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Visualization of poly(methyl methacrylate) (PMMA) grafts on cellulose via high-resolution FT-IR microscopy imaging
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Ytbehandlingsteknik.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Ytbehandlingsteknik.ORCID-id: 0000-0002-8194-0058
Vise andre og tillknytning
2012 (engelsk)Inngår i: Polymer Chemistry, ISSN 1759-9954, Vol. 3, nr 2, s. 307-309Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Cellulose surfaces grafted with PMMA of different graft lengths were characterized via high-resolution FT-IR microscopy imaging, visualizing the polymer distribution on the surface. The results from the FT-IR measurements can be compared with the molecular weights obtained from SEC and (1)H NMR of the macromolecules formed in solution.

sted, utgiver, år, opplag, sider
2012. Vol. 3, nr 2, s. 307-309
Emneord [en]
TRANSFER RADICAL POLYMERIZATION, SURFACES, NANOPARTICLES, FIBER
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-83789DOI: 10.1039/c1py00338kISI: 000298991200006Scopus ID: 2-s2.0-84855651837OAI: oai:DiVA.org:kth-83789DiVA, id: diva2:513729
Merknad
QC 20120403Tilgjengelig fra: 2012-04-03 Laget: 2012-02-13 Sist oppdatert: 2012-11-26bibliografisk kontrollert
Inngår i avhandling
1. ARGET ATRP as a Tool for Cellulose Modification
Åpne denne publikasjonen i ny fane eller vindu >>ARGET ATRP as a Tool for Cellulose Modification
2012 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The importance of finding new applications for cellulose‐based products has increased, especially to meet the demand for new environmentally friendly materials, but also since the digitalization of our society will eventually decrease the need for paper. To expand the application area of cellulose, modification to improve and/or introduce new properties can be a requisite. Thus, the focus of this study has been to achieve fundamental knowledge about polymer grafting of cellulose via well‐controlled radical polymerization.

Cellulose, in the form of filter paper, has successfully been grafted via activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) of the monomers: methyl methacrylate, styrene, and glycidyl methacrylate. The advantages of ARGET ATRP are that only a small amount of a copper catalyst is required and the reaction can be performed in limited amount of air; yet, providing for relatively well‐controlled reactions. These benefits can render ARGET ATRP an attractive method for industrial utilization.

The contact‐angle measurements of the grafted filter papers confirmed that the hydrophobicity of cellulose was significantly increased, even for shorter graft lengths. FT‐IR spectroscopy established that the amount of polymer successively increased with monomer conversion. High‐resolution FT‐IR microscopy (FT‐IRM) was proven to be a very useful technique for the analysis of cellulose substrates, displaying the spatial distribution of polymer content on cellulose fibers. The polymer was shown to be fairly homogenously distributed on the fiber.

An initiator with a reducible disulfide bond rendered cleavage of the polymer grafts possible, employing mild reaction conditions. The cleaved grafts and the free polymers – formed from a sacrificial initiator in parallel to the grafting – were shown to have similar molar masses and dispersities, confirming that the grafts can be tailored by utilizing a sacrificial initiator. Moreover, the initiator content on filter paper and microcrystalline cellulose was assessed.

A comparison between the two grafting techniques, grafting‐from cellulose via ARGET ATRP and grafting‐to cellulose via copper(I)‐catalyzed alkyne‐azide cycloaddition, was performed. To achieve a trustworthy comparison, the free polymer formed in parallel to the grafting‐from reaction was employed as the prepolymer in the grafting‐to approach, resulting in nearly identical graft length on the substrates for the two grafting methods. FT‐IRM analyses verified that under the selected conditions, the grafting‐from technique is superior to the grafting‐to approach with respect to controlling the distribution of the polymer content on the surface. The results were corroborated with X‐ray photoelectron spectroscopy.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2012. s. 62
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2012:60
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-105762 (URN)978-91-7501-544-6 (ISBN)
Disputas
2012-12-14, K2, Teknikringen 28, KTH, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20121126

Tilgjengelig fra: 2012-11-26 Laget: 2012-11-26 Sist oppdatert: 2012-11-26bibliografisk kontrollert

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