Long-Term Creep Compliance of Wood Polymer Composites: Using Untreated Wood Fibers as a Filler in Recycled and Neat Polypropylene Matrix

Bek, Marko; Aulova, Alexandra; Črešnar, Klementina Pušnik; Matkovič, S.; Kalin, Mitjan; Perše, Lidija Slemenik

doi:10.3390/polym14132539

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…The filler/matrix adhesion depends on the compatibility between the filler and the matrix. Bek et al [4] compared the long-term creep compliances of neat and recycled polypropylene (PP) reinforced with untreated wood fibers. They found a superior creep resistance for neat PP composites and attributed it to a higher crystallinity and better interfacial adhesion due to trans-crystalline structures around the wood fibers occurring only for neat PP.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Creep Behavior of Particulate Composites with Focus on Interfacial Adhesion Effect

Rech

Dorp

Möginger

et al. 2022

IJMS

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Evaluation of creep compliance of particulate composites using empirical models always provides parameters depending on initial stress and material composition. The effort spent to connect model parameters with physical properties has not resulted in success yet. Further, during the creep, delamination between matrix and filler may occur depending on time and initial stress, reducing an interface adhesion and load transfer to filler particles. In this paper, the creep compliance curves of glass beads reinforced poly(butylene terephthalate) composites were fitted with Burgers and Findley models providing different sets of time-dependent model parameters for each initial stress. Despite the finding that the Findley model performs well in a primary creep, the Burgers model is more suitable if secondary creep comes into play; they allow only for a qualitative prediction of creep behavior because the interface adhesion and its time dependency is an implicit, hidden parameter. As Young’s modulus is a parameter of these models (and the majority of other creep models), it was selected to be introduced as a filler content-dependent parameter with the help of the cube in cube elementary volume approach of Paul. The analysis led to the time-dependent creep compliance that depends only on the time-dependent creep of the matrix and the normalized particle distance (or the filler volume content), and it allowed accounting for the adhesion effect. Comparison with the experimental data confirmed that the elementary volume-based creep compliance function can be used to predict the realistic creep behavior of particulate composites.

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Section: Introductionmentioning

confidence: 99%