Poly(-isopropylacrylamide) (PNIPA), as a smart polymer, can be applied for drug delivery systems. This amorphous polymer can be exposed on a structural recovery process during the storage and transport of medicaments. For the physical aging times up to one year, the structural recovery for PNIPA was studied by advanced thermal analysis. The structural recovery process occurred during the storage of amorphous PNIPA below glass transition and could be monitored by the differential scanning calorimetry (DSC). The enthalpy relaxation (recovery) was observed as overshoot in change heat capacity at the glass transition region in the DSC during heating scan. The physical aging of PNIPA was studied isothermally at 400.15 K and also in the non-isothermal conditions. For the first time, the structural recovery process was analyzed in reference to absolute heat capacity and integral enthalpy in frame of their equilibrium solid and liquid PNIPA.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7503768 | PMC |
| http://dx.doi.org/10.3390/molecules25173810 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A SERS/colorimetric biosensor based on AuNSs@Ag core-shell Prussian blue nanozyme for non-interference and rapid detection of Staphylococcus aureus in milk.
Mikrochim Acta
January 2025
College of Chemistry and Chemical Engineering, Xinjiang Normal University, Urumqi, 830054, China.
A AuNSs@PB@Ag-Apt surface-enhanced Raman scattering (SERS) probe has been developed by embedding Prussian blue (PB) between Au core and Ag shell. The PB SERS probe illustrates strong SERS activity in the Raman silent region of 2070 cm, and has a zero background signal, ensuring high sensitivity for the detection of Staphylococcus aureus (S. aureus).
View Article and Find Full Text PDFUnderstanding the Needs of Young and Middle-Aged Chinese People Who Have Experienced a Stroke Who Have Not Successfully Returned to Work: A Qualitative Study.
Health Expect
February 2025
College of Nursing, Xinyang Vocational and Technical College, Xin Yang, Henan, China.
Objectives: The study aims to understand the return to work (RTW) needs of young and middle-aged people who have experienced a stroke and to contribute to the development of supportive RTW services.
Design: A qualitative study employing the phenomenological method.
Participants: Eleven young and middle-aged people who have experienced a stroke participated in the study.
Overcoming Energy-Scaling Barriers: Efficient Ammonia Electrosynthesis on High-Entropy Alloy Catalysts.
Adv Mater
January 2025
Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, SAR, 999077, P. R. China.
Electrochemically converting nitrate (NO ) to value-added ammonia (NH) is a complex process involving an eight-electron transfer and numerous intermediates, presenting a significant challenge for optimization. A multi-elemental synergy strategy to regulate the local electronic structure at the atomic level is proposed, creating a broad adsorption energy landscape in high-entropy alloy (HEA) catalysts. This approach enables optimal adsorption and desorption of various intermediates, effectively overcoming energy-scaling limitations for efficient NH electrosynthesis.
View Article and Find Full Text PDFKey attributes of nitrocellulose-based energetic materials and recent developments.
Heliyon
January 2025
Centre for Tropicalization (CENTROP), Defence Research Institute, Universiti Pertahanan Nasional Malaysia, Kem Sungai Besi, 57000, Kuala Lumpur, Malaysia.
Nitrocellulose (NC)-based propellants have played a pivotal role in the development of energetic materials for both military and civilian applications. This review offers a comprehensive exploration of NC-based propellants, tracing their evolution from their historical origins as smokeless gunpowder to modern advancements. It discusses the chemical composition and classifications of NC propellants, along with continuous efforts to refine smokeless powder formulations through studies on smoke formation, residues, and additives.
View Article and Find Full Text PDFModeling and optimization of surface modification process of ultrafiltration membranes by guanidine-based deep eutectic solvent.
Heliyon
January 2025
Department of Applied Chemistry, Faculty of Chemistry, Razi University, 67144-14971, Kermanshah, Iran.
Low performance and the high fouling tendency of Polyetherimide (PEI) membranes prevent their widespread commercial utility. In this study, we utilized a deep eutectic solvent (DES) as a versatile agent for surface modification of the PEI membrane using a simple and sustainable method. To attain an efficient PEI membrane, modeling and optimization of the modification condition were conducted via response surface methodology (RSM).
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!