Sorption properties of wood impregnated with aqueous solution of boric acid and montan wax emulsion

Author

Boštjan Lesar 

 

Aleš Straže 

 

Miha Humar

Boštjan Lesar  Aleš Straže  Miha Humar

First published: 23 November 2010 https://doi.org/10.1002/app.33196 Cited by: 8

First published: 23 November 2010

 

https://doi.org/10.1002/app.33196

 

Cited by:8

Abstract

Nonbiocidal techniques for wood protection have become more and more important in the last few years. One of the possible treatments to enhance wood durability is use of water repellents. In this research, the influence of one of the possible water repellents, the montan wax emulsion, on the moisturizing and the sorption characteristics of impregnated wood was investigated. To achieve a better protection against wood decay fungi, wood was impregnated with montan wax emulsion enriched with boric acid. The equilibrium moisture content (MC) was monitored during the adsorption and the desorption processes at five levels of relative air humidity (RH1 = 20%, RH2 = 33%, RH3 = 65%, RH4 = 88%, and RH5 = 98%). Water repellence efficiency was monitored in the chamber with high RH (87%) and during dipping in the water. Impregnated samples were also exposed outdoors in a covered position for 5 months to determine MC changes according to changes in outdoor humidity and temperature. The results showed that the sorption properties of the impregnated wood are strongly related to retention of preservative solutions after impregnation and its composition. Montan wax reduced equilibrium MC of the impregnated wood up to 25% (relatively), whereas specimens impregnated with combination of montan wax and boric acid resulted in decreased MC in some cases and in increased MC in some cases. The Guggenheim–Andersen–deBoer model of sorption isotherms was fitted to experimental data to explain the sorption mechanisms. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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The composite wood by poplar wood impregnated with Na2SiO3-polyacrylamide hybrid solution

Author

Hongxia Guo

 / Chunli Xu

 / Lanying Lin

 / Qun Wang

 / Feng Fu

Published Online: 2011-09-07 | DOI: https://doi.org/10.1515/secm.2011.025

Abstract

The Na2SiO3-polyacrylamide (PAM) inorganic/organic homo­geneous hybrid was prepared by polymerization of acrylamide monomer in the presence of a water-glass solution. Then, the hybrid was introduced into pores of poplar wood by impregnation treatment, and composite wood was produced. The structure of the controlled and treated wood specimen was investigated by scanning electrode microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The thermal stability of the composite wood was evaluated by thermogravimetric (TG) and oxygen index. The results showed that the treated wood showed a lower weight loss and higher oxygen index when weight percent gains (WPG) of the composite wood reached 31.6%. Also, the composite wood showed improved bending strength, modulus of elasticity in static bending, and hardness, when compared with controlled samples.

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Published Online: 2011-09-07

Published in Print: 2011-09-01

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Citation Information: Science and Engineering of Composite Materials, Volume 18, Issue 3, Pages 151–155, ISSN (Online) 2191-0359, ISSN (Print) 0792-1233, DOI: https://doi.org/10.1515/secm.2011.025.

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https://www.degruyter.com/view/j/secm.2011.18.issue-3/secm.2011.025/secm.2011.025.xml

Comparative in situ biodegradation studies of polyhydroxybutyrate film composites

Author

• Prasenjit Debbarma
  • 1
• Shikha Raghuwanshi
  • 1
• Jyoti Singh
  • 1
• Deep Chandra Suyal
  • 1
• M. G. H. Zaidi
  • 2
• Reeta Goel
  • 1
  Email authorView author's OrcID profile

1. 1.Department of Microbiology, College of Basic Sciences and HumanitiesG. B. Pant University of Agriculture and TechnologyPantnagarIndia
2. 2.Department of Chemistry, College of Basic Sciences and HumanitiesG. B. Pant University of Agriculture and TechnologyPantnagarIndia

Original Article

First Online: 29 June 2017

Abstract

Application of polyhydroxybutyrate (PHB) to plastic industry has expanded over the last decades due to its attracting features over petro-based plastic, and therefore, its waste accumulation in nature is inevitable. In the present study, a total of four bacterial strains, viz., MK3, PN12, PW1, and Lna3, were formulated into a consortium and subsequently used as biological tool for degradation of biopolymers. The consortium was tested through λ max shifts under in vitro conditions for utilization of PHB as sole carbon source. Talc-based bioformulations of consortium were used for the degradation of PHB film composites under in situ conditions. After 9 months of incubation, the recovered samples were monitored through Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM), respectively. Analytical data, viz., changes in λ max shifts (212–219 nm), FT-IR spectra, and SEM micrographs, revealed the biodegradation potential of developed consortium against PHB film composites, i.e., higher degradation of copolymer films was found over blend films. The used consortium had enhanced the rate of natural degradation and can be further used as a natural tool to maintain and restore global environmental safety.

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