AI Article Synopsis
- A series of novel organogels were created using poly(propylene oxide) (PPO) that was modified with urea groups for quick gel formation and strong structural properties in various solvents.
- Three types of PPO with different molecular weights (430, 2000, and 4000 g mol(-1)) were utilized, each having amino end groups, and were gelled successfully in solvents like carbon tetrachloride and toluene.
- The quality of these gels was assessed using the Flory-Huggins parameter, revealing that lower χ values indicated stronger and clearer gels, therefore suggesting that polymer-solvent interactions can effectively predict gel performance.
Article Abstract
A series of novel organogels were synthesized from poly(propylene oxide) (PPO) functionalized with main chain urea moieties which provided rapid gelation and high moduli in a variety of solvents. Three different molecular weight PPOs were used in this study: 430, 2000, and 4000 g mol(-1), each with α,ω-amino-end groups. Four urea groups were introduced into the main chain by reaction with hexamethylene diisocyanate followed by subsequent reaction with a monofunctional alkyl or aromatic amine. This PPO/urea gelator was found to form gels in carbon tetrachloride, chloroform, dichloromethane, toluene, ethyl acetate, and tetrahydrofuran. Among these, carbon tetrachloride and toluene were found to be the best solvents for this system, resulting in perfectly clear gels with high moduli at low mass fraction for PPO-2000 systems. Flory-Huggins polymer-solvent interaction parameter, χ, was found to be a useful indicator of gel quality for these systems, with χCCl4/PPO-2000 < 0.5 and χtoluene/PPO-2000≈ 0.5. Systems with χ parameters >0.5 were found to form low moduli gels, indicating that for these systems, polymer-solvent interaction parameters can be a useful predictor of gel quality in different solvent systems.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c6sm00431h | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Systemic calcinosis in horses: Pathological and genetic aspects.
Equine Vet J
January 2025
Setor de Patologia Veterinária, Universidade Federal Do Rio Grande Do Sul, Porto Alegre, RS, Brazil.
Background: In horses, systemic calcinosis is a rare syndrome characterised by muscle lesion associated with the mineralisation of large muscle groups or other organs, in the absence of an alternative cause for the calcification, such as toxic, enzootic or metabolic. Molecular and histopathological aspects of the disease are still poorly elucidated.
Objectives: To describe the epidemiological, pathological and molecular aspects of systemic calcinosis in a convenience sample of six horses submitted to necropsy in the Southern and Midwestern regions of Brazil.
A galacturonic acid-rich polysaccharide from Citrus medica 'fingered' alleviated the dextran sulfate sodium-induced ulcerative colitis.
Int J Biol Macromol
January 2025
School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China. Electronic address:
Ulcerative colitis (UC) treatment is often limited by adverse reactions and high recurrence rates, highlighting the need for safer, more effective therapies. Citrus medica 'Fingered' (C. medica), known for its anti-inflammatory properties, remains underexplored, particularly its polysaccharide components.
View Article and Find Full Text PDFPreventing zoonotic spillover through regulatory frameworks governing wildlife trade: A scoping review.
PLoS One
January 2025
School of Health Policy and Management, York University, Toronto, Ontario, Canada.
Wildlife trade can create adverse impacts for biodiversity and human health globally, including increased risks for zoonotic spillover that can lead to pandemics. Institutional responses to zoonotic threats posed by wildlife trade are diverse; understanding regulations governing wildlife trade is an important step for effective zoonotic spillover prevention measures. In this review, we focused on peer-reviewed studies and grey literature conducted on regulatory approaches that govern domestic and international wildlife trade in order to assess the role of local, national and global-level institutions in the prevention of zoonotic spillover and infection transmission between humans.
View Article and Find Full Text PDFEffects of implant status and breed type on feedlot performance, carcass characteristics, sera metabolites, and immunohistochemical responses in finishing steers.
J Anim Sci
January 2025
Department of Animal and Food Sciences, Texas Tech University, Lubbock, TX USA.
The number of beef × dairy animals entering feedlots has increased, but the response of beef × dairy cattle to growth-promoting implants has not been well characterized. The objective of this study was to evaluate the effects of breed type and implant administration on live performance, carcass characteristics, sera metabolites, and immunohistochemical (IHC) outcomes. Forty-eight steers (average body weight [BW] = 417±22 kg) were sorted by breed into groups of predominantly Angus (B), black-hided beef × primarily Holstein (B×D), or Holstein (D), and half of the steers within each breed type were administered a steroidal implant.
View Article and Find Full Text PDF[Roles of ferroptosis in the development of diabetic nephropathy].
Zhejiang Da Xue Xue Bao Yi Xue Ban
December 2024
Department of Endocrinology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu 610072, China.
Diabetic nephropathy is a common microvascular complication of diabetes mellitus and one of the main causes of death in patients with diabetes mellitus. Ferroptosis is a newly discovered iron-dependent regulated cell death, which may contribute to the pathogenesis and development of diabetic nephropathy. Adenosine monophosphate-activated protein kinase (AMPK)-mediated ferroptosis-related signaling pathways can slow down the progression of diabetic nephropathy, but excessive activation of AMPK signaling pathway may induce cells to undergo autophagic death.
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!