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A comparative analysis of the need for various knowledge and skills in plastics as viewed by Texas high school plastic teachers and Texas plastics industries

Description: This was a comparative study in which Texas teachers of industrial plastics and the employers of Texas plastic industries were surveyed in order to evaluate the need for various knowledge and skills of the plastics industry.
Date: December 1975
Creator: Reeve, Edward Lee
Partner: UNT Libraries

Phthalates in Plastics and Possible Human Health Effects

Description: This report provides background information about human exposure to phthalates in plastics and possible health effects. It also discusses evaluation and regulation of pthalates in the U.S. and internationally, as well as related legislative proposals.
Date: July 29, 2008
Creator: Schierow, Linda-Jo & Lee, Margaret Mikyung
Partner: UNT Libraries Government Documents Department

Fracture Toughness Testing of Plastics under Various Environmental Conditions

Description: The primary objective of this study is to test the applicability to plastics of a fracture toughness testing tool developed for metals. The intent is to study pre-test conditioning of several plastic materials and the effect of the depth of the razor notch cut in the chevron notched fracture toughness test specimens. The study includes the careful preparation of samples followed by conditioning in various environments. Samples were subjected to laboratory air for a specific duration or to a controlled temperature-humidity condition as per the ASTM D1870. Some of the samples were subjected to vacuum conditioning under standard test specifications. Testing was conducted using the conventional three-point bend test as per ASTM D5045-95. ASTM E1304, which sets a standard for short rod and bar testing of metals and ceramics provides some basis for conducting chevron notched four-point bend tests to duplicate the toughness tool. Correlation of these results with the ASTM test samples is determined. The four-point bend test involves less specimen machining as well as time to perform the fracture toughness tests. This study of fracture toughness testing has potential for quality control as well as the fracture property determination.
Date: December 1997
Creator: Velpuri, Seshagirirao V.
Partner: UNT Libraries

Plastics, Their History and Use

Description: Since the civilization, population and living standards of the peoples of the world have increased in such gigantic proportions, especially in the last fifty years; and since the supply of natural resources cannot meet the demand, we have of necessity had to find new materials to take their place. These new materials must fulfill two purposes; namely, to take the place of the natural resources so wantonly destroyed and to meet requirements that the natural materials are not able to meet. Foremost among these new materials are the synthetic resinous materials known as plastics. Plastics are one way of getting around the fact that Nature has not thought of everything. The ability of man to imagine things that he does not see and to fashion these things from what he finds around him is responsible for what we call progress -- and for plastics.
Date: August 1946
Creator: Sealy, Emma L.
Partner: UNT Libraries

An Analysis of a Curriculum Guide Developed for Industrial Plastics as Listed in Bulletin 615 of the Texas Education Agency

Description: This study surveyed teachers of industrial plastics and personnel of the plastics industry to evaluate an industrial-plastics curriculum guide. The respondents felt that there was no unnecessary material in the guide, that additional information should be added to several of the plastics processes in the curriculum guide, and that most of the subject areas in the guide should be studied for no less than an hour and no more than five hours.
Date: December 1974
Creator: Smith, William Elton
Partner: UNT Libraries

Error analysis for fast scintillator-based ICF burn history measurements

Description: Plastic scintillator material acts as a neutron-to-light converter in instruments that make ICF burn history measurements. Light output for a detected neutron has a fast rise time (420 ps) and a relatively long decay constant (1.2 ns). For a burst of neutrons whose duration is much shorter than the decay constant, instantaneous light output is approximately proportional to the integral of the neutron interaction rate with the scintillator material. Burn history is obtained by deconvolving the exponential decay from the recorded signal.
Date: July 6, 1998
Creator: Lerche, R A & Ognibene, T J
Partner: UNT Libraries Government Documents Department

