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2. Effects of process temperature on the weathering performance of rigid poly(vinyl chloride)

Author

Burch E. Zehner and Jeff Hartley

Subjects
Marketing, Materials science, Polymers and Plastics, General Chemical Engineering, Color shift, Weathering, Izod impact strength test, General Chemistry, Atmospheric temperature range, Vinyl chloride, Poly vinyl chloride, chemistry.chemical_compound, chemistry, Materials Chemistry, Extrusion, Composite material
Abstract

Elevated process temperatures can accompany current high extrusion rates of rigid poly(vinyl chloride). Various colored weatherable siding compounds were studied in the processing temperature range of 193°C to 227°C. The extruded compounds showed only minor color shifts due to increased melt temperatures. Outdoor exposure through four years in Arizona, Florida, and Ohio demonstrated typical color change but did not exhibit significant color shift relating to the initial processing temperatures. The samples extruded at elevated melt temperatures did demonstrate reduced impact strengths prior to outdoor exposure. Florida-exposed and Ohio-exposed samples lost impact strength throughout five years of exposure, with the samples processed at higher temperatures continuing to show lower impacts over time.

Published
2003

3. The Dean and the Department Head a Special Relationship

Author

Burch E. Oglesby and J. T. Sandefur

Subjects
Medical education, Teamwork, medicine.medical_specialty, Higher education, business.industry, Head (linguistics), media_common.quotation_subject, Physical Therapy, Sports Therapy and Rehabilitation, Education, Special Relationship, Family medicine, Medicine, Orthopedics and Sports Medicine, business, media_common
Published
1982

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