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Linear vs. Hyperbranched Polymers in the Preparation of Polymer/Clay Nanocomposites
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Ytbehandlingsteknik.ORCID-id: 0000-0001-7132-3251
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Ytbehandlingsteknik.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Ytbehandlingsteknik.ORCID-id: 0000-0002-8194-0058
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Ytbehandlingsteknik.ORCID-id: 0000-0002-9372-0829
Visa övriga samt affilieringar
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nyckelord [en]
polymer composite materials, polymer chemistry, polymer materials
Nationell ämneskategori
Polymerteknologi
Identifikatorer
URN: urn:nbn:se:kth:diva-13492OAI: oai:DiVA.org:kth-13492DiVA, id: diva2:325838
Anmärkning

QC 20100621

Tillgänglig från: 2010-06-21 Skapad: 2010-06-21 Senast uppdaterad: 2016-08-25Bibliografiskt granskad
Ingår i avhandling
1. Polymer Nanocomposites in Thin Film Applications
Öppna denna publikation i ny flik eller fönster >>Polymer Nanocomposites in Thin Film Applications
2010 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The introduction of a nanoscopic reinforcing phase to a polymer matrix offers great possibilities of obtaining improved properties, enabling applications outside the boundaries of traditional composites.

The majority of the work in this thesis has been devoted to polymer/clay nanocomposites in coating applications, using the hydroxyl-functional hyperbranched polyester Boltorn® as matrix and montmorillonite clay as nanofiller. Nanocomposites with a high degree of exfoliation were readily prepared using the straightforward solution-intercalation method with water as solvent. Hard and scratch-resistant coatings with preserved flexibility and transparency were obtained, and acrylate functionalization of Boltorn® rendered a UV-curable system with similar property improvements. In order to elucidate the effect of the dendritic architecture on the exfoliation process, a comparative study on the hyperbranched polyester Boltorn® and a linear analogue of this polymer was performed. X-ray diffraction and transmission electron microscopy confirmed the superior efficiency of the hyperbranched polymer in the preparation of this type of nanocomposites.

Additionally, an objective of this thesis was to investigate how cellulose nanofibers can be utilized in high performance polymer nanocomposites. A reactive cellulose “nanopaper” template was combined with a hydrophilic hyperbranched thermoset matrix, resulting in a unique nanocomposite with significantly enhanced properties. Moreover, in order to fully utilize the great potential of cellulose nanofibers as reinforcement in hydrophobic polymer matrices, the hydrophilic surface of cellulose needs to be modified in order to improve the compatibility. For this, a grafting-from approach was explored, using ring-opening polymerization of ε-caprolactone (CL) from microfibrillated cellulose (MFC), resulting in PCL-modified MFC. It was found that the hydrophobicity of the cellulose surfaces increased with longer graft lengths, and that polymer grafting rendered a smoother surface morphology. Subsequently, PCL-grafted MFC film/PCL film bilayer laminates were prepared in order to investigate the interfacial adhesion. Peel tests demonstrated a gradual increase in the interfacial adhesion with increasing graft lengths.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2010. s. 66
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2010:12
Nyckelord
Nanocomposites, hyperbranched polymers, montmorillonite, clay nanoparticles, exfoliated, coatings, crosslinking, TEM, XRD, mechanical properties, thermal properties, cellulose nanofibers, Atom Transfer Radical Polymerization, Ring-Opening Polymerization, poly(ε-caprolactone), surface modification, grafting, interfacial adhesion
Nationell ämneskategori
Polymerkemi
Identifikatorer
urn:nbn:se:kth:diva-12400 (URN)978-91-7415-615-7 (ISBN)
Disputation
2010-05-07, D1, Lindstedtsvägen 17, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC20100621Tillgänglig från: 2010-04-20 Skapad: 2010-04-16 Senast uppdaterad: 2012-03-28Bibliografiskt granskad

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Fogelström, LindaCarlmark, AnnaHult, AndersMalmström, Eva

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