Plastic Heat Exchangers : A State-of-the-Art Review

Description: Significant increases in energy utilization efficiency can be achieved through the recovery of low-temperature rejected heat. This energy conserving possibility provides incentive for the development of heat exchangers which could be employed in applications where conventional units cannot be used. Some unique anticorrosion and nonstick characteristics of plastics make this material very attractive for heat recovery where condensation, especially sulfuric acid, and fouling occur. Some of the unique characteristics of plastics led to the commercial success of DuPont's heat exchangers utilizing polytetrafluoroethylene (trade name Teflon) tubes. Attributes which were exploited in this application were the extreme chemical inertness of the material and its flexibility, which enabled utilization in odd-shaped spaces. The wide variety of polymeric materials available ensures chemical inertness for almost any application. Lower cost, compoundability with fillers to improve thermal/mechanical properties, and versatile fabrication methods are incentives for many uses. Also, since many plastics resist corrosion, they can be employed in lower temperature applications (< 436 K), where condensation can occur and metal units have been unable to function. It is clear that if application and design can be merged to produce a cost-effective alternate to present methods of handling low-temperature rejected heat, then there is significant incentive for plastic heat exchangers, to replace traditional metallic heat exchangers or to be used in services where metals are totally unsuited.
Date: July 1979
Creator: Miller, David; Holtz, Robert E.; Koopman, R. Nelson; Marciniak, Thomas J. & MacFarlane, Donald R.
Partner: UNT Libraries Government Documents Department

A Study of the Development and Use of Plastics in Industry with Proposals for the Adaptation of Plastics as a Phase of Industrial Arts

Description: The purpose of this study is twofold. First, it is to present evidence of the ever-increasing development and use of plastics by industry. A second purpose after presentation of evidence, is to propose that industrial arts must adapt work with plastics as a phase of its program in order to meet present-day needs of the growing generation.
Date: 1951
Creator: James, A. S., Jr.
Partner: UNT Libraries

An Experimental Investigation of a Prescription for Identifying Plastic Strain

Description: A series of experiments is described in which a novel prescription for the identification of plastic strain is tested to determine its validity in the context of the strain-space formulation of rate-independent plasticity. Biaxial experiments were performed on several thin-walled aluminum 1100-O cylindrical specimens.
Date: February 29, 2000
Creator: Brown, A.A.; Casey, J. & Nikkel, D.J.
Partner: UNT Libraries Government Documents Department

A Study of the Different Types of Plastics to Ascertain Their Suitability as a Material in the Construction of Projects in Industrial Arts Programs

Description: This study will not attempt to analyze the various types of plastics presented with respect to the chemical ingredients and chemical processes necessary for their manufacture, but it will deal primarily with the selection and use of the various types of plastics as materials suitable for use in the construction of projects in an industrial arts program.
Date: August 1954
Creator: Fredrickson, Wade O.
Partner: UNT Libraries

A Comprehensive Theory of Yielding and Failure for Isotropic Materials

Description: A theory of yielding and failure for homogeneous and isotropic materials is given. The theory is calibrated by two independent, measurable properties and from those it predicts possible failure for any given state of stress. It also differentiates between ductile yielding and brittle failure. The explicit ductile-brittle criterion depends not only upon the material specification through the two properties, but also and equally importantly depends upon the type of imposed stress state. The Mises criterion is a special (limiting) case of the present theory. A close examination of this case shows that the Mises material idealization does not necessarily imply ductile behavior under all conditions, only under most conditions. When the first invariant of the yield/failure stress state is sufficiently large relative to the distortional part, brittle failure will be expected to occur. For general material types, it is shown that it is possible to have a state of spreading plastic flow, but as the elastic-plastic boundary advances, the conditions for yielding on it can change over to conditions for brittle failure because of the evolving stress state. The general theory is of a three dimensional form and it applies to full density materials for which the yield/failure strength in uniaxial tension is less than or at most equal to the magnitude of that in uniaxial compression.
Date: August 10, 2006
Creator: Christensen, R M
Partner: UNT Libraries Government Documents Department

Expanded plastics used as sculptural patterns for burn out in ceramic shell molds

Description: The purpose of this investigation was to develop a method of burning out expanded plastic patterns invested in ceramic shell molds. Technological information suggested that the procedure was not feasible because plastic expansion or gas combustion invariably spoiled the mold. However, burning out expanded plastic patterns would provide a practical method of using such materials in the sculptor's studio; combined with ceramic shells, the patterns would promote accurately detailed castings with ease and convenience.
Date: August 1976
Creator: Penland, Lilburn C.
Partner: UNT Libraries

