Supported ultrathin films and non-woven fibre mats from polysaccharide containing bicomponent polymer blends

Laura Taajamaa

Supported ultrathin films and non-woven fibre mats from polysaccharide containing bicomponent polymer blends

Julkaisun otsikon käännös: Polysakkaridipohjaisten polymeeriseosten ohutkalvoista ja kuitumatoista

Laura Taajamaa

Tutkimustuotos: Doctoral Thesis › Collection of Articles

Abstrakti

Verrattaessa öljypohjaisiin kemikaaleihin, polysakkaridit ovat askel kohti ympäristöystävällisempiä ja kestävän kehityksen mukaisia tuotteita. Selluloosa on yleisin biopolymeeri ja viime aikoina se on herättänyt kasvavaa kiinnostusta nanomateriaalien raaka-aineena muun muassa erinomaisten mekaanisten ja optisten ominaisuuksiensa ansiosta. Tämän työn tarkoituksena oli tuottaa perustietoa selluloosan ohutkalvoista, tarkemmin niiden pinnan morfologiasta, sen kehittymisestä sekä kalvojen ominaisuuksien muokkaamisesta. Kehitettyjen pinnanmuokkausmenetelmien lisäksi väitöskirjassa siirrettiin kaksiulotteisten ohutkalvojen pinnanmuodot kolmiulotteisiin kuitumattoihin. Nanotieteen yhtenä tavoitteena on muodostaa hierarkkisia rakenteita, joilla on suuri pinta-ala niiden tilavuuteen nähden. Haasteena on esimerkiksi nano- ja mikroskaalan kuvioiden rakentaminen ohuisiin polymeerikalvoihin. Eräs yksinkertainen lähestymistapa on käyttää spin coating –tekniikkaa polymeerien seoksille. Kuviot muodostuvat ohutkalvon pinnalle substraatin, liuottimen sekä polymeeriseoksen komponenttien vuorovaikutuksesta, kun liuottimen haihtuminen sysää kalvon pois termodynaamisesta tasapainosta. Polymeerien seoskalvojen sovelluskohteet vaihtelevat perustutkimuksesta hohtodiodeihin ja lääkeaineiden annosteluun. Väitöskirjan alussa paneuduttiin selluloosan ja vettä hylkivän polymeerin seoskalvoihin. Työssä kehitettiin menetelmä kyseisten seosohutkalvojen pinnan kemian ja morfologian muokkaamiseen. Ominaisuuksien muokkausta hallitaan ja säädellään alkuperäisen polymeeriliuoksen komponenttien seossuhdetta säätämällä. Lisäksi tutkittiin nanopartikkeleiden kiinnittämistä määrättyihin osiin selluloosakalvoa. Työn jälkimmäisessä osassa keskityttiin kahden selluloosajohdannaisen seoskalvoihin, joissa havaittiin toisen seoskomponentin alueelle keskittyneitä huokosia. Lisäksi syvennyttiin ilmankosteuden vaikutukseen morfologian muodostumisessa ja sen kehittymisessä. Lopuksi työssä valmistettiin selluloosajohdannaisten seoskuitumattoja sähkökehruulla. Työssä tutkittiin myös kuitumaton ominaisuuksien muokkaamista yksittäistä selluloosajohdannaista muokkaamalla. Väitöskirjassa syvennettiin ymmärtämystä erilaisista polymeeriseosten muodostamista rakenteista. Työ koostui neljästä osasta, joissa paneuduttiin selluloosan johdannaisia sisältävien polymeeriseosten ohutkalvojen ja kuitumattojen rakenteen muodostumiseen sekä muokkaukseen. Tämän tutkimuksen tarkoituksena oli myös helpottaa selluloosatutkimuksen poikkitieteellistä yhteistyötä.

Julkaisun otsikon käännös	Polysakkaridipohjaisten polymeeriseosten ohutkalvoista ja kuitumatoista
Alkuperäiskieli	Englanti
Pätevyys	Tohtorintutkinto
Myöntävä instituutio	Aalto-yliopisto
Valvoja/neuvonantaja	Laine, Janne, Vastuuprofessori Kontturi, Eero, Ohjaaja Rojas Gaona, Orlando, Ohjaaja
Kustantaja	Aalto University
Painoksen ISBN	978-952-60-5730-9
Sähköinen ISBN	978-952-60-5731-6
Tila	Julkaistu - 2014
OKM-julkaisutyyppi	G5 Artikkeliväitöskirja

Tutkimusalat

polysakkaridi
selluloosa
selluloosan johdannainen
polymeeriseos
spin coating–tekniikka
sähkökehruu
ohutkalvo
kuitumatto
muokkaus

Pääsy asiakirjaan

http://urn.fi/URN:ISBN:978-952-60-5731-6Lisenssi: Määrittelemätön

Biotalousinfrastruktuuri
Seppälä, J. (Manager)
Kemian tekniikan korkeakoulu
Laitteistot/tilat: Facility

