Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 136, Issue 37, Pages -Publisher
WILEY
DOI: 10.1002/app.47955
Keywords
adhesion; biocomposite; poly(lactic acid); pulp fibers; wood-based fibers
Categories
Funding
- CLIC Innovation Ltd New Fiber Products Project
- Academy of Finland's Flagship Programme [318890, 318891]
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This article focuses on the effect of pulp bleaching and emerging commercial compatibilizers on physical performance of pulp fiber reinforced poly(lactic acid) (PLA) biocomposites. Industrially bleached and unbleached hardwood kraft pulp fibers are treated with several additive types, and compounded with PLA to fiber content of 30 wt %. After injection molding, the produced biocomposites are evaluated by their mechanical performance and fiber-matrix adhesion. For selected materials, fiber surface and fiber properties are reflected to composite performance by analyzing the compositions, dimensions, and lignin coverage of original fibers, as well as fiber dispersion and dimensions after melt processing. As a conclusion, unbleached kraft pulp fibers provide significant improvement in physical properties of PLA/pulp fiber composites. Of the screened compatibilizers, epoxidated linseed oil has a clear positive effect on performance when bleached kraft pulp fibers are used. The improvements correspond to enhanced fiber-matrix adhesion and differences in remaining fiber length distributions. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47955.
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