Investigating the bending creep behavior of poplar wood plastic plywood manufactured by thermoplastic films

Document Type : Research Paper

Authors

1 Assistance at Department of wood science and paper technology, Calous branch, Islamic Azad University, Calous, Iran.

2 Associate Professor. wood and paper science and technology, Islamic Azad University, Chalous, Iran

10.22034/ijwp.2023.555110.1552

Abstract

In this study, bending creep behavior of poplar (Populus alba) plywood made by thermoplastic films was evaluated. For this purpose, the poplar wood layers (2.2 mm thickness) were prepared and the plywood samples were made using high density polyethylene (HDPE) film, polypropylene (PP) film, the mixed high-density polyethylene-polypropylene (PP/HDPE) films and, urea formaldehyde (UF) glue, as a binder, in 5 replications. The maleic anhydride grafted high-density polyethylene (MAPE) was used as a coupling agent. The three-point bending test was performed, and the maximum failure load, modulus of elasticity (MOE) and modulus of rupture (MOR) were measured according to EN-310. Then 20% of the maximum failure load of the samples was determined. To measure the creep parameter, the four-point bending creep test was performed based on 60 minutes of loading time (going) and 30 minutes of unloading time (returning). The results indicated that the plywood made of urea formaldehyde glue and also mixed polypropylene-polyethylene film had highest MOE and MOR and the samples made of polyethylene film had the lowest values of MOE and MOR. The results of the creep test indicated that the highest value of the creep modulus and the lowest value of relative creep were observed in the plywood made with urea formaldehyde glue. The boards made with polyethylene film showed the highest relative creep due to the decrease in modulus of elasticity and bending strength. The use of polypropylene film and the mixed high-density polyethylene- polypropylene (PP/HDPE), both showed an increase in the creep modulus due to the stiffness of polypropylene. The coupling agent caused a better transfer of stress and showed an increase in creep modulus and a decrease in relative creep by improving the level of sharing between the base material and the film.

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Main Subjects

References

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Iranian Journal of Wood and Paper Industries
Volume 13, Issue 4
March 2023
Pages 393-403

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