Download or read book The Effect of Radiation on the Mechanical Properties of Polyethylene Terephthalate Films written by J. T. Morgan and published by . This book was released on 1966 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Radiation on the Mechanical Properties of Polymers written by R. K. Traeger and published by . This book was released on 1964 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Radiation on the Mechanical Properties of Polyethlene Terephthalate Films written by J. T. Morgan and published by . This book was released on 1966 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NBS Monograph written by and published by . This book was released on 1959 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Influence of Uv Radiation and Vacuum on Strength and Destruction of Polymer Films written by L. M. Polyakov and published by . This book was released on 1967 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of UV radiation on the mechanical properties of poly(ethylene terephthalate) (PETP) films was studied. The changes were noted in tensile strength and deformation, and the formation of defects, i.e., cracking. The samples used were strips of PETP film, 6 mm wide, 20 mm long and 10 microns thick. The irradiated samples were subjected to tensile strength tests on a special machine. It was found that open cracks developed on the irradiated side of the samples if the irradiation took place in air. Vacuum-irradiated samples developed cracks only on deformation during the tensile test. A weakening of molecular bonds during the irradiation was assumed. Cracking began at definite stresses and deformation which decreased with an increase in the radiation dose. The tensile strength and plasticity of the irradiated films decrease with an increase in the duration of irradiation. The air-irradiated samples display a higher loss in tensile strength than the vacuum-irradiated samples, which suffer a higher loss in plasticity. Vacuum-irradiated samples form no visible defects on the surface: their surface remains smooth even after rupture of the sample. (Author).

Download or read book The Effect of Radiation on Properties of Polymers written by Laurence W. McKeen and published by William Andrew. This book was released on 2020-08-20 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Effect of Radiation on Properties of Polymers examines the effects of radiation on plastics and elastomers. Polymers are required in products or parts for a range of cutting-edge applications that are exposed to radiation, in areas such as space, medicine, and radiation processing. This book focuses on the effects of radiation exposure within that environment, providing in-depth data coverage organized by category of polymer. Aspects such as radiation impact on mechanical and thermal properties, including glass transition and heat deflection temperatures, are described, demonstrating how changes in these properties affect the performance of plastic or elastomer parts. The effect of radiation on electrical properties is also included. Supporting introductory chapters explain the key concepts of radiation, including the physical, mechanical, and thermal properties of plastics and elastomers. This is a vital resource for plastics engineers, product designers, and R&D professionals, working on products or parts for radioactive environments, as well as engineers and scientists in the medical, nuclear, and radiation processing industries. The book also supports researchers and scientists in plastics engineering, polymer processing and properties, polymer and coatings chemistry, materials science, and radiation. Brings together highly valuable data on the effect of radiation on the properties of polymers and elastomers Enables the reader to compare properties and to select the best possible materials for specific applications Supported by detailed explanations and analysis, ensuring that the reader understands how to interpret and utilize the data

