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原文传递 NHTSA Tire Aging Test: Development Project - Tire Innerliner Analysis.

题名：	NHTSA Tire Aging Test: Development Project - Tire Innerliner Analysis.
作者：	U. Karmarkar; A. Barbur; E. R. Terrill; M. Centea; L. R. Evans;
关键词：	tires,tire safety;polymer, rubber properties, tests, tire innerliner, tire durability, tire aging, permeability, light vehicle tires, butyl;
摘要：	As a result of the TREAD Act of 2000, NHTSA initiated an effort to develop a laboratory-based accelerated service life test for light vehicle tires (herein referred to as a tire aging test). Scientific literature attributes the changes in properties of the tire rubber compounds and their interfaces to thermal-oxidation, a chemical reaction that involves heat and oxygen. Since the innerliner is the main barrier to permeation of the pressurized inflation gas (air containing degradative oxygen) through the tire, it was desired to know material composition, thickness, and permeability of a large cross-section of passenger vehicle tire innerliners in order to understand their influence on whole-tire performance in a tire aging test. Though example formulations for tire innerliner compounds are common in literature, the actual composition of a given tires innerliner is not publicly available. Currently there is no published analytical method for determining the exact material composition of the innerliner, which led to the development of the methodology outlined in this paper. Once an optimal innerliner analysis methodology was determined, the innerliners of six tire models collected from on-vehicle service in Phoenix, AZ, and 37 additional models used in laboratory phases of the project were analyzed. Microscopy analysis was used to determine innerliner gauge and placement. Innerliner permeability at two temperatures was measured on extracted innerliner slices. The air permeability results were correlated with the innerliner compositional results. Also completed were indentation modulus profiles of the innerliners of tires retrieved from service and after accelerated laboratory aging, which were benchmarked against new tires of each model. Results showed changes in the innerliner as a function of age (for in-service tires), as well as during accelerated laboratory aging tests. It is hypothesized that the observed changes in innerliner modulus during service or accelerated aging may affect the liners permeability and/or flexibility over time. / Title Note: Final rept. / Supplementary Notes: Sponsored by National Highway Traffic Safety Administration, Washington, DC. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A07 / NTIS In-house Control Codes: dothts;12091,1101
报告类型：	科技报告