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  • Analysis and comparison of essential oil components extracted from the heartwoods of Leyland cypress, Alaska yellow cedar, and Monterey cypress

    Creator:
    Liu, Xinfeng
    Abstract:
    The essential oil components of cedar heartwoods play an important role in the durability of these trees. Yet, the composition of these oils and identity of many of the compounds remains unknown, or incompletely know for some commercially important cedar heartwoods. The essential oil extracts of Alaska Yellow Cedar (Chamaecyparis...
    Resource Type:
    Masters Thesis
    Full Text:
    Monterey Cypress. Abstract approved: ___________________________ Joseph J. Karchesy

  • Natural and semi-synthetic compounds with biocidal activity against arthropods of public health importance

    Creator:
    Khasawneh, Mohammad A.
    Abstract:
    This study identified new compounds with pest control activities. The two sources of candidates that were followed here were the main heartwood extract of Alaska Yellow Cedar (AYC) constituents and several semi-synthetic counterparts. Five compounds were isolated and identified for the first time in AYC heartwood in this research: two...
    Resource Type:
    Dissertation
    Full Text:
    The author would like to express sincere appreciation to Prof. Joe J. Karchesy for his help, guidance

  • Poly(vinyl alcohol) / cellulose nanocomposite barrier films

    Creator:
    Paralikar, Shweta
    Abstract:
    There is a continual interest in developing robust, flexible, durable, lightweight, waterborne polymer barrier coatings which are increasingly resistant towards both chemical warfare agents as well as an ever growing number of toxic industrial chemicals. In this study, barrier films were prepared with poly(vinyl alcohol) (PVOH) and varying amounts of...
    Resource Type:
    Masters Thesis
    Full Text:
    . Joe Karchesy, Dr. Christine Kelly and Dr. David Cann for agreeing to serve on my committee and for

  • Development and evaluation of a new formaldehyde-free wood adhesive from renewable materials for making interior plywood

    Creator:
    Jang, Yonghwan
    Abstract:
    Synthetic adhesives, such as phenol-formaldehyde (PF) resins and urea-formaldehyde (UF) resins, have dominated the wood adhesive market since they were introduced in the wood products industry. Formaldehyde, as a key component in the manufacturing of PF and UF resins, has been classified as a known human carcinogen by the International...
    Resource Type:
    Masters Thesis
    Full Text:
    revising my thesis. I would like to sincerely thank Dr. Willie E. Skip Rochefort, Dr. Joe Karchesy, and

  • Improved interfacial adhesion in wood-plastic composites : Development of new compatibilizers

    Creator:
    Zhang, Cheng
    Abstract:
    In wood-plastic composites (WPCs) a compatibilizer is often used to improve the interfacial adhesion between the hydrophilic wood filler and the hydrophobic plastic matrix. At present, while the basic concepts of compatibilization are understood, the optimized chemical structures of an effective compatibilizer, including the ideal structures of the wood-binding domain...
    Resource Type:
    Dissertation
    Full Text:
    , Joe Karchesy and Dr. Skip Rochefort. I am grateful to my fellow graduate students and group members

  • New application of crystalline cellulose in rubber composites

    Creator:
    Bai, Wen
    Abstract:
    Rubber without reinforcement has limited applications. The strength of reinforced rubber composites can be ten times stronger than that of unreinforced rubbers. Therefore, rubber composites are widely used in various applications ranging from automobile tires to seals, valves, and gaskets because of their excellent mechanical elastic properties. Silica and carbon...
    Resource Type:
    Dissertation
    Full Text:
    . I would also like to extend my appreciation to my committee members, Dr. Everett Hansen, Dr, Joe

  • Cellulose reinforced high density polyethylene

    Creator:
    Palaniyandi, Velmurugan
    Abstract:
    High density polyethylene (HDPE) is a ubiquitous material with versatile properties. It is produced and used in greater volume than any other thermoplastic. HDPE is often filled with a variety of materials for various applications. Glass fiber and wood flour are two common fillers for HDPE. Recently there has been...
    Resource Type:
    Masters Thesis

  • Reactive polyphenols and dissolved nutrients in a nitrogen-limited headwater catchment, western Cascades, Oregon, USA

    Creator:
    Rasmussen, Janet K.
    Abstract:
    In undisturbed N-limited forested catchments, DON may represent over 90% of the total N lost in streams. Some ecologists have suggested that plant-derived reactive polyphenols may be responsible for DON binding and transport because polyphenol-protein complexes are known to precipitate out of solution, bind to mineral surfaces or organic matter...
    Resource Type:
    Masters Thesis
    Full Text:
    . Joe Karchesy was always available for questions and supported my sometimes unconventional approaches

  • Investigation of new compatibilizer systems for wood-polyethylene composites

    Creator:
    Geng, Yu
    Abstract:
    Wood-plastic composites (WPCs) are one of the fastest-growing sectors of the wood composites industry. However, the strengths of WPCs are typically low because of the poor interfacial adhesion between hydrophilic wood and hydrophobic thermoplastics. A compatibilizer that can form bridges between wood and plastics is required to give WPCs desirable...
    Resource Type:
    Dissertation
    Full Text:
    , and my committee members, Dr. Joe Karchesy, Dr. Skip Rochefort, Dr. Mark Zabriskie, for their advice

  • Development and evaluation of novel coupling agents for kenaf-fiber-reinforced unsaturated polyester composites

    Creator:
    Ren, Xiaofeng
    Abstract:
    Natural fibers are gaining popularity as reinforcement materials for thermoset resins over the last two decades. Natural fibers are inexpensive, abundant, renewable and environmentally friendly. Kenaf fibers are one of the natural fibers that can potentially be used for reinforcing unsaturated polyester (UPE). As a polymer matrix, UPE enjoys a...
    Resource Type:
    Dissertation
    Full Text:
    for my whole lifetime. I would like to thank Dr. Joseph Karchesy, Dr. John Nairn, Dr. Willie E. Skip