Download or read book NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and published by . This book was released on 1970 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanical Properties of Polymeric Packaging Films After Radiation Sterilization written by Viriya Pungthong and published by . This book was released on 1990 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The use of radiation as a sterilization process is increasing. The well-developed technology of the radiation sterilization as applied to medical devices has assured the food industry that the process is reliable. Due to the food industry's possibility of widespread use, it is especially crucial that an appropriate packaging material be chosen so that its integrity is maintained after irradiation. This is because the commercial food packaging process carries products through more rigorous paths and channels than medical supplies. Many polymers used in the medical field show various degrees of degradation after radiation exposure, which can be determined either by visual or physical measurement. This paper studies the mechanical properties of polymeric films after irradiation doses of less than 10.0 Mrads and the extent to which this process causes film degradation. In this study, two mechanical properties will be measured: tensile strength and percentage elongation at break. Eight polymeric films commonly used in the food packaging industry are selected as the material samples. These materials will be irradiated with doses of 2.5, 5.0, 7.0, and 10.0 Mrads to determine cause-effect and dose related effect. Data collected for tensile strength and percentage elongation at break for each sample of one type of film before and after irradiation is analyzed and compared with data collected for other samples. Two primary purposes in undertaking this analysis are (1) to determine if the type of film significantly changes or degrades after irradiation, and (2) to study the relationship between the changes in mechanical properties of each film and the radiation doses of 0.0, 2.5, 5.0, 7.0, and 10.0 Mrads. In the analysis at 0.05 level of significance, polyethylene film (TD-transverse direction) is the only film which did not significantly change in either tensile strength or percentage elongation at break. The polyester/polyethylene film (MD-machine direction) significantly changed in percentage elongation at break although not in tensile strength. The rest of the film samples -PP, OPP, PETG, Polyester/PE(TD), polyester-MYLAR, PE(MD), PE/Nylon and PS film- exhibited significant changes in both mechanical properties after irradiation with doses of 2.5, 5.0, 7.0, and 10.0 Mrads. In the analysis of the degree of relationship between mechanical properties of each film and radiation doses of less than 10.0 Mrads [0.0 (non-irradiated), 2.5, 5.0, 7.0, andlO. O Mrads] found in this study can be catagorized into three types: the dose-dependent, the dose-independent, and the weak correlation. Among three film samples which exhibited the "dose-dependent" relationship, only oriented polypropylene(OPP) film was found to have the correlation between mechanical properties (both tensile strength and percentage elongation at break) and radiation doses; both mechanical properties decreased as the dose increased. Polypropylene (PP) was determined to exhibit the same correlation but only between tensile strength and radiation dose. For polyethylene (machine direction only), this correlation was found only for percentage elongation at break and radiation dose. The rest of the film samples were found to have no correlation between either mechanical property and radiation doses such as that indicated above. They are either "dose-independent" or exhibit a weak relationship between the two variables. For example, the polyester-MYLAR film exhibited obvious "dose-independent" characteristics since both mechanical properties increased significantly from 0.0 to 5.0 Mrads and then decreased at 7.0 Mrads. The films which obviously showed a very weak relationship between the mechanical properties and the radiation doses are two films which exhibited no change in mechanical properties after irradiation in the first study [PE(TD-tensile & percentage elongation) and polyester/PE (MD- percentage elongation)]. The films which exhibited a somewhat weak relationship between the two variables are PS (MD & TD- tensile & percentage elongation) and PE (MD-tensile). These last two films also showed a very small change in the mechanical properties after irradiation although not as small as the films irradiated in the first study."--Abstract.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1985 with total page 1346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Scientific and Technical Reports and Publications for 1969 A Selected Listing written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1970 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Ultraviolet Irradiation on Selected Plastic Films in Vacuum written by Evelyn Anagnostou and published by . This book was released on 1965 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected plastic films which had possible application as encapsulants for thin-film cadmium sulfide solar cells were irradiated in vacuum by ultraviolet light below 3000 angstroms for various lengths of time up to 5266 hours. The light intensity was between 0.67 and 1 times the integrated solar intensity below 3000 angstroms at 1 astronomical unit. The change in optical trans-mission with irradiation time was measured from 0.35 to 2.7 microns, and changes in percent elongation and breaking strength were measured at room temperature. Of the films tested, the most resistant to damage was H-film, a polyimide, and weather-durable Mylar was the next most resistant.

Download or read book Handbook of Plastic Films written by Elsayed M. Abdel-Bary and published by iSmithers Rapra Publishing. This book was released on 2003 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plastic films are high-performance materials which play an essential part in modern life. The plastics films industry uses state-of-the-art manufacturing processes and is continuously seeking out new technologies to improve its performance. The understanding of the nature of plastic films, their production techniques, applications and their characterisation is essential for producing new types of plastic films. This handbook has been written to discuss the production and main uses of plastic films. Plastic films are high-performance materials which play an essential part in modern life. Plastic films are mostly used in packaging applications but as will be seen from this book they are also used in the agricultural, medical and engineering fields. The plastics films industry uses state-of-the-art manufacturing processes and is continuously seeking out new technologies to improve its performance. The understanding of the nature of plastic films, their production techniques, applications and their characterisation is essential for producing new types of plastic films. This handbook has been written to discuss the production and main uses of plastic films.

Download or read book Molecular Orientation and Mechanical Anisotropy in Polyethylene Polypropylene and Poly ethylene Terephthalate Films written by Howard L. Price and published by . This book was released on 1969 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular orientation and mechanical isotropy in polyethylene, polypropylene, and polyethylene terephthalate films.

Download or read book Food Irradiation written by V.M Wilkinson and published by CRC Press. This book was released on 1997-11-30 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference is an ABC on food irradiation on the one hand and an encyclopedia of food irradiation on the other. The authors have painstakingly compiled all terminologies related to this technology and have listed items ranging from Aeromanos to Yersinia for microbiological aspects; from Apple to Poultry to Wheat which can benefit from irradiation; vitamins in food which may be affected by irradiation; regulatory aspects including various methods of detection of irradiated food; consumer acceptance and commercial applications to date, etc. -Paisan Loaharanu, Head, Food Preservation Section, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Vienna

Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1971 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of the National Bureau of Standards Catalog written by United States. National Bureau of Standards and published by . This book was released on 1972 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: