NDLI: Enhancing the wet strength of lignocellulosic fibrous networks using photo-crosslinkable polymers

Content Provider	Springer Nature Link
Author	Jocher, Michael Gattermayer, Melanie Kleebe, Hans Joachim Kleemann, Stephan Biesalski, Markus
Copyright Year	2014
Abstract	Wet strengthening of paper products is typically performed by thermo-crosslinking reactive polymers or polymer precursors. In this article we introduce a novel concept for generating wet-strength paper grades by using photoreactive polymers and light as the energy source. Statistical, hydrophilic copolymers of dimethylacrylamide and benzophenone-methacrylate monomer, respectively, were synthesised and surface-applied to model paper handsheets. Benzophenone, as a photoreactive group, was selected because of its high crosslinking efficiency when illuminated with UV light (365 or 254 nm). After photo-crosslinking of the polymer-modified handsheets, first results of mechanical testing showed a significant increase of the wet tensile strength. The wet strength is a function of the molar content of the photoreactive group (benzophenone) within the polymer, the mass of the polymer relative to the dry fibre, the wavelength of irradiation and the intensity of UV exposure. Hence, there are a number of options to control and modulate the wet strength of paper sheets between less than 2 % (relative to the dry strength of the paper sheet) up to more than 15 %. In comparison to commercially available wet strength additives, crosslinking can be achieved even in the presence of humidity (up to 10 % water in the handsheet by weight) and at room temperature.
Starting Page	581
Ending Page	591
Page Count	11
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	22
Issue Number	1
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-10-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wet tensile strength Photoreactive polymer Benzophenone Wet-strength additive Cellulose fibres Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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