Melts of commercial high-density polyethylene (M — w = 36–85 6 10) were subjected to the hydrodynamics of a Haake Rheocord blender at temperatures (T) spanning the normal processing range (190–2608C), far beyond the disappearance of solid crystals at about 1408C. Torque measurements revealed a peculiar dependence on T, including transitions at about 2088C and 2278C, and non-Arrhenius behavior a...

We analyze a model of hypercubic random surfaces with an extrinsic curvature term in the action. We find a first order phase transition at finite coupling separating a branched polymer from a stable flat phase.

Gasand aerosol-phase measurements of oxidants, biogenic volatile organic compounds (BVOCs) and organic nitrates made during the Southern Oxidant and Aerosol Study (SOAS campaign, Summer 2013) in central Alabama show that a nitrate radical (NO3) reaction with monoterpenes leads to significant secondary aerosol formation. Cumulative losses of NO3 to terpenes are correlated with increase in gasand...

Basic concept of phase-transfer catalysis (PTC), its field of applications and specific features as the most general, efficient, and environment-friendly green methodology of organic synthesis, particularly for industrial processes, is discussed. Organic synthesis is the principal way to produce chemical products of practical applications such as pharmaceuticals, plant protection agents, dyes, ...

influence the driving force. Thermodynamic quantities determined from homologous series retention throughout the entire composition range may lead to a better understanding of the driving force and fundamental retention mechanism that results from the inherent differences in chromatographic solvation between acetonitrile and methanol. Tan and co-workers (11) showed that stationary-phase composi...

Organic aerosols are ubiquitous in the atmosphere and play a central role in climate, air quality, and public health. The aerosol size distribution is key in determining its optical properties and cloud condensation nucleus activity. The dominant portion of organic aerosol is formed through gas-phase oxidation of volatile organic compounds, so-called secondary organic aerosols (SOAs). Typical e...

Solutions of anionic liquid ion-exchangers in organic solvents are potentially useful for extracting steroidal glucosiduronic acids from biological fluids and for purifying mixtures of these acids by chromatography. If a glucosiduronic acid is to be isolated in pure form after either of these procedures, it is necessary to separate it from the ion-exchanger. Separation from an organic solution ...