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Abstract
Commercial adhesives present a high bond strength and water resistance, but they are considered non-healthier products. Chitosan can be considered as an interesting biosourced and biodegradable alternative, despite its low water resistance. Here, its wood bonding implementation and its tensile shear strength in dry and wet conditions were investigated depending on its structural characteristics. Firstly, the spread rate, open assembly time, drying pressure, drying temperature, and drying time have been determined for two chitosans of European pine double lap specimens. An adhesive solution spread rate of 1000 g·m−2, an open assembly time of 10 min, and a pressure temperature of 55 °C for 105 min led to a bond strength of 2.82 MPa. Secondly, a comparison between a high molecular weight/low deacetylation degree chitosan and a lower molecular weight/higher deacetylation degree chitosan was conducted. Tests were conducted with beech simple lap specimens in accordance with the implementation conditions and the conditioning treatments in wet and dry environments required for thermoplastic wood adhesive standards used in non-structural applications (EN 204 and EN 205). The results clearly revealed the dependence of adhesive properties and water resistance on the structural features of chitosans (molecular weight and deacetylation degree), explaining the heterogeneity of results published notably in this field.
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Aljawish A, Chevalot I, Jasniewski J, Scher J, Muniglia L. Enzymatic synthesis of chitosan derivatives and their potential applications. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcatb.2014.10.014] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Yamada K, Naohara Y. Adhesion of grafted polypropylene plates with enzymatically modified chitosan solutions and analysis of failed surfaces by X-ray photoelectron spectroscopy. J Appl Polym Sci 2013. [DOI: 10.1002/app.39301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kazunori Yamada
- Department of Applied Molecular Chemistry; College of Industrial Technology; Nihon University, 1-2-1 Izumi-cho; Narashino, Chiba 275-8575 Japan
| | - Yuki Naohara
- Department of Applied Molecular Chemistry; College of Industrial Technology; Nihon University, 1-2-1 Izumi-cho; Narashino, Chiba 275-8575 Japan
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Popelka A, Novák I, Lehocký M, Junkar I, Mozetič M, Kleinová A, Janigová I, Šlouf M, Bílek F, Chodák I. A new route for chitosan immobilization onto polyethylene surface. Carbohydr Polym 2012; 90:1501-8. [DOI: 10.1016/j.carbpol.2012.07.021] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 07/03/2012] [Accepted: 07/07/2012] [Indexed: 10/28/2022]
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Yamada K, Yamagami S, Naohara Y. Estimation of surface properties of grafted layers formed on low- and high-density polyethylene plates by photografting of methacrylic acid and acrylic acid at different monomer concentrations and temperatures. J Appl Polym Sci 2012. [DOI: 10.1002/app.36399] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Adhesion of polyethylene plates photografted with methacrylic acid and acrylic acid with enzymatically modified chitosan solutions and X-ray photoelectron spectroscopy analysis of failed surfaces. J Appl Polym Sci 2011. [DOI: 10.1002/app.33634] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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