Original scientific paper

https://doi.org/10.5552/drvind.2022.2104

Long-Term Hygroscopic Thickness Swelling Rate of Hydrothermally Treated Beech Wood / Polypropylene Composites

Seyyed Khalil Hosseinihashemi orcid.org/0000-0001-6236-0376 ; Department of Wood Science and Paper Technology, Karaj Branch, Islamic Azad University, Karaj, Iran
Farhad Arwinfar ; Department of Wood Science and Paper Technology, Karaj Branch, Islamic Azad University, Karaj, Iran
Abdollah Najafi ; Department of Wood Science and Paper Technology, Chalous Branch, Islamic Azad University, Chalous, Iran
Ferhat Özdemir ; Department of Wood Chemistry and Technology, Forestry Faculty, Kahramanmaraş Sütçü İmam University, Oniki Şubat, 46050, Kahramanmaraş, Turkey
Nadir Ayrilmis orcid.org/0000-0001-9837-899X ; Department of Wood Mechanics and Technology, Forestry Faculty, Istanbul University-Cerrahpasa, Bahcekoy, Sariyer, 34473 Istanbul, Turkey
Abbas Tamjidi orcid.org/0000-0002-0469-2433 ; Department of Wood Science and Paper Technology, Karaj Branch, Islamic Azad University, Karaj, Iran

Abstract

Long-term hygroscopic thickness swelling rate of polypropylene (PP) composites filled with thermally treated wood flour was investigated. The beech wood chips were heat treated at 120 °C, 150 °C or 180 °C for 30 or 120 min using saturated steam in a digester. The composites based on PP, beech wood flour (BF), and coupling agents (PP-g-MA) were made by melt compounding and injection molding. The weight ratio of BF to PP was controlled at 50/47 for all blends. The amount of coupling agent was fixed at 3 wt.% for all formulations. Further study was conducted to model thickness swelling of the composites, a swelling rate parameter (KSR). The thickness swelling of thermally-treated samples at 120 ºC for 30 min and at 150 ºC for 30 min were lower than that of control samples, followed by thermally-treated samples at 180 ºC for 120 min, at 180 ºC for 30 min, at 120 ºC for 120 min, and at 150 ºC for 120 min, respectively. Furthermore, the thickness swelling of the BF/PP composites decreased with increasing time and temperature of the thermal-treatment. In addition, at 120 ºC for 30 min, the composites showed a lower swelling rate than control samples. The KSR of the composites was influenced both by the time and temperature of thermal treatment.

Keywords

thickness swelling rate; thermal-treatment; lignocellolusic filler; polypropylene

Hrčak ID:

274114

URI

https://hrcak.srce.hr/274114

Publication date:

19.3.2022.

Article data in other languages: croatian

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