Adhesion properties of regenerated lignocellulosic fibres towards poly (lactic acid) microspheres assessed by colloidal probe technique

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:532

Article

Colson, Jerome¹  Pettersson, Torbjorn²  Asaadi, Shirin³  Sixta, Herbert³  Nypelo, Tiina⁴  Mautner, Andreas⁵  Konnerth, Johannes¹ 

[1] Univ Nat Resources & Life Sci Vienna, Dept Mat Sci & Proc Engn, Inst Wood Technol & Renewable Mat, Konrad Lorenz Str 24, A-3430 Tulin, Austria

[2] KTH Royal Inst Technol, Dept Fibre & Polymer Technol, Div Fibre Technol, Tekn Ringen 58, S-10044 Stockholm, Sweden

[3] Aalto Univ, Sch Chem Engn, Dept Bioprod & Biosyst, Vuorimiehentie 1, Espoo 02150, Finland

[4] Chalmers Univ Technol, Dept Chem & Chem Technol, Kemigarden 4, S-41296 Gothenburg, Sweden

[5] Univ Vienna, Fac Chem, Inst Mat Chem & Res, Wahringer Str 42, A-1090 Vienna, Austria

关键词: Colloidal probe;    Interface;    Lignin;    Cellulose;    Hemicellulose;    Polymers;    Microspheres;    Inverse gas chromatography;   

DOI  :  10.1016/j.jcis.2018.08.032

来源: Elsevier

【 摘 要 】

In the field of polymer reinforcement, it is important to understand the interactions involved between the polymer matrix and the reinforcing component. This paper is a contribution to the fundamental understanding of the adhesion mechanisms involved in natural fibre reinforced composites. We report on the use of the colloidal probe technique for the assessment of the adhesion behaviour between poly(lactic acid) microspheres and embedded cross-sections of regenerated lignocellulosic fibres. These fibres consisted of tailored mixtures of cellulose, lignin and xylan, the amount of which was determined beforehand. The influence of the chemical composition of the fibres on the adhesion behaviour was studied in ambient air and in dry atmosphere. In ambient air, capillary forces resulted in larger adhesion between the sphere and the fibres. Changing the ambient medium to a dry nitrogen atmosphere allowed reducing the capillary forces, leading to a drop in the adhesion forces. Differences between fibres of distinct chemical compositions could be measured only on freshly cut surfaces. Moreover, the surface energy of the fibres was assessed by inverse gas chromatography. Compared to fibres containing solely cellulose, the presence of lignin and/or hemicellulose led to higher adhesion and lower surface energy, suggesting that these chemicals could serve as natural coupling agents between hydrophobic and hydrophilic components. (C) 2018 Published by Elsevier Inc.

【 授权许可】

Free