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- Hosseini, Seyedehsan,1994Chalmers tekniska högskola,Chalmers University of Technology (author)
Additive-Driven Improvements in Interfacial Properties and Processing of TMP-Polymer Composites
- BookEnglish2023
Publisher, publication year, extent ...
- Gothenburg,2023
- electronicrdacarrier
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- LIBRIS-ID:oai:research.chalmers.se:802706e2-58c8-487d-b7dc-b18d54f9d15e
- ISBN:9789179059408
- https://research.chalmers.se/publication/537927URI
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- Language:English
- Summary in:English
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- Efforts to address environmental concerns have resulted in new regulations designed to plan the reduction of plastic and synthetic polymer usage, necessitating the search for sustainable natural alternatives with comparable cost-effectiveness and mechanical performance. Thermomechanical pulp (TMP) fibres are one of the most affordable natural fibres that have no chemical refining in production, production have a high yield of 90-98% and TMP fibres have been demonstrated to improve the mechanical characteristics (strength, stiffness and toughness) of wood-polymer composites (WPCs) compared to the pure polymer. The integration of TMP fibres with non-polar synthetic polymers remains a challenge due to surface polarity differences. This PhD thesis aims to ease the processing of TMP fibre composites through the incorporation of additives. The hypothesis posits that incorporating magnesium stearate (MgSt), molybdenum disulfide (MoS2) and alkyl ketene dimer (AKD) as additives in TMP composites will enhance interfacial properties, resulting in improved processability and flow behaviour at high temperatures. MoS2 is known for its interaction with lignin, which exists in TMP and MgSt is recognised for its ability to improve flow in pharmaceutical processing when combined with cellulose, also a component of TMP. AKD modifies the hydrophilic properties of lignocellulosic surfaces. The experimental work explores the effect of these additives on the properties of TMP composites of ethylene acrylic acid copolymer (EAA) and polypropylene (PP) matrices. The dynamic mechanical analysis (DMA) and mechanical analysis results reveal that MoS2 exhibits superior interaction with TMP fibres, yielding enhanced interfacial properties compared to MgSt in between EAA and TMP fibres. Rheological studies elucidate the transition from a fluid-like state to a network-like structure upon the incorporation of TMP into the PP matrix. The incorporation of AKD with C18 reduces the viscosity of TMP-PP composites and PP itself, and, as determined through theoretical Hansen solubility parameter (HSP) calculations, increases compatibility between cellulose in TMP fibres and PP. The addition of AKD influences both the colour (lighter) and shape (smoother surface) of the extrudate filaments in the TMP-PP composites, indicative of improved processing. In addition, frictional analysis demonstrates the reduction of the coefficient of friction (COF) between metal and TMP fibre by MgSt and AKD treatments.
Subject headings and genre
- NATURVETENSKAP Kemi Polymerkemi hsv//swe
- NATURAL SCIENCES Chemical Sciences Polymer Chemistry hsv//eng
- NATURVETENSKAP Kemi Fysikalisk kemi hsv//swe
- NATURAL SCIENCES Chemical Sciences Physical Chemistry hsv//eng
- TEKNIK OCH TEKNOLOGIER Materialteknik Pappers-, massa- och fiberteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Materials Engineering Paper, Pulp and Fiber Technology hsv//eng
- TEKNIK OCH TEKNOLOGIER Materialteknik Bearbetnings-, yt- och fogningsteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Materials Engineering Manufacturing, Surface and Joining Technology hsv//eng
- TEKNIK OCH TEKNOLOGIER Kemiteknik Polymerteknologi hsv//swe
- ENGINEERING AND TECHNOLOGY Chemical Engineering Polymer Technologies hsv//eng
- TEKNIK OCH TEKNOLOGIER Materialteknik Textil-, gummi- och polymermaterial hsv//swe
- ENGINEERING AND TECHNOLOGY Materials Engineering Textile, Rubber and Polymeric Materials hsv//eng
- NATURVETENSKAP Kemi Materialkemi hsv//swe
- NATURAL SCIENCES Chemical Sciences Materials Chemistry hsv//eng
- TEKNIK OCH TEKNOLOGIER Materialteknik Metallurgi och metalliska material hsv//swe
- ENGINEERING AND TECHNOLOGY Materials Engineering Metallurgy and Metallic Materials hsv//eng
- NATURVETENSKAP Kemi Organisk kemi hsv//swe
- NATURAL SCIENCES Chemical Sciences Organic Chemistry hsv//eng
- TEKNIK OCH TEKNOLOGIER Materialteknik Kompositmaterial och -teknik hsv//swe
- ENGINEERING AND TECHNOLOGY Materials Engineering Composite Science and Engineering hsv//eng
- molybdenum disulfide
- magnesium stearate
- thermomechanical pulp
- alkyl ketene dimer
- friction
- rheology
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