Rigid Polyurethane Foams Based on BioPolyol and Additionally Reinforced with Silanized and Acetylated Walnut Shells for the Synthesis of Environmentally Friendly Insulating Materials

Rigid polyurethane (PUR) foams produced from walnut shellsderived polyol (20 wt.%) were successfully reinforced with 2 wt.% of nontreated, acetylated, and silanized walnut shells (WS). The impact of nontreated and chemicallytreated WS on the morphology, mechanical, and thermal characteristics of PUR...

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Main Authors: Sylwia Członka, Anna Strąkowska
Format: Article
Language:English
Published: MDPI AG 2020-07-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/13/15/3245
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spelling doaj-8b56e0d7f9e74fa0868bf5d9315243882020-11-25T03:29:35ZengMDPI AGMaterials1996-19442020-07-01133245324510.3390/ma13153245Rigid Polyurethane Foams Based on BioPolyol and Additionally Reinforced with Silanized and Acetylated Walnut Shells for the Synthesis of Environmentally Friendly Insulating MaterialsSylwia Członka0Anna Strąkowska1Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Stefanowskiego 12/16, 90924 Lodz, PolandInstitute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Stefanowskiego 12/16, 90924 Lodz, PolandRigid polyurethane (PUR) foams produced from walnut shellsderived polyol (20 wt.%) were successfully reinforced with 2 wt.% of nontreated, acetylated, and silanized walnut shells (WS). The impact of nontreated and chemicallytreated WS on the morphology, mechanical, and thermal characteristics of PUR composites was determined. The morphological analysis confirmed that the addition of WS fillers promoted a reduction in cell size, compared to pure PUR foams. Among all the modified PUR foams, the greatest improvement of mechanical characteristics was observed for PUR foams with the addition of silanized WS—the compressive, flexural, and impact strength were enhanced by 21, 16, and 13%, respectively. The addition of nontreated and chemicallytreated WS improved the thermomechanical stability of PUR foams. The results of the dynamic mechanical analysis confirmed an increase in glass transition temperature and storage modulus of PUR foams after the incorporation of chemicallytreated WS. The addition of nontreated and chemicallytreated WS did not affect the insulating properties of PUR foams, and the thermal conductivity value did not show any significant improvement and deterioration due to the addition of WS fillers.https://www.mdpi.com/1996-1944/13/15/3245rigid polyurethane foamslignocellulosic materialsfillerchemical treatmentmechanical characteristics
collection DOAJ
language English
format Article
sources DOAJ
author Sylwia Członka
Anna Strąkowska
spellingShingle Sylwia Członka
Anna Strąkowska
Rigid Polyurethane Foams Based on BioPolyol and Additionally Reinforced with Silanized and Acetylated Walnut Shells for the Synthesis of Environmentally Friendly Insulating Materials
Materials
rigid polyurethane foams
lignocellulosic materials
filler
chemical treatment
mechanical characteristics
author_facet Sylwia Członka
Anna Strąkowska
author_sort Sylwia Członka
title Rigid Polyurethane Foams Based on BioPolyol and Additionally Reinforced with Silanized and Acetylated Walnut Shells for the Synthesis of Environmentally Friendly Insulating Materials
title_short Rigid Polyurethane Foams Based on BioPolyol and Additionally Reinforced with Silanized and Acetylated Walnut Shells for the Synthesis of Environmentally Friendly Insulating Materials
title_full Rigid Polyurethane Foams Based on BioPolyol and Additionally Reinforced with Silanized and Acetylated Walnut Shells for the Synthesis of Environmentally Friendly Insulating Materials
title_fullStr Rigid Polyurethane Foams Based on BioPolyol and Additionally Reinforced with Silanized and Acetylated Walnut Shells for the Synthesis of Environmentally Friendly Insulating Materials
title_full_unstemmed Rigid Polyurethane Foams Based on BioPolyol and Additionally Reinforced with Silanized and Acetylated Walnut Shells for the Synthesis of Environmentally Friendly Insulating Materials
title_sort rigid polyurethane foams based on biopolyol and additionally reinforced with silanized and acetylated walnut shells for the synthesis of environmentally friendly insulating materials
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2020-07-01
description Rigid polyurethane (PUR) foams produced from walnut shellsderived polyol (20 wt.%) were successfully reinforced with 2 wt.% of nontreated, acetylated, and silanized walnut shells (WS). The impact of nontreated and chemicallytreated WS on the morphology, mechanical, and thermal characteristics of PUR composites was determined. The morphological analysis confirmed that the addition of WS fillers promoted a reduction in cell size, compared to pure PUR foams. Among all the modified PUR foams, the greatest improvement of mechanical characteristics was observed for PUR foams with the addition of silanized WS—the compressive, flexural, and impact strength were enhanced by 21, 16, and 13%, respectively. The addition of nontreated and chemicallytreated WS improved the thermomechanical stability of PUR foams. The results of the dynamic mechanical analysis confirmed an increase in glass transition temperature and storage modulus of PUR foams after the incorporation of chemicallytreated WS. The addition of nontreated and chemicallytreated WS did not affect the insulating properties of PUR foams, and the thermal conductivity value did not show any significant improvement and deterioration due to the addition of WS fillers.
topic rigid polyurethane foams
lignocellulosic materials
filler
chemical treatment
mechanical characteristics
url https://www.mdpi.com/1996-1944/13/15/3245
work_keys_str_mv AT sylwiaczłonka rigidpolyurethanefoamsbasedonbiopolyolandadditionallyreinforcedwithsilanizedandacetylatedwalnutshellsforthesynthesisofenvironmentallyfriendlyinsulatingmaterials
AT annastrakowska rigidpolyurethanefoamsbasedonbiopolyolandadditionallyreinforcedwithsilanizedandacetylatedwalnutshellsforthesynthesisofenvironmentallyfriendlyinsulatingmaterials
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