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Sethi, Jatin
Publications (4 of 4) Show all publications
Sethi, J., Illikainen, M., Sain, M. & Oksman, K. (2017). Polylactic acid/polyurethane blend reinforced with cellulose nanocrystals with semi-interpenetrating polymer network (S-IPN) structure. European Polymer Journal, 86, 188-199
Open this publication in new window or tab >>Polylactic acid/polyurethane blend reinforced with cellulose nanocrystals with semi-interpenetrating polymer network (S-IPN) structure
2017 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 86, p. 188-199Article in journal (Refereed) Published
Abstract [en]

The aim of the current work was to prepare and characterize a cellulose nanocrystal reinforced semi-interpenetrated network (SIPN) derived from polylactic acid (PLA) and polyurethane (PU) polymers. SIPN films were prepared using solvent casting from 1,4-dioxane solution. The morphology, mechanical and thermal properties of the neat SIPN and its nanocomposite were characterized. A novel dispersion method was used, for the first time, to disperse the CNCs into the polyol. This method led to well dispersed CNCs in the SIPN, and at 1 wt% CNC concentration, the elastic modulus of the nanocomposite was improved by 54% over an unreinforced SIPN. Additionally, the results indicated that the toughness of PLA, which is the main polymer phase, was improved. However, in the nanocomposite, CNCs formed a strong network and reinforced the PU phase, which resulted in a lower toughness of the final material. The storage modulus of the SIPN nanocomposite was higher than that of the neat PLA at temperatures higher than 55 °C up to 100 °C. This increase in thermomechanical properties indicates that the reinforced PU network in the PLA matrix can enhance the thermal behavior of material.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-61140 (URN)10.1016/j.eurpolymj.2016.11.031 (DOI)000393088700016 ()2-s2.0-85002689117 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2016-12-19 (andbra)

Available from: 2016-12-19 Created: 2016-12-19 Last updated: 2018-09-13Bibliographically approved
Zhou, X., Sethi, J., Geng, S., Berglund, L., Frisk, N., Aitomäki, Y., . . . Oksman, K. (2016). Dispersion and reinforcing effect of carrot nanofibers on biopolyurethane foams (ed.). Materials & design, 110, 526-531
Open this publication in new window or tab >>Dispersion and reinforcing effect of carrot nanofibers on biopolyurethane foams
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2016 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 110, p. 526-531Article in journal (Refereed) Published
Abstract [en]

In this study, carrot nanofibers (CNF) were used to enhance the performance of biobased castor oil polyol polyurethane nanocomposite foams. A method of dispersing CNF in the polyol was developed and the foam characteristics and CNF reinforcing effect were studied. Co-solvent-assisted mixing resulted in well-dispersed CNF in the polyol, and foams with 0.25, 0.5 and 1 phr CNF content were prepared. The reinforced nanocomposite foams displayed a narrow cell size distribution and the compressive strength and modulus were significantly elevated and the best compressive strength and modulus were reached with 0.5 phr CNF. Similarly, the modulus of the solid material was also significantly increased based on theoretical calculations. When comparing the foam performance, compressive strength and stiffness as a function of the density, the nanocomposite foams performs as commercial rigid PU foam with a closed cell structure. These results are very promising and we believe that these foams are excellent core materials for lightweight sandwich composites.

National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-3617 (URN)10.1016/j.matdes.2016.08.033 (DOI)000385600800058 ()2-s2.0-84982179497 (Scopus ID)1705190f-7be1-4744-b5f9-9d35d898a489 (Local ID)1705190f-7be1-4744-b5f9-9d35d898a489 (Archive number)1705190f-7be1-4744-b5f9-9d35d898a489 (OAI)
Note

Validerad; 2016; Nivå 2; 20160815 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Sethi, J., Illikainen, M., Sain, M. & Oksman, K. (2016). Semi interpenetrating network derived from polylactic acid/polyurethane blend and reinforced with cellulose nanocrystals. In: Posters for Designing cellulose for the future II: . Paper presented at Designing cellulose for the future II, Helsinki, Finland, 16–20 May 2016. Helsinki
Open this publication in new window or tab >>Semi interpenetrating network derived from polylactic acid/polyurethane blend and reinforced with cellulose nanocrystals
2016 (English)In: Posters for Designing cellulose for the future II, Helsinki, 2016Conference paper, Poster (with or without abstract) (Other academic)
Place, publisher, year, edition, pages
Helsinki: , 2016
Keywords
Polyurethane, Polylactic acid, SIPN, Cellulose nanocrystals, Solution processing
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-59726 (URN)
Conference
Designing cellulose for the future II, Helsinki, Finland, 16–20 May 2016
Available from: 2016-10-13 Created: 2016-10-13 Last updated: 2017-11-24Bibliographically approved
Sethi, J., Illikainen, M., Sain, M. & Oksman, K. (2016). Semi-interpenetrating network derived from polylactic acid/polyurethane blend and reinforced with celulose nanocrystals. In: ECCM 2016: Proceeding of  the 17th European conference on composite materials. Paper presented at 17th European conference on composite materials, ECCM-17, Munich, Germany, 26-30 June 2016 (pp. 539-546). European Conference on Composite Materials
Open this publication in new window or tab >>Semi-interpenetrating network derived from polylactic acid/polyurethane blend and reinforced with celulose nanocrystals
2016 (English)In: ECCM 2016: Proceeding of  the 17th European conference on composite materials, European Conference on Composite Materials , 2016, p. 539-546Conference paper, Published paper (Refereed)
Abstract [en]

The current work aims to prepare and characterize bionanocomposites based on cellulose nanocrystals and semi interpenetrating networks prepared from PLA and PU. Nanocrystals were dispersed in PU phase with an innovative, novel method called as co-solvent assisted surfactant-less method. The characterization of the materials was done by tensile testing, differential scanning calorimetry and thermogravimetric analysis. The results were progressive and supported the premise that SIPNs are a viable option to prepare mechanically enhanced hybrid matrix that can impart improved mechanical properties to nanocomposites. Additionally, the dispersion method produced excellent dispersion of nanocrystals in the polyol phase, which was successfully transferred to the nanocomposite

Place, publisher, year, edition, pages
European Conference on Composite Materials, 2016
National Category
Bio Materials Composite Science and Engineering
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-59716 (URN)2-s2.0-85017683055 (Scopus ID)978-3-00-053387-7 (ISBN)
Conference
17th European conference on composite materials, ECCM-17, Munich, Germany, 26-30 June 2016
Available from: 2016-10-13 Created: 2016-10-13 Last updated: 2017-11-24Bibliographically approved
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