Immonen Kirsi, Lahtinen Panu, Pere Jaakko
Biocomposites and Processing, VTT Technical Research Centre of Finland, Tampere 33101, Finland.
Biomass Processing Technologies, VTT Technical Research Centre of Finland, Espoo 02150, Finland.
Bioengineering (Basel). 2017 Nov 17;4(4):91. doi: 10.3390/bioengineering4040091.
Thermoplastic composite materials containing wood fibers are gaining increasing interest in the manufacturing industry. One approach is to use nano- or micro-size cellulosic fibrils as additives and to improve the mechanical properties obtainable with only small fibril loadings by exploiting the high aspect ratio and surface area of nanocellulose. In this study, we used four different wood cellulose-based materials in a thermoplastic polylactide (PLA) matrix: cellulose nanofibrils produced from softwood kraft pulp (CNF) and dissolving pulp (CNFSD), enzymatically prepared high-consistency nanocellulose (HefCel) and microcellulose (MC) together with long alkyl chain dispersion-improving agents. We observed increased impact strength with HefCel and MC addition of 5% and increased tensile strength with CNF addition of 3%. The addition of a reactive dispersion agent, epoxy-modified linseed oil, was found to be favorable in combination with HefCel and MC.
含有木纤维的热塑性复合材料在制造业中越来越受到关注。一种方法是使用纳米或微米尺寸的纤维素原纤维作为添加剂，并通过利用纳米纤维素的高长径比和表面积，仅用少量的原纤维负载量来提高可获得的机械性能。在本研究中，我们在热塑性聚乳酸（PLA）基体中使用了四种不同的木质纤维素基材料：由软木硫酸盐浆（CNF）和溶解浆（CNFSD）制备的纤维素纳米原纤维、酶法制备的高浓度纳米纤维素（HefCel）和微纤维素（MC），以及长烷基链分散改进剂。我们观察到，添加5%的HefCel和MC可提高冲击强度，添加3%的CNF可提高拉伸强度。已发现，添加反应性分散剂环氧改性亚麻籽油与HefCel和MC组合是有利的。
