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Towards molecular design of the cellulose/polycaprolactoneinterphase: engineering of debonding toughness
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.ORCID-id: 0000-0001-7132-3251
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.ORCID-id: 0000-0001-9832-027X
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.ORCID-id: 0000-0002-9372-0829
Visa övriga samt affilieringar
(Engelska)Ingår i: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126Artikel i tidskrift (Refereegranskat) Submitted
Nationell ämneskategori
Kemiteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-10484OAI: oai:DiVA.org:kth-10484DiVA, id: diva2:217960
Anmärkning
QS 20120328Tillgänglig från: 2009-05-18 Skapad: 2009-05-18 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
Ingår i avhandling
1. Ring-opening polymerization from cellulose for biocomposite applications
Öppna denna publikation i ny flik eller fönster >>Ring-opening polymerization from cellulose for biocomposite applications
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

There is an emerging interest in the development of sustainable materials with high performance. Cellulose is promising in this regard as it is a renewablere source with high specific properties, which can be utilized as strong reinforcements in novel biocomposites. However, to fully exploit the potential ofcellulose, its inherent hydrophilic character has to be modified in order toimprove the compatibility and interfacial adhesion with the more hydrophobicpolymer matrices commonly used in composites.In this study, the grafting of poly(ε-caprolactone) (PCL) and poly(L-lactide)(PLLA) from cellulose surfaces, via ring-opening polymerization (ROP) of ε-caprolactone and L-lactide, was investigated. Both macroscopic and nano-sizedcellulose were explored, such as filter paper, microfibrillated cellulose (MFC),MFC-films, and regenerated cellulose spheres. It was found that thehydrophobicity of the cellulose surfaces increased with longer graft lengths, andthat polymer grafting rendered a smoother surface morphology.To improve the grafting efficiency in the ROP from filter paper, both covalent(bis(methylol)propionic acid, bis-MPA) and physical pretreatment (xyloglucanbisMPA)were explored. The highest grafting efficiency was obtained with ROPfrom the bis-MPA modified filter papers, which significantly increased amountof polymer on the surface, i.e. the thickness of the grafted polymer layer.MFC was grafted with PCL to different molecular weights. The dispersability innon-polar solvent was obviously improved for the PCL grafted MFC, incomparison to neat MFC, and the stability of the MFC suspensions was better maintained with longer grafts. PCL based biocomposites were prepared from neat MFC and PCL grafted MFCwith different graft lengths. The polymer grafting improved the mechanical properties of the composites, and the best reinforcing effect was obtained when PCL grafted MFC with the longest grafts were used as reinforcement.A bilayer laminate consisting of PCL and MFC-films grafted with different PCL graft lengths displayed a gradual increase in the interfacial adhesion with increasing graft length.The effect of grafting on the adhesion was also investigated via colloidal probeatomic force microscopy at different temperatures and time in contact. A significant improvement in the adhesion was observed after polymer grafting.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2009. s. 68
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2009:24
Nyckelord
cellulose, ring-opening polymerization, polycaprolactone, grafting from
Nationell ämneskategori
Annan medicinsk grundvetenskap
Identifikatorer
urn:nbn:se:kth:diva-10455 (URN)978-91-7415-338-5 (ISBN)
Disputation
2009-06-05, F3, KTH, Lindstedsvägen 26, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20100730Tillgänglig från: 2009-05-18 Skapad: 2009-05-15 Senast uppdaterad: 2018-01-13Bibliografiskt granskad

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Fogelström, LindaZhou, QiHult, AndersMalmström, Eva

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Lönnberg, HannaFogelström, LindaZhou, QiHult, AndersMalmström, Eva
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