Isothermal melt crystallization kinetics, melting behavior, and spherulitic morphology of novel biobased poly(hexylene oxalate)

RSC Advances ◽  
2015 ◽  
Vol 5 (126) ◽  
pp. 104250-104257 ◽  
Author(s):  
Rui Yan ◽  
Zhaobin Qiu
Keyword(s):  
Crystallization Kinetics ◽  
Crystallization Temperature ◽  
Melting Behavior ◽  
Melt Crystallization ◽  
Temperature Range ◽  
Spherulitic Morphology ◽  
Banded Spherulites

Banded spherulites were observed for novel biobased poly(hexylene oxalate) in a wide crystallization temperature range.

scholarly journals Isothermal Crystallization Kinetics of Poly(4-hydroxybutyrate) Biopolymer

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2488 ◽  
Author(s):  
Ina Keridou ◽  
Luis J. del Valle ◽  
Lutz Funk ◽  
Pau Turon ◽  
Ibraheem Yousef ◽  
...  
Keyword(s):  
Crystallization Kinetics ◽  
Crystallization Temperature ◽  
Isothermal Crystallization ◽  
Crystallization Rate ◽  
Melting Behavior ◽  
Scattering Data ◽  
Dsc Measurements ◽  
Pom Analyses ◽  
Banded Spherulites ◽  
Kinetics Of

Thermal properties and crystallization kinetics of poly(4-hydroxybutyrate) (P4HB) have been studied. The polymer shows the typical complex melting behavior associated to different lamellar populations. Annealing processes had great repercussions on properties and the morphology of constitutive lamellae as verified by X-ray scattering data. Kinetics of isothermal crystallization was evaluated by both polarizing optical microscopy (POM) and calorimetric (DSC) measurements, which indicated a single crystallization regime. P4HB rendered banded spherulites with a negative birefringence when crystallized from the melt. Infrared microspectroscopy was applied to determine differences on the molecular orientation inside a specific ring according to the spherulite sectorization or between different rings along a determined spherulitic radius. Primary nucleation was increased during crystallization and when temperature decreased. Similar crystallization parameters were deduced from DSC and POM analyses (e.g., secondary nucleation parameters of 1.69 × 105 K2 and 1.58 × 105 K2, respectively). The effect of a sporadic nucleation was therefore minimized in the experimental crystallization temperature range and a good proportionality between overall crystallization rate (k) and crystal growth rate (G) was inferred. Similar bell-shaped curves were postulated to express the temperature dependence of both k and G rates, corresponding to the maximum of these curves close to a crystallization temperature of 14–15 °C.

scholarly journals Correction: DBU-catalyzed biobased poly(ethylene 2,5-furandicarboxylate) polyester with rapid melt crystallization: synthesis, crystallization kinetics and melting behavior

RSC Advances ◽  
2017 ◽  
Vol 7 (23) ◽  
pp. 13877-13877
Author(s):  
Jiaping Wu ◽  
Hongzhou Xie ◽  
Linbo Wu ◽  
Bo-Geng Li ◽  
Philippe Dubois
Keyword(s):  
Crystallization Kinetics ◽  
Melting Behavior ◽  
Melt Crystallization ◽  
Poly Ethylene

Correction for ‘DBU-catalyzed biobased poly(ethylene 2,5-furandicarboxylate) polyester with rapid melt crystallization: synthesis, crystallization kinetics and melting behavior’ by Jiaping Wu et al., RSC Adv., 2016, 6, 101578–101586.

scholarly journals Study on the Performances of PLLA/CaSiO3 Composites

2021 ◽  
Vol 236 ◽  
pp. 02037
Author(s):  
Qiuhe Zhang ◽  
Lisha Zhao ◽  
Ting Deng ◽  
Yanhua Cai
Keyword(s):  
Thermal Decomposition ◽  
Crystallization Temperature ◽  
Melting Process ◽  
Melting Behavior ◽  
Decomposition Temperature ◽  
Melt Crystallization ◽  
Heating Rates ◽  
Promoting Effect ◽  
Decomposition Behavior ◽  
Relationship Of

In the current work, calcium silicate (CaSiO3) was blended with the poly (L-lactic acid) (PLLA) to prepare the PLLA/CaSiO3 composites, and the crystallization process, melting process and thermal decomposition behavior of PLLA/CaSiO3 composites were studied. The promoting effect of CaSiO3 on the crystallization of PLLA was proved by the melt-crystallization, and the CaSiO3 content was a crucial factor to the crystallization behavior of PLLA. The crystallization temperature significantly affected the melting behavior of PLLA, and the double melting peaks degenerated into the single melting peak with the increasing of crystallization temperature from 90 °C to 130 °C. Additionally, for a given PLLA/CaSiO3 sample, the different melting processes in heating after the melt-crystallization results from the different heating rates, and the appearance of the cold-crystallization peak indicated the medium nucleation capacity of CaSiO3. The presence of CaSiO3 decreased the onset thermal decomposition temperature of PLLA, and this effect depended on the competitive relationship of the poor compatibility of PLLA with CaSiO3 and the content of CaSiO3 with high thermal stability.

DBU-catalyzed biobased poly(ethylene 2,5-furandicarboxylate) polyester with rapid melt crystallization: synthesis, crystallization kinetics and melting behavior

RSC Advances ◽  
2016 ◽  
Vol 6 (103) ◽  
pp. 101578-101586 ◽  
Author(s):  
Jiaping Wu ◽  
Hongzhou Xie ◽  
Linbo Wu ◽  
Bo-Geng Li ◽  
Philippe Dubois
Keyword(s):  
Crystallization Kinetics ◽  
Melting Behavior ◽  
Melt Crystallization ◽  
Isothermal Conditions ◽  
Metallic Catalyst ◽  
Poly Ethylene

PEF synthesized by non-metallic catalyst (DBU) exhibited rapid melt crystallization in both non-isothermal and isothermal conditions.