Final Report for DOE Project DE-FC07-99CH11010

Description: Department of Energy award number DE-FC07-99CH11010, Enhanced Utilization of Corn Based Biomaterials, supported a technology development program sponsored by Cargill Dow LLC from September 30, 1999 through June 30, 2003. The work involved fundamental scientific studies on poly lactic acid (PLA), a new environmentally benign plastic material from renewable resources. DOE funds supported academic research at the Colorado School of Mines and the National Renewable Energy Laboratory (NREL), and industry cost share was directed towards applied research into new product development utilizing the fundamental information generated by the academic partners. Under the arrangement of the grant, the fundamental information is published so that other companies can utilize it in evaluating the applicability of PLA in their own products. The overall project objective is to increase the utilization of PLA, a renewable resource based plastic, currently produced from fermented corn sugar.
Date: October 22, 2003
Creator: Randall, Jed & Kean, Robert
Partner: UNT Libraries Government Documents Department

A Study of Safety in the Industrial Plastics Laboratories in the Secondary Schools of the Fort Worth Independent School District

Description: This study was conducted in order to determine what safety practices and procedures were employed in the industrial plastics laboratories in the secondary schools of the Fort Worth Independent School District. Data were obtained from literature in the field of safety education in industrial arts and from an information form mailed to the teachers of industrial plastics in the Fort Worth Independent School District. Hazardous conditions were found to exist in a majority of the laboratories due to a lack of sufficient floor space and work stations and the absence of proper guards on machines, proper storage facilities for flammable liquids, painted danger zones and nonskid surfaces on floors around machines.
Date: August 1976
Creator: Curtis, Ronald W.
Partner: UNT Libraries

Energy efficiency and pollution prevention assessment protocol in the polymer processing industries. Final report

Description: This report was developed from experiences with three New Jersey firms and is intended to be a guide for conducting analyses on resource (energy and raw materials) utilization and pollution (solid waste, air and water emissions) prevention in plastics processing plants. The protocol is written on the assumption that the analysis is to be done by an outside agency such as a consulting firm, but it also can be used for internal audits by plant teams. Key concepts in this analysis were adapted from life cycle analysis. Because of the small sample of companies studied, the results have to be considered high preliminary, but some of the conclusions will probably be confirmed by further work.
Date: March 31, 1998
Creator: Nardone, John; Sansone, Leonard; Kenney, William; Christodoulatos, Christos & Koutsospyros, Agamemnon
Partner: UNT Libraries Government Documents Department

Bisphenol A (BPA) in Plastics and Possible Human Health Effects

Description: This report discusses Bisphenol A (BPA). BPA is used to produce certain types of plastic that are used in thousands of formulations for myriad products. Containers made with these plastics may expose people to small amounts of BPA in food and water. Medical devices and other more ubiquitous products, such as thermal paper coatings, also may contribute significantly to human exposure. Some animal experiments have found that fetal and infant development may be harmed by small amounts of BPA, but scientists disagree about the value of the animal studies for predicting harmful effects in people.
Date: August 13, 2010
Creator: Schierow, Linda-Jo & Lister, Sarah A.
Partner: UNT Libraries Government Documents Department

Polishing compound for plastic surfaces

Description: A polishing compound for plastic surfaces is disclosed. The compound contains by weight approximately 4 to 17 parts at least one petroleum distillate lubricant, 1 to 6 parts mineral spirits, 2.5 to 15 parts abrasive particles, and 2.5 to 10 parts water. The abrasive is tripoli or a similar material that contains colloidal silica. Preferably, most of the abrasive particles are less than approximately 10 microns, more preferably less than approximately 5 microns in size. The compound is used on PLEXIGLAS{sup TM}, LEXAN{sup TM}, LUCITE{sup TM}, polyvinyl chloride (PVC) and similar plastic materials whenever a smooth, clear polished surface is desired.
Date: January 1, 1993
Creator: Stowell, M.S.
Partner: UNT Libraries Government Documents Department

Quantitative in situ nanoindentation of aluminum films

Description: We report the development of a method for quantitative, in situ nanoindentation in an electron microscope and its application to study the onset of deformation during the nanoindentation of aluminum films. The load-displacement curve developed during in situ nanoindentation shows the characteristic ''staircase'' instability at the onset of plastic deformation. The instability corresponds to the first appearance of dislocations in previously defect-free grains, and occurs at a force near that measured in conventional nanoindentation experiments on similarly oriented Al grains. Plastic deformation proceeds through the formation and propagation of prismatic loops punched into the material, and half-loops that emanate from the sample surface. This new experimental technique permits the direct observation of the microstructural mechanisms that operate at the onset of deformation.
Date: April 4, 2001
Creator: Minor, Andrew M.; Stach, Eric A. & Morris, J. W., Jr.
Partner: UNT Libraries Government Documents Department