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Molecular Engineering of the Cellulose-Poly(Caprolactone) Bio-Nanocomposite Interface by Reactive Amphiphilic Copolymer Nanoparticles
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).ORCID iD: 0000-0001-5818-2378
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-8348-2273
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2019 (English)In: ACS NANO, Vol. 13, no 6, p. 6409-6420Article in journal (Refereed) Published
Abstract [en]

A molecularly engineered water-borne reactive compatibilizer is designed for tuning of the interface in melt-processed thermoplastic poly(caprolactone) (PCL)-cellulose nanocomposites. The mechanical properties of the nanocomposites are studied by tensile testing and dynamic mechanical analysis. The reactive compatibilizer is a statistical copolymer of 2-(dimethylamino)ethyl methacrylate and 2-hydroxy methacrylate, which is subsequently esterified and quaternized. Quaternized ammonium groups in the reactive compatibilizer electrostatically match the negative surface charge of cellulose nanofibrils (CNFs). This results in core-shell CNFs with a thin uniform coating of the compatibilizer. This promotes the dispersion of CNFs in the PCL matrix, as concluded from high-resolution scanning electron microscopy and atomic force microscopy. Moreover, the compatibilizer "shell" has methacrylate functionalities, which allow for radical reactions during processing and links covalently with PCL. Compared to the bio-nanocomposite reference, the reactive compatibilizer (<4 wt %) increased Young's modulus by about 80% and work to fracture 10 times. Doubling the amount of peroxide caused further improved mechanical properties, in support of effects from higher cross-link density at the interface. Further studies of interfacial design in specific nanocellulose-based composite materials are warranted since the detrimental effects from CNFs agglomeration may have been underestimated.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 13, no 6, p. 6409-6420
Keywords [en]
biocomposite, nanocellulose, reactive processing, mechanical properties, interphase, interface, biodegradable
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-255446DOI: 10.1021/acsnano.8b08257ISI: 000473248300027PubMedID: 31083978Scopus ID: 2-s2.0-85066407552OAI: oai:DiVA.org:kth-255446DiVA, id: diva2:1344286
Note

QC 20190820

Available from: 2019-08-20 Created: 2019-08-20 Last updated: 2019-08-20Bibliographically approved

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Kaldéus, TahaniTräger, AndreaBerglund, LarsMalmström, EvaLo Re, Giada

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Kaldéus, TahaniTräger, AndreaBerglund, LarsMalmström, EvaLo Re, Giada
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Wallenberg Wood Science CenterSchool of Engineering Sciences in Chemistry, Biotechnology and Health (CBH)Fibre- and Polymer TechnologyBiocomposites
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