Consideration of the Degradation of Polymer Systems on the Basis of Reduced Viscosity Loss

Reappraisal of the GL‐O Reference Material for K‐Ar Dating: New Insight from Microanalysis, Single‐Grain and Milligram Ar Measurements

“…This horizon was chosen because of the highly evolved nature of its pellets and its known history. It was used to anchor the Albian-Cenomanian boundary in timescale calibration attempts Hunziker 1982, Fiet et al 2006), which were later found to be inaccurate by precise dating of hightemperature minerals from intercalated tuff horizons (Selby 2009, Quidelleur et al 2011. Although its K-Ar age of 95.03 ± 1.11 Ma is in disagreement with the numerical value for the Albian-Cenomanian boundary on the most recent geological timescale, GL-O is considered to be a highly homogeneous datable material, which has K and Ar contents that are reproducible for the calibration of K-Ardating equipment.…”

DRAG REDUCTION - Polymer Solutions, Soap Solutions, and Solid Particle Suspensions in Pipe Flow

“…Nearly neutrally buoyant particles which have caused drag reduction in water suspensions are wood pulp and nylon fibers of high length-to-diameter ratios. Wood pulp drag reduction has been reported by Robertson and Mason (63) and by Daily et al (9,72). Nylon fibers were used as model fibers for the study of such drag reduction by Daily and Bugliarello (72) and by Bobkowicz and Gauvin (6,7).…”

“…Wood pulp drag reduction has been reported by Robertson and Mason (63) and by Daily et al (9,72). Nylon fibers were used as model fibers for the study of such drag reduction by Daily and Bugliarello (72) and by Bobkowicz and Gauvin (6,7).…”

“…A number of polymer degradation studies in oil solvents have been made in an attempt to obtain information on viscosity losses in viscosity-index-improved oil (24,30,72,82). Unfortunately, no efforts were made to find average-molecular-weight losses, much less changes in molecular-weight distributions.…”