The reaction of amorphous Ni-Nb films with Si in the presence of a native SiO2 layer

1990 ◽  
Vol 48 (4) ◽  
pp. 664-665
Author(s):  
N. Rozhanski ◽  
A. Barg
Keyword(s):  
High Temperature ◽  
Crystallization Temperature ◽  
Diffusion Barriers ◽  
Sio2 Layer ◽  
Si Substrate ◽  
Cross Sectional ◽  
Plan View ◽  
Temperature Range ◽  
Sputter Deposited

Amorphous Ni-Nb alloys are of potential interest as diffusion barriers for high temperature metallization for VLSI. In the present work amorphous Ni-Nb films were sputter deposited on Si(100) and their interaction with a substrate was studied in the temperature range (200-700)°C. The crystallization of films was observed on the plan-view specimens heated in-situ in Philips-400ST microscope. Cross-sectional objects were prepared to study the structure of interfaces.The crystallization temperature of Ni5 0 Ni5 0 and Ni8 0 Nb2 0 films was found to be equal to 675°C and 525°C correspondingly. The crystallization of Ni5 0 Ni5 0 films is followed by the formation of Ni6Nb7 and Ni3Nb nucleus. Ni8 0Nb2 0 films crystallise with the formation of Ni and Ni3Nb crystals. No interaction of both films with Si substrate was observed on plan-view specimens up to 700°C, that is due to the barrier action of the native SiO2 layer.

The effect of cooling rate on crystallization behavior and tensile properties of CF/PEEK composites

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Guangming Dai ◽  
Lihua Zhan ◽  
Chenglong Guan ◽  
Minghui Huang
Keyword(s):  
Cooling Rate ◽  
Crystallization Temperature ◽  
Crystallization Behavior ◽  
Crystalline Polymer ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Cooling Rates ◽  
Control Range ◽  
Temperature Range ◽  
Transverse Tensile

Abstract In this study, the differential scanning calorimetry (DSC) tests were performed to measure the nonisothermal crystallization behavior of carbon fiber reinforced polyether ether ketone (CF/PEEK) composites under different cooling rates. The characteristic parameters of crystallization were obtained, and the nonisothermal crystallization model was established. The crystallization temperature range of the material at different cooling rates was predicted by the model. The unidirectional laminates were fabricated at different cooling rates in the crystallization temperature range. The results showed that the crystallization temperature range shifted to a lower temperature with the increase of cooling rate, the established nonisothermal crystallization model was consistent with the DSC test results. It is feasible to shorten the cooling control range from the whole process to the crystallization range. The crystallinity and transverse tensile strength declined significantly with the increase of the cooling rate in the crystallization temperature range. The research results provided theoretical support for the selection of cooling conditions and temperature control range, which could be applied to the thermoforming process of semi-crystalline polymer matrixed composites to improve the manufacturing efficiency.

Poly(dithiotriethylene adipate): Melting behavior, crystallization kinetics and morphology

2005 ◽  
Vol 41 (8) ◽  
pp. 1909-1918 ◽  
Author(s):  
L. Finelli ◽  
V. Siracusa ◽  
N. Lotti ◽  
P. Marchese ◽  
A. Munari
Keyword(s):  
Crystallization Kinetics ◽  
Melting Behavior

scholarly journals The Effect of WS2 Nanosheets on the Non-Isothermal Cold- and Melt-Crystallization Kinetics of Poly(l-lactic acid) Nanocomposites

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2214
Author(s):  
Mohammed Naffakh ◽  
Pablo Rica ◽  
Carmen Moya-Lopez ◽  
José Antonio Castro-Osma ◽  
Carlos Alonso-Moreno ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Transition Metal Dichalcogenides ◽  
Crystallization Rate ◽  
Melting Behavior ◽  
Hybrid Nanocomposites ◽  
Melt Crystallization ◽  
Heating Rates ◽  
Solution Blending ◽  
New Perspective ◽  
Ws2 Nanosheets

In the present work, hybrid nanocomposite materials were obtained by a solution blending of poly(l-lactic acid) (PLLA) and layered transition-metal dichalcogenides (TMDCs) based on tungsten disulfide nanosheets (2D-WS2) as a filler, varying its content between 0 and 1 wt%. The non-isothermal cold- and melt-crystallization and melting behavior of PLLA/2D-WS2 were investigated. The overall crystallization rate, final crystallinity, and subsequent melting behavior of PLLA were controlled by both the incorporation of 2D-WS2 and variation of the cooling/heating rates. In particular, the analysis of the cold-crystallization behavior of the PLLA matrix showed that the crystallization rate of PLLA was reduced after nanosheet incorporation. Unexpectedly for polymer nanocomposites, a drastic change from retardation to promotion of crystallization was observed with increasing the nanosheet content, while the melt-crystallization mechanism of PLLA remained unchanged. On the other hand, the double-melting peaks, mainly derived from melting–recrystallization–melting processes upon heating, and their dynamic behavior were coherent with the effect of 2D-WS2 involved in the crystallization of PLLA. Therefore, the results of the present study offer a new perspective for the potential of PLLA/hybrid nanocomposites in targeted applications.

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