richard W. Hartel ◽  
Madeline Levin ◽  
Jose M. Martínez-Blanes ◽  
Concepción Real ◽  
...  
Keyword(s):  
Crystallisation Kinetics ◽  
Confectionery Fats ◽  
Isothermal Crystallisation ◽  
Kinetics Of

Non-Isothermal Crystallisation Kinetics of Polyamide 6/Mesoporous Silica Nanocomposites

2007 ◽  
Vol 15 (7) ◽  
pp. 561-567
Author(s):  
Qingyuan Hu ◽  
Xiangling Ji ◽  
Yunfeng Lu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Mesoporous Silica ◽  
Polyamide 6 ◽  
Nucleating Agents ◽  
Scanning Calorimetry ◽  
Crystallisation Kinetics ◽  
Silica Nanocomposites ◽  
Crystallisation Process ◽  
Isothermal Crystallisation ◽  
Kinetics Of

Non-isothermal crystallisation kinetics of a polyamide 6/mesoporous silica nanocomposite (PA6-MS) has been investigated by differential scanning calorimetry (DSC) at different cooling rates. Mandelkern, Jeziorny-Ziabicki and Ozawa methods were applied to describe this crystallisation process. The analyses show that the mesoporous silica particles act as nucleating agents in the composite and that the Avrami exponent n varies from 3.0 to 4.6. The addition of mesoporous silica influenced the mechanism of nucleation and the growth of polyamide 6 (PA 6) crystallites.

Non-Isothermal Crystallisation Kinetics of In Situ Prepared Poly(ɛ-caprolactone)/Surface-Treated SiO2 Nanocomposites

2007 ◽  
Vol 208 (4) ◽  
pp. 364-376 ◽  
Author(s):  
Alexandros A. Vassiliou ◽  
George Z. Papageorgiou ◽  
Dimitrios S. Achilias ◽  
Dimitrios N. Bikiaris
Keyword(s):  
Crystallisation Kinetics ◽  
Sio2 Nanocomposites ◽  
Isothermal Crystallisation ◽  
Kinetics Of

scholarly journals Correction: Ahmad, I.A., et al. Non-Isothermal Crystallisation Kinetics of Carbon Black-Graphene-Based Multimodal-Polyethylene Nanocomposites. Nanomaterials, 2019, 9, 100

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 392 ◽  
Author(s):  
Ibrahim Ahmad ◽  
Hyun-Kyung Kim ◽  
Suleyman Deveci ◽  
R. Kumar
Keyword(s):  
Carbon Black ◽  
Crystallisation Kinetics ◽  
Isothermal Crystallisation ◽  
Kinetics Of ◽  
Published Paper

In the published paper [1], there was a typo error mistake in Equation (5), which was supposed to be expressed as “ log Z t + n log t = log K T − m log Φ ” instead of “log Zt + n log t = log KT − ml” [...]

Isothermal crystallisation kinetics of liquid crystal semiflexible polyesters

1990 ◽  
Vol 162 (1) ◽  
pp. 179-188 ◽  
Author(s):  
M. Laus ◽  
P. Ferruti ◽  
D. Caretti ◽  
A.S. Angeloni ◽  
G. Galli ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Crystallisation Kinetics ◽  
Isothermal Crystallisation ◽  
Kinetics Of
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