ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTImmortal CO2/Propylene Oxide Copolymerization: Precise Control of Molecular Weight and Architecture Various Block CopolymersAnish Cyriac, Sang Hwan Lee, Jobi Kodiyan Varghese, Eun Seok Park, Ji Hae Bun Yeoul Lee*View Author Information Department Science Technology, Ajou University, Suwon 443-749, Korea*Corresponding author. E-mail: [email protected]Cite this: Macromolecules 2010, 43, 18, 7398–7401Publication...

Low-molecular-weight poly(propylene carbonate)s bearing –OH groups at both ends (PPC-diols) are prepared by feeding protic chain-transfer agents (1,2-propanediol, terephthalic acid, 2,6-naphthalenedicarboxylic and phenylphosphonic acid) in the CO2/propylene oxide copolymerization catalyzed a highly active Salen–Co(III) complex tethered four quaternary ammonium salts. The generated low-molecular-weight PPC-diols used situ for formation of thermoplastic polyurethanes through subsequent...

A preparative method for a flame-retarding poly(propylene carbonate) (PPC) was demonstrated by employing diphenylphosphinic acid (Ph2P(O)(OH)), phenylphosphonic (PhP(O)(OH)2), or phosphoric (P(O)(OH)3) as chain transfer agent in the immortal CO2/propylene oxide copolymerization catalyzed highly active catalyst, cobalt(III) complex of Salen-type ligand tethered four quarternary ammonium salts (1). High turnover frequencies 10 000–20 000 h−1 (700–1300 g-polymer per g-cat·h) were maintained...

When a small amount of vinylcyclohexene dioxide ([diepoxide]/[cat] = 60, 0.14 w% propylene oxide) is additionally added in CO2/propylene oxide copolymerization catalyzed by highly active catalyst, cobalt(III) complex Salen-type ligand tethered four quaternary ammonium salts (2), some polymer chains are connected consequently resulting an increased molecular weight up to Mw 606000 and broadened distribution. The same chain-connecting process also applicable the presence chain transfer agent,...

Background Early discrimination between transient and persistent par-solid ground-glass nodules (PSNs) at CT is essential for patient management. The objective of our study was to retrospectively investigate the value texture analysis in differentiating pulmonary PSNs addition clinical features. Methods This retrospective performed with IRB approval a waiver requirement patients' informed consent. From January 2007 October 2009, we identified 77 individuals (39 men 38 women; mean age, 55...

The recent American Heart Association guidelines added a sixth link in the chain of survival highlighting recovery and emphasized importance psychiatric outcome for survivors out-of-hospital cardiac arrest (OHCA). prevalence disorders among this population was higher than that general population.To examine depression or anxiety association these conditions with long-term mortality individuals who survive OHCA.A longitudinal population-based cohort study conducted to analyze prognosis...

Out-of-hospital cardiac arrest (OHCA) is a major public health problem and leading cause of death worldwide. Previous studies have focused on improving the survival people who had OHCA by analyzing short-term outcomes, such as return spontaneous circulation, 30-day survival, to discharge. Research has been conducted prehospital prognostic factors improve patients with OHCA, among which association between socioeconomic status (SES) reported. SES could affect bystander cardiopulmonary...

For sustainable soil management, there is an increasing demand for quality, resilience, and health assessment. After remediation of petroleum hydrocarbon (PHC)-contaminated soils, changes in the physicochemical ecological characteristics were investigated. Two kinds technologies applied to contaminated soils: land farming (LF) high temperature thermal desorption (HTTD). As a result total hydrocarbons (TPH), PHC-contaminated soils efficiently remediated by LF HTTD. The could not be completely...

The structural behaviour of a windshield wiper system and the dynamic rubber blade are investigated using finite element analysis. Non-linear contact analysis was performed to examine influences design variables such as curvature primary beam, thickness yoke, rotational angle yoke steel beam on distribution force along length, effects vertical load coefficient friction vibrational were transient Experimental validation conducted by measuring blade. experimental data simulated results show...

Bioavailability of cadmium (Cd) and arsenic (As) can be different depending on soil pH. For this reason, main purpose research was to compare bioavailability Cd As in agricultural field under varied pH extractants. Bioavailable fraction extracted with <TEX>$CaCl_2$</TEX>, <TEX>$NaNO_3$</TEX>, DTPA, EDTA, low molecular weight organic acids (LMWOAs). Soil samples cultivated crops were collected at the range 4.5-8.5 correlation analysis conducted between bioavailable total concentration crops....

An acute brain lesion (ABL) identified by magnetic resonance imaging (MRI) after carbon monoxide (CO) poisoning is a strong prognostic factor for the development of delayed neuropsychiatric syndrome (DNS). This study aimed to identify predictors ABLs on MRI in patients with CO poisoning. was multicenter prospective registry-based observational conducted at two tertiary hospitals. A total 1,034 were included. Multivariable logistic regression analysis showed that loss consciousness (LOC)...

Delayed neuropsychiatric sequelae (DNS) are a severe complication of carbon monoxide (CO) poisoning, and predicting DNS is difficult. This study aimed to investigate whether cardiac markers can be used as biomarkers predict occurrence following acute CO poisoning. was retrospective observational that included patients with poisoning who visited two emergency medical centers in Korea from January 2008 December 2020. The primary outcome the associated laboratory results. Of 1327 967 were...

The dilute solution model is quite widely used because the chemical potential more easily defined than that in sub-lattice model. In present study, thermodynamic for Fe-Mn-Si-Nb-Ti-V-C system was conducted by evaluating Wagner interaction parameters. data this work collected and modified means of TCFE 2000-database Thermo-Calc up-to date references. relationship parameters(L) parameters derived. composition dependency reference state higher order excess Gibbs energy were considered to...

This study explores the resistive heating characteristics of discontinuous carbon fiber (CF)-epoxy composites. Test samples including 1, 3, and 5 wt.% CF were fabricated using sonication cast molding processes. For performance characterization, DC currents applied to composite samples, surface temperatures evaluated visually quantitatively an infrared camera. To estimate thermal composites verify experimental results, finite element analyses performed. The mechanism was investigated in...

In this paper, nano manufacturing using the FPN (Fountain Pen Nano-Lithography) with active membrane pumping is investigated. This has integrated chamber, micro channel, and high capacity reservoir for continuous ink feed. The most important aspect in probe provided control of fluid injection chamber. flow rates channel by capillary force are theoretically analyzed two different working fluids, DPD (diphenyldichlorosilane) water, including cantilever deflection mass membrane. theoretical...