Effect of Retting on Surface Chemistry and Mechanical Performance Interactions in Natural Fibers for High Performance Polymer Composites

Effect of Retting on Surface Chemistry and Mechanical Performance Interactions in Natural Fibers for High Performance Polymer Composites

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Date: May 2013
Creator: Ramesh, Dinesh
Description: Sustainability through replacement of non-renewable fibers with renewable fibers is an ecological need. Impact of transportation costs from South-east Asia on the life cycle analysis of the composite is detrimental. Kenaf is an easily grown crop in America. Farm based processing involves placing the harvested crop in rivers and ponds, where retting of the fibers from the plant (separation into fibers) can take 2 weeks or more. The objective of this thesis is to analyze industrially viable processes for generating fibers and examine their synergistic impact on mechanical performance, surface topography and chemistry for functional composites. Comparison has been made with commercial and conventional retting process, including alkali retting, enzymatic retting, retting in river and pond water (retting occurs by natural microbial population) with controlled microbial retting. The resulting kenaf fibers were characterized by dynamic mechanical analysis (DMA), Raman spectroscopy (FT-Raman), Fourier transform infrared spectroscopy (FT-IR), polarized optical microscopy (POM), X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM) optical fluorescence microscopy, atomic force microscopy (AFM) and carbohydrate analysis. DMA results showed that pectinase and microbe treated fibers have superior viscoelastic properties compared to alkali retting. XPS, Raman, FT-IR and biochemical analysis indicated that the controlled microbial and pectinase retting was ...
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Fabric Magic

Fabric Magic

Date: unknown
Creator: Elwyn, Robert & Lyon, Sumner
Description: A short film examining the strengths of three Milliken-made fabric blends - nylon and wool, orlon and wool, and dacron and wool.
Contributing Partner: UNT Media Library
Military Uniforms: Issues Related to the Supply of Flame Resistant Fibers for the Production of Military Uniforms

Military Uniforms: Issues Related to the Supply of Flame Resistant Fibers for the Production of Military Uniforms

Date: June 30, 2011
Creator: United States. Government Accountability Office.
Description: Correspondence issued by the Government Accountability Office with an abstract that begins "Prior to Operation Enduring Freedom and Operation Iraqi Freedom, Department of Defense (DOD) personnel with flame resistant (FR) uniforms were mainly aviators, fuel handlers, and tank crews. With the growing prevalence of the improvised explosive device (IED) threat, all ground forces serving in Iraq and Afghanistan have been exposed to the possibility of fire-related injuries. The Ike Skelton National Defense Authorization Act for Fiscal Year 2011 extended to 2015 the authority to procure fire resistant rayon fiber for the production of uniforms from certain foreign countries, provided by section 829 of the National Defense Authorization Act for Fiscal Year 2008 and originally set to expire in 2013. This letter discusses the briefing developed in response to the requirement in the Ike Skelton National Defense Authorization Act for Fiscal Year 2011 to report on the supply chain for FR fiber for the production of military uniforms. Specifically, the act required GAO to analyze several elements of the supply chain, including the current and anticipated sources of FR rayon fiber; actions DOD has taken to identify alternatives to FR rayon fiber; impediments to the use of such alternatives; and the ...
Contributing Partner: UNT Libraries Government Documents Department
Identification and quantification of lipid metabolites in cotton fibers: Reconciliation with metabolic pathway predictions from DNA databases.

Identification and quantification of lipid metabolites in cotton fibers: Reconciliation with metabolic pathway predictions from DNA databases.

Date: May 2004
Creator: Wanjie, Sylvia W.
Description: The lipid composition of cotton (Gossypium hirsutum, L) fibers was determined. Fatty acid profiles revealed that linolenate and palmitate were the most abundant fatty acids present in fiber cells. Phosphatidylcholine was the predominant lipid class in fiber cells, while phosphatidylethanolamine, phosphatidylinositol and digalactosyldiacylglycerol were also prevalent. An unusually high amount of phosphatidic acid was observed in frozen cotton fibers. Phospholipase D activity assays revealed that this enzyme readily hydrolyzed radioactive phosphatidylcholine into phosphatidic acid. A profile of expressed sequence tags (ESTs) for genes involved in lipid metabolism in cotton fibers was also obtained. This EST profile along with our lipid metabolite data was used to predict lipid metabolic pathways in cotton fiber cells.
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Tests on built-up airplane struts having initial tension in outside fibers

Tests on built-up airplane struts having initial tension in outside fibers

Date: August 1, 1923
Creator: Schwamb, T A & Smith, C S
Description: The conventional airplane strut fails by buckling. The first signs of failure usually are compression cracks on the concave side of bending. It would therefore appear that if an initial tension could be introduced in the outside fibers, this tension would have to be relieved before the compression load could make itself felt.
Contributing Partner: UNT Libraries Government Documents Department
Roselle: Its Culture and Uses

Roselle: Its Culture and Uses

Date: 1907
Creator: Wester, P. J. (Peter Johnson), 1877-1931
Description: Report discussing and promoting the cultivation of the roselle plant -- a species of hibiscus -- in the United States. Topics discussed include varieties of roselle, helpful fertilizers, harvesting practices, uses, and common diseases and insect enemies.
Contributing Partner: UNT Libraries Government Documents Department
Hemp as an Agricultural Commodity

Hemp as an Agricultural Commodity

Date: January 5, 2005
Creator: Rawson, Jean M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Hemp as an Agricultural Commodity

Hemp as an Agricultural Commodity

Date: July 8, 2005
Creator: Rawson, Jean M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Hemp as an Agricultural Commodity

Hemp as an Agricultural Commodity

Date: March 21, 2013
Creator: Johnson, Renée
Description: This report discusses the various industrial uses for Hemp, a variety of Cannabis sativa and is of the same plant species as marijuana. The report compares Hemp with Marijuana and discusses global production, legal status, and recent legislative activity.
Contributing Partner: UNT Libraries Government Documents Department
Pretreatment Optimization of Fiberglass Manufacturing Industrial Wastewater

Pretreatment Optimization of Fiberglass Manufacturing Industrial Wastewater

Date: December 1998
Creator: Dragoo, Ron
Description: Wastewater effluent produced in the fiberglass manufacturing industry contains a significant amount of total suspended solids. Environmental regulations require pretreatment of effluent before it is discharged to the municipal wastewater treatment plant. Chemical precipitation by coagulation and flocculation is the method of pretreatment used at the Vetrotex CertainTeed Corporation (VCT). A treatability study was conducted to determine conditions at which the VCT Wastewater Pretreatment Plant could operate to consistently achieve a total suspended solids concentration ≤ 200-mg/L. Jar tests varied pH, polymer dosage, and ferric sulfate dosage. Total suspended solids and turbidity were measured to evaluate treatment performance. The data were used to determine an optimum set of conditions under project guidelines. Of twelve polymers screened, BPL 594 was selected as the most effective polymer. For cost efficiency in the wastewater pretreatment operation, recommendations suggested that treatment chemical injection be electronically controlled according to turbidity of the treated effluent.
Contributing Partner: UNT Libraries
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