Article
Chemistry, Physical
Kanjana Sirirak, Visit Vao-soongnern
Summary: The stiffness of polymer chains is closely related to the macroscopic properties of polymeric materials. This study aims to investigate the role of chain stiffness in controlling polymer crystallization. Molecular simulations show that the rate of structural formation and the degree of crystallinity are influenced by the chain stiffness parameter.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Polymer Science
Katalee Jariyavidyanont, Andreas Janke, Muhammad Tariq, Maria Laura Di Lorenzo, Christoph Schick, Rene Androsch
Summary: By conducting self-seed crystallization experiments, this study quantified the different thermal stabilities of pointlike and shishlike crystallization precursors of polyamide 11, coexisting in the same sample. Despite their similar thermal stabilities, these precursors exhibit distinctly different nucleation efficacies, with shishlike precursors leading to faster crystallization due to various factors such as their larger size and more perfect chain conformation.
Article
Polymer Science
Nicholas F. Mendez, Deboleena Dhara, Qingteng Zhang, Suresh Narayanan, Linda S. Schadler, Alejandro J. J. Muller, Sanat K. Kumar
Summary: X-ray photon correlation spectroscopy measurements were used to analyze the dynamics of bare and bimodal grafted silica nanoparticles mixed with PEO melts. The results showed diffusive behavior of the nanoparticles in dilute polymer nanocomposite samples, taking into account the adsorbed PEO polymer layer. The dynamics of grafted nanoparticles were found to be influenced by morphology and grafting parameters at larger scales.
Article
Mathematics
Daniele Ettore Otera
Summary: In this note, we discuss the relationships between the growth rates of various functions that describe the topological properties of discrete groups at infinity. Specifically, we focus on the rate at which the simple connectivity at infinity vanishes for certain geometric classes of finitely presented groups.
Article
Materials Science, Multidisciplinary
Qiu Zhong, Huidong Li, Ye Tao, Chengcheng Cao, Liping Yang
Summary: A novel focused nanosecond pulsed laser-induced nucleation approach is demonstrated for oxide ceramic melts at undercooled state. Nucleation and growth are observed from the surface of undercooled alumina and neodymium yttrium aluminum garnet melts. The proposed method provides a different perspective for the classical nucleation theory of homogeneous nucleation.
ADVANCED ENGINEERING MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Wolfgang Wisniewski, Christian Russel
Summary: Crystal engineering is a broad field that aims to produce a variety of crystalline phases for specific applications. The electrochemically induced nucleation method allows for the production of oxidic crystalline phases with orientation alignment in a short period of time. This method prevents nucleation outside of the melt while enabling high-quality crystal growth, making it especially effective for producing difficult-to-obtain crystal phases.
Article
Chemistry, Physical
Jun Yang, Zongfa Liu, Zhiping Zhou, Yongqiang Ming, Sumin Li, Tongfan Hao, Yijing Nie
Summary: This study used molecular dynamics simulations to investigate the influence of carbon nanotube (CNT) content on the crystallization behavior of CNT-filled polyethylene systems under stretching. The results showed that higher CNT content led to greater orientation and more trans-conformation during stretching, resulting in the formation of more precursors. However, when the CNT content exceeded a certain threshold, the formation of a filler network restricted chain movements and decreased the overall crystallization rate.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Alexander Ya Malkin, Igor' Gumennyi, Ali D. Aliev, Anatoly E. Chalykh, Valery G. Kulichikhin
Summary: The study analyzed the evolution of the morphology of two incompatible polymer melts in a capillary flow using analytical electron microscopy. The spatial distribution and orientation of the polymers were found to be minimally affected by the specified shear rate, with a thin boundary layer formed by the low-viscosity LC polymer being the only significant change observed.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Physics, Multidisciplinary
F. P. Hessberger, M. Block, Ch E. Duellmann, A. Yakushev, M. Leino, J. Uusitalo
Summary: Two recent papers reported the discovery of the new isotope Md-244, but the decay data presented in Pore et al. and Khuyagbaatar et al. are conflicting. Pore et al. report two isomeric states decaying by alpha emission, while Khuyagbaatar et al. report only a single transition. By comparing the data from different studies, it is concluded that the data presented in Pore et al. should be attributed to Md-245.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Muhammad Anwar, Richard S. Graham
Summary: Modelling of flow-induced nucleation in polymers suggests that long chains are enriched in nuclei, affecting the nucleation rate and mechanism, which is crucial for predicting the rate accurately. Through molecular dynamics simulations, it was found that long chains are significantly enriched in nuclei, supporting quantitative predictions from the recent polySTRAND model.
Review
Polymer Science
Daniele Parisi, Jiho Seo, Richard P. Schaake, Alicyn M. Rhoades, Ralph H. Colby
Summary: This study focuses on the shear-induced isotropic-nematic transition exhibited by PEEK melts, revealing a relationship between zero-shear viscosity and molecular weight. The shear-induced I-N transition is characterized by three distinct regimes in the flow curves, providing insights into this intriguing phenomenon.
PROGRESS IN POLYMER SCIENCE
(2021)
Article
Engineering, Mechanical
Zebei Mao, Tong Li, Haifei Zhan, Bo Wang
Summary: This study assessed the influences of pressure and temperature on the mechanical properties of semi-crystalline 1-4 polyphenylene sulfide (PPS) using experimental characterization and molecular modeling techniques. The results showed that shear deformation in the flow field is a key factor in the transformation from amorphous polymers to precursors. Pressure can accelerate the transition of precursors to crystals, but the proportion of precursors in PPS is not observed under higher pressure. The findings of this study can be helpful in identifying optimal processing parameters for manufacturing PPS for specific applications.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mathematics, Applied
Feifei Du, Jun-Guo Lu
Summary: In this paper, a generalized Volterra-type integral inequality is developed and the effect of the fractional-order omega on the application of the integer-order Gronwall integral inequality (IOGII) is discussed.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Physics, Nuclear
Qin-Fang Cao, Hao Chen, Hong-Rong Qi, Han-Qing Zheng
Summary: The analysis of LHCb data on X(6900) in the di-J/psi system suggests that both confining and molecular states are possible. However, the exact nature of X(6900) remains unclear with current statistics, though it is likely to have the same quantum numbers as the lowest state in the di-J/psi system and is probably not interpreted as a J/psi - psi(2S) molecular state.
Article
Mathematics, Applied
Tuomas P. Hytonen
Summary: In this paper, an abstract framework for convex body domination is presented and applied to Banach space-valued functions. The study of generalized commutators yields new examples of bounded operators.
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2024)