Article
Polymer Science
Akihiko Toda
Summary: The crystallization kinetics of poly(butylene terephthalate) under high supercooling was investigated using Temperature-Modulated Fast Scanning Calorimetry (TM-FSC). The study found a temperature dependence of crystal growth rate and compared it with the peak time of heat flow during isothermal crystallization. The crystal growth rate was found to be practically determined by a mobility factor near the glass transition.
Article
Thermodynamics
S. P. Magalhaes da Silva, Monica A. Silva, Jose M. Oliveira
Summary: This study investigated the non-isothermal cold crystallization behaviors of cork-polymer composites based on polylactic acid matrix. The results showed that cork powder residues act as a nucleating agent, accelerating the crystallization rate and reducing the half-time crystallization values. Additionally, the addition of cork was found to decrease the cold crystallization temperature of the PLA matrix.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Polymer Science
Shouang Wu, Bocheng Wang, Xiaoling Xu, Chonggang Wu, Tao Hu, Xuan Zheng, Xinghou Gong
Summary: The addition of S-MA compatibilizer had a positive impact on the dispersion and crystallization behavior of SBS in PLA blends. The study found that SBS exhibited both plasticization and dilution effects under different conditions, with the effects being enhanced with increasing S-MA content.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Thermodynamics
Jen Kovinich, Simon A. M. Hesp, Haibo Ding
Summary: This study utilized MDSC analysis to investigate the impact of adding n-alkanes to asphalt binders, finding that it alters the thermal behavior of the asphalt, with varying effects depending on the type of n-alkane used. As the wax oxidizes, the heat flow peaks in the asphalt decrease, and the crystallizable fractions can be modeled using different theoretical frameworks.
THERMOCHIMICA ACTA
(2021)
Article
Construction & Building Technology
Haibo Ding, Simon A. M. Hesp
Summary: Thermoreversible aging of asphalt is an important attribute that affects durability of flexible pavements. The aging process strongly depends on composition and particularly wax content. Binders produced from oil sands-derived crude oil with low wax contents benefit overall life cycle costs and improve the sustainability of the road building industry.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Ceramics
Abhiram Senapati, Suvendu Kumar Barik, Pradyumna Kumar Parida, Hrudananda Jena
Summary: Sodium niobium phosphate (SNP) glasses with different compositions were prepared and their non-isothermal kinetics of glass transition and crystallization were studied. The activation energy of glass transition was deduced from the dependence of glass transition temperature on the heating rate. The average activation energies of crystallization were calculated by different kinetic methods. The nucleation and growth of various crystalline phases formed on heat treatment were investigated through Avrami exponents and SEM analysis.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Engineering, Environmental
Pedro H. M. Nicacio, Amanda M. C. Severo, Ana B. S. Barros, Ananda K. C. Albuquerque, Renate M. R. Wellen, Katharina Koschek
Summary: This study investigates the influence of aging on the phase transitions of PLA compounds. The results show an increase in crystalline ordering after aging, and the kinetics of cold crystallization and recrystallization are elucidated using modulated differential scanning calorimetry (MDSC). Pseudo-Avrami model is found to fit the experimental data well. The findings provide important insights into the reordering and recrystallization phenomena of composite materials.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
Article
Materials Science, Ceramics
Semen E. Lapuk, Marat A. Ziganshin, Radik A. Larionov, Timur A. Mukhametzyanov, Christoph Schick, Alexander V. Gerasimov
Summary: Robust determination of parameters governing the stability of amorphous drugs is crucial in modern pharmaceutics. The kinetic stability of these systems greatly impacts their practical applications. This study determined the critical cooling rates and kinetic parameters of cold crystallization for four slowly crystallizing sulfonamides. The Nakamura crystallization model demonstrated good prognostic ability by determining the stability time profile of drug systems prone to crystallization from non-isothermal thermokinetic data.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Polymer Science
Janetty Jany Pereira Barros, Carlos Pereira Soares, Esperidiana Augusta Barretos de Moura, Renate Maria Ramos Wellen
Summary: This study investigates the effect of gamma radiation on the interaction between kraft lignin and PBAT/PLA blend. The results show that irradiation promotes the miscibility and compatibility of PBAT/PLA/lignin. The crystallization peak of PBAT/PLA/lignin shifts to lower temperatures and the crystallization rate decreases after irradiation.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Fotis Christakopoulos, Enrico M. Troisi, Alla S. Sologubenko, Nic Friederichs, Laura Stricker, Theo A. Tervoort
Summary: This study investigated the melting behavior of nascent UHMWPE reactor powder through differential scanning calorimetry and evaluated the apparent activation energy barrier of melting for different UHMWPE grades with isoconversional analysis. The results showed that the apparent activation energy of melting can be used as a screening method to estimate the maximum draw ratio, highlighting the correlation between melting kinetics, microstructure, and maximum draw ratio for all grades.
Article
Polymer Science
Yucheng He, Dan Liu, Jiping Wang, Pengju Pan, Wenbing Hu
Summary: This study investigates the crystallization kinetics and crystal polymorphism of PLA blends with different molecular weights using Flash DSC measurement and confocal Raman spectroscopy. The results show that high molecular weights affect the crystal morphology and suppress the nucleation rates of stereocomplex crystals, resulting in the dominance of homocrystals.
Article
Materials Science, Composites
Jose Antonio Gonzalez Ruiz, Jordi Farjas, Norbert Blanco, Josep Costa, Marc Gascons
Summary: This study demonstrates the feasibility of predicting the cure evolution of composite resin under arbitrary and complex temperature programs using two unexplored methods. These reliable predictions have the potential to optimize curing times and increase productivity in industrial processes.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Thermodynamics
Radhika Wazalwar, Ashok M. Raichur
Summary: The addition of graphene oxide (GO) and p-Phenylenediamine functionalized graphene oxide (fGO) to tetra-functional epoxy resulted in lower activation energy for curing behavior, indicating a more efficient curing process compared to neat epoxy. This was attributed to the amine groups on the surface of the filler, acting as a secondary hardener that triggered the epoxy ring opening reaction.
THERMOCHIMICA ACTA
(2021)
Article
Polymer Science
Alireza Bahramian
Summary: In this study, the environmental sustainability, mechanical durability, and thermal stability of PET-based nanocomposite films were evaluated compared to pure PET. The addition of different nanoparticles had significant effects on the properties of the samples, with the interaction of SiO2NPs with PET chains showing the most promising improvement in sample performance.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Saeed Dolatshah, Shervin Ahmadi, Amir Ershad-Langroudi, Hedieh Jashni
Summary: This study investigated the synergistic effect of different chain extenders and catalysts on the rheological behavior of PET, finding that a combination of PMDA and PENTA at 1.5% and 0.5% respectively resulted in the best rheological properties for modified PET. Additionally, DBTDL acted as an accelerator for chain extension reaction, improving the rheological properties of PET by increasing the chain extending rate. Thermal properties of modified PET were also studied using differential scanning calorimetry.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)