Crystallization, recrystallization, and melting of polymer crystals on heating and cooling examined with fast scanning calorimetry

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Yoshitomo Furushima ◽  
Christoph Schick ◽  
Akihiko Toda
Keyword(s):  
Scanning Calorimetry ◽  
Heating And Cooling ◽  
Fast Scanning Calorimetry ◽  
Polymer Crystals

Heat of fusion of polymer crystals by fast scanning calorimetry

Polymer ◽  
2017 ◽  
Vol 126 ◽  
pp. 240-247 ◽  
Author(s):  
Peggy Cebe ◽  
David Thomas ◽  
John Merfeld ◽  
Benjamin P. Partlow ◽  
David L. Kaplan ◽  
...  
Keyword(s):  
Heat Of Fusion ◽  
Scanning Calorimetry ◽  
Fast Scanning Calorimetry ◽  
Polymer Crystals

scholarly journals Visualization of Polymer Crystallization by In Situ Combination of Atomic Force Microscopy and Fast Scanning Calorimetry

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 890 ◽  
Author(s):  
Rui Zhang ◽  
Evgeny Zhuravlev ◽  
René Androsch ◽  
Christoph Schick
Keyword(s):  
Thermal Treatments ◽  
Polyamide 66 ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Heating And Cooling ◽  
Fast Scanning Calorimetry ◽  
Atomic Force ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone

A chip-based fast scanning calorimeter (FSC) is used as a fast hot-stage in an atomic force microscope (AFM). This way, the morphology of materials with a resolution from micrometers to nanometers after fast thermal treatments becomes accessible. An FSC can treat the sample isothermally or at heating and cooling rates up to 1 MK/s. The short response time of the FSC in the order of milliseconds enables rapid changes from scanning to isothermal modes and vice versa. Additionally, FSC provides crystallization/melting curves of the sample just imaged by AFM. We describe a combined AFM-FSC device, where the AFM sample holder is replaced by the FSC chip-sensor. The sample can be repeatedly annealed at pre-defined temperatures and times and the AFM images can be taken from exactly the same spot of the sample. The AFM-FSC combination is used for the investigation of crystallization of polyamide 66 (PA 66), poly(ether ether ketone) (PEEK), poly(butylene terephthalate) (PBT) and poly(ε-caprolactone) (PCL).

scholarly journals Physical Aging Behavior of a Glassy Polyether

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 954
Author(s):  
Xavier Monnier ◽  
Sara Marina ◽  
Xabier Lopez de Pariza ◽  
Haritz Sardón ◽  
Jaime Martin ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Physical Aging ◽  
Glassy State ◽  
Aging Behavior ◽  
Scanning Calorimetry ◽  
Narrow Temperature Range ◽  
Glass Forming ◽  
Fast Scanning Calorimetry

The present work aims to provide insights on recent findings indicating the presence of multiple equilibration mechanisms in physical aging of glasses. To this aim, we have investigated a glass forming polyether, poly(1-4 cyclohexane di-methanol) (PCDM), by following the evolution of the enthalpic state during physical aging by fast scanning calorimetry (FSC). The main results of our study indicate that physical aging persists at temperatures way below the glass transition temperature and, in a narrow temperature range, is characterized by a two steps evolution of the enthalpic state. Altogether, our results indicate that the simple old-standing view of physical aging as triggered by the α relaxation does not hold true when aging is carried out deep in the glassy state.

Probing Three Distinct Crystal Polymorphs of Melt-Crystallized Polyamide 6 by an Integrated Fast Scanning Calorimetry Chip System

2021 ◽  
Author(s):  
Xiaoshi Zhang ◽  
Anne Gohn ◽  
Gamini Mendis ◽  
John F. Buzinkai ◽  
Steven J. Weigand ◽  
...  
Keyword(s):  
Polyamide 6 ◽  
Scanning Calorimetry ◽  
Fast Scanning Calorimetry

scholarly journals pH-controlled synthesis of sustainable lauric acid/SiO2 phase change material for scalable thermal energy storage

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shafiq Ishak ◽  
Soumen Mandal ◽  
Han-Seung Lee ◽  
Jitendra Kumar Singh
Keyword(s):  
Electron Microscopy ◽  
Phase Change ◽  
Lauric Acid ◽  
Photoelectron Spectroscopy ◽  
Phase Change Materials ◽  
Precursor Solution ◽  
Thermal Reliability ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Heating And Cooling

AbstractLauric acid (LA) has been recommended as economic, eco-friendly, and commercially viable materials to be used as phase change materials (PCMs). Nevertheless, there is lack of optimized parameters to produce microencapsulated PCMs with good performance. In this study, different amounts of LA have been chosen as core materials while tetraethyl orthosilicate (TEOS) as the precursor solution to form silicon dioxide (SiO2) shell. The pH of precursor solution was kept at 2.5 for all composition of microencapsulated LA. The synthesized microencapsulated LA/SiO2 has been characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-Ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM). The SEM and TEM confirm the microencapsulation of LA with SiO2. Thermogravimetric analysis (TGA) revealed better thermal stability of microencapsulated LA/SiO2 compared to pure LA. PCM with 50% LA i.e. LAPC-6 exhibited the highest encapsulation efficiency (96.50%) and encapsulation ratio (96.15%) through Differential scanning calorimetry (DSC) as well as good thermal reliability even after 30th cycle of heating and cooling process.

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