Item – Theses Canada

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OCLC number
54775039
Author
Wang, Hui,1965-
Title
Response of a PVC lignin blended building material to fungi attack.
Degree
M.A. Sc. -- Concordia University, 2002
Publisher
Ottawa : National Library of Canada = Bibliothèque nationale du Canada, [2003]
Description
2 microfiches.
Notes
Includes bibliographical references.
Abstract
Poly vinyl chloride (PVC) products are susceptible to biological attack. To study this problem, lignin was considered as a material in blend with PVC. Lignin is a renewable, naturally occurring compound and is obtained as a by-product of pulping processes. At present, extensive research has been performed to explore the utilization of lignin. This research studies the feasibility of partially replacing a copolymer of vinyl chloride-vinyl acetate (VC-VAc) by lignin in flooring formulations and evaluates the effects of lignin on the resistance of these formulations to fungi attack. The lignin utilized in the study was an organosolv lignin-Alcell lignin. To accomplish the objectives, a series of PVC controls and PVC-lignin blends with various plasticizers were inoculated with fungi. After a 28-day incubation, the changes in chemical structure were analyzed by Fourie Transform Infrared (ATR/FTIR) spectroscopy. Optical stereomicroscopy and optical microscopy were employed to observe the changes at the surface. This research is the original assessment of the resistances of PVC-lignin blends to biodegradation. After a series of experiments, it was found that all fungi species grew on every composite and showed similar abilities of growth. PVC and PVC-lignin blends are susceptive to fungi attack and plasticizers are the main targets of fungi attack; the susceptibility of the plasticizers to biodegradation in descendent order is: 'Di-ethylene glycol di-benzoate ' ('Benzoflex 2-45') > 'Alchil sulphonate' ('Mesamoll') > 'Di-octyl phthalate' (' DOP') > 'Tricresyl phospate' ('Lindol'). Lindol is the most suitable plasticizer for the formulation of PVC-lignin flooring; Alcell lignin is biodegradable; the presence of Alcell lignin in the complex interactive system PVC-lignin-additives increases the biodegradability of polymeric materials.
ISBN
0612729044
9780612729049