Enhanced interlayer interaction in cellulose single nanofibre and poly(l-lactic acid) layered films by plasma-initiated surface grafting of poly(acrylic acid) onto poly(l-lactic acid) films |
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| Authors: | Weihua Kai Kazuki Akamatsu Akira Isogai |
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| Institution: | a Graduate school of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoyi, Bunkyo-ku Tokyo 113-8657, Japan
b Graduate school of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656, Japan |
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| Abstract: | The surface of a poly(l-lactic acid) (PLLA) film was modified with poly(acrylic acid) (PAA) by plasma-initiated polymerization to increase the interaction between PLLA and cellulose single nanofibres (CSNF). The surface wettability of the PAA grafted PLLA film (PLLA-PAA film) was investigated by contact angle measurements. Modification of the PLLA film with PAA decreased the contact angle from 61° to 50°. The surface morphologies of the PLLA film, PLLA-PAA film and CSNF-coated PLLA-PAA film were studied by atomic force microscopy. The interaction between the CSNF and PLLA layers was strengthened by incorporation of a PAA layer onto the PLLA films and it is higher than 2N as proved by a peeling test. This is probably because the carboxyl groups of PAA form hydrogen bonds with the hydroxyl groups of CSNF. |
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| Keywords: | l-lactic acid)" target="_blank">Poly(l-lactic acid) Cellulose single nanofiber Surface modification Plasma-initiated polymerization Interlayer interaction |
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