Aims: A simple and easy optical method is proposed for the determination of glass transition temperature (Tg) of polymers.
Methods & Results: Tg was determined using the technique of microsphere imaging to monitor the variation of the refractive index of polymer microsphere as a function of temperature. It was demonstrated that the method can eliminate most thermal lag and has sensitivity about six fold higher than the conventional method in Tg determination. So the determined Tg is more accurate and varies less with cooling/heating rate than that obtained by conventional methods. The most attractive character of the method is that it can simultaneously determine the Tg of several polymers in a single experiment, so it can greatly save experimental time and heating energy.
Conclusion: The method is not only applicable for polymer microspheres, but also for the materials with arbitrary shapes. Therefore, it is expected to be broadly applied to different fundamental researches and practical applications of polymers.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4795599 | PMC |
| http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0151454 | PLOS |
Publication Analysis
Top Keywords
Similar Publications
The insecticide susceptibility of Waterhouse (Hemiptera: Miridae) is being evaluated using shoot and glass-vial assay as described by IRAC. However, the reliability of the assay depends on feeding preference and contact toxicity. Hence, the cocoa pod was used as a substrate to test the susceptibility of in comparison with existing methods.
View Article and Find Full Text PDFALS Motor Observational Telemedicine Objective Rasch-Built Assessment: A Quantitative Scale for the Era of Teleneurology.
Neurol Clin Pract
April 2025
Department of Neurology, Emory University School of Medicine, Atlanta, GA.
Background And Objectives: Telemedicine has become a mainstay of ALS clinical care, but there is currently no standardized approach for assessing and tracking changes to the neurologic examination in this format. The goal of this study was to create a standardized telemedicine-based motor examination scale to objectively and reliably track ALS progression and use Rasch methodology to validate the scale and improve its psychometric properties.
Methods: A draft telemedicine examination scale with 25 items assessing movement in the bulbar muscles, neck, trunk, and extremities was created by an ALS expert panel, incorporating input from patient advisors.
Clinical Outcomes after Revascularization in Patients with Chronic Limb-Threatening Ischemia.
Ann Vasc Dis
January 2025
Department of Vascular Surgery, Aichi Medical University, Nagakute, Aichi, Japan.
Chronic limb-threatening ischemia (CLTI) occurs in the advanced stage of peripheral artery disease and is associated with high risks of mortality and amputation. Universal management strategies are not always applicable, owing to population diversity, and the Western trials may not be applicable to Japanese patients, owing to differences in demographics and clinical profiles. This paper examines the outcomes of revascularization in Japanese CLTI patients and emphasizes the benefits of tailored management.
View Article and Find Full Text PDFBackground Tuberculosis (TB) remains a major cause of global morbidity and mortality. Efforts to control TB are hampered by the lengthy and cumbersome treatment required to eradicate the infection. Bacterial persistence during exposure to bactericidal antibiotics is at least partially mediated by the bacterial stringent response enzyme, Rel .
View Article and Find Full Text PDFRapid, Accurate and Reproducible Prediction of the Glass Transition Temperature Using Ensemble-Based Molecular Dynamics Simulation.
J Chem Theory Comput
January 2025
Centre for Computational Science, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
For the computational design of new polymeric materials, accurate methods for determining the glass transition temperature () are required. We apply an ensemble approach in molecular dynamics (MD) and examine its predictions of and their associated uncertainty. We separate the uncertainty into the aleatoric contributions arising from dynamical chaos and that due to the computational scenarios chosen to compute .
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!