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@phdthesis{41b01064c4a2434984f4b65e941138a6,

title = "Supported ultrathin films and non-woven fibre mats from polysaccharide containing bicomponent polymer blends",

abstract = "Compared to petroleum based chemicals, polysaccharides enable sustainable approaches and environmentally friendly products. Cellulose is the most abundant polymer in the biosphere and it has recently gained wide interest as a source for nanomaterials with remarkable strength and liquid crystalline properties. This work is aimed at gaining knowledge on ultrathin cellulose films on solid supports. The morphology, formation and modification of ultrathin cellulose films were investigated from the fundamental point of view. In addition to novel non-covalent surface modification methods in ultrathin cellulose films, the resulting films were converted from 2D structures into 3D fibre systems. Forming functional systems with high surface-to-volume and aspect ratios is an important driver in nanoscience. One challenge is creating nano- and micronscale structures on ultrathin polymer films. A straightforward bottom-up approach to pattern polymeric films is using the spin coating technique for binary polymer blend solutions. Phase separation in the ultrathin films formed results from thermodynamic instabilities generated during the rapid spin coating process and surface patterns emerge from the interactions between the polymer blend components, the solvent and the substrate. The polymer blend films can be used in fundamental studies as well as in applications spanning from controlled drug release to organic light emitting diodes. Ultrathin blend films consisting of cellulose and a hydrophobic polymer were introduced, followed by a method to quantitatively modify the surface chemistry and morphology of the ultrathin cellulose films. A cellulosic template for nanoparticle immobilisation was created. The tailored properties were achieved by the choice of the solution blend ratio used in spin coating. The second part of the thesis focused on the blends of two polysaccharide derivatives. The construction of bicomponent cellulose films with phase-specific pore formation was discussed, along with reasons explaining the genesis and evolution of the given morphologies. Finally, a method to prepare cellulose derivative blend fibre mats by electrospinning that could be selectively modified after fibre formation was unveiled. This thesis represents a fundamental endeavour to deepen our understanding of various polymer blend architectures. It encompassed a set of investigations related to the construction and modification of supported ultrathin films and non-woven fibre mats from blends containing cellulose derivatives. It is expected that results presented in this interdisciplinary area of science can pave the way for the increasing cooperation, enabling future discoveries.",

keywords = "polysaccharide, cellulose, cellulose derivative, polymer blend, spin coating, electrospinning, ultrathin film, fibre mat, modification, polysakkaridi, selluloosa, selluloosan johdannainen, polymeeriseos, spin coating–tekniikka, s{\"a}hk{\"o}kehruu, ohutkalvo, kuitumatto, muokkaus, polysaccharide, cellulose, cellulose derivative, polymer blend, spin coating, electrospinning, ultrathin film, fibre mat, modification",

author = "Laura Taajamaa",

year = "2014",

language = "English",

isbn = "978-952-60-5730-9",

series = "Aalto University publication series DOCTORAL DISSERTATIONS",

publisher = "Aalto University",

number = "87",

address = "Finland",

school = "Aalto University",

}

TY - BOOK

T1 - Supported ultrathin films and non-woven fibre mats from polysaccharide containing bicomponent polymer blends

AU - Taajamaa, Laura

PY - 2014

Y1 - 2014

N2 - Compared to petroleum based chemicals, polysaccharides enable sustainable approaches and environmentally friendly products. Cellulose is the most abundant polymer in the biosphere and it has recently gained wide interest as a source for nanomaterials with remarkable strength and liquid crystalline properties. This work is aimed at gaining knowledge on ultrathin cellulose films on solid supports. The morphology, formation and modification of ultrathin cellulose films were investigated from the fundamental point of view. In addition to novel non-covalent surface modification methods in ultrathin cellulose films, the resulting films were converted from 2D structures into 3D fibre systems. Forming functional systems with high surface-to-volume and aspect ratios is an important driver in nanoscience. One challenge is creating nano- and micronscale structures on ultrathin polymer films. A straightforward bottom-up approach to pattern polymeric films is using the spin coating technique for binary polymer blend solutions. Phase separation in the ultrathin films formed results from thermodynamic instabilities generated during the rapid spin coating process and surface patterns emerge from the interactions between the polymer blend components, the solvent and the substrate. The polymer blend films can be used in fundamental studies as well as in applications spanning from controlled drug release to organic light emitting diodes. Ultrathin blend films consisting of cellulose and a hydrophobic polymer were introduced, followed by a method to quantitatively modify the surface chemistry and morphology of the ultrathin cellulose films. A cellulosic template for nanoparticle immobilisation was created. The tailored properties were achieved by the choice of the solution blend ratio used in spin coating. The second part of the thesis focused on the blends of two polysaccharide derivatives. The construction of bicomponent cellulose films with phase-specific pore formation was discussed, along with reasons explaining the genesis and evolution of the given morphologies. Finally, a method to prepare cellulose derivative blend fibre mats by electrospinning that could be selectively modified after fibre formation was unveiled. This thesis represents a fundamental endeavour to deepen our understanding of various polymer blend architectures. It encompassed a set of investigations related to the construction and modification of supported ultrathin films and non-woven fibre mats from blends containing cellulose derivatives. It is expected that results presented in this interdisciplinary area of science can pave the way for the increasing cooperation, enabling future discoveries.

AB - Compared to petroleum based chemicals, polysaccharides enable sustainable approaches and environmentally friendly products. Cellulose is the most abundant polymer in the biosphere and it has recently gained wide interest as a source for nanomaterials with remarkable strength and liquid crystalline properties. This work is aimed at gaining knowledge on ultrathin cellulose films on solid supports. The morphology, formation and modification of ultrathin cellulose films were investigated from the fundamental point of view. In addition to novel non-covalent surface modification methods in ultrathin cellulose films, the resulting films were converted from 2D structures into 3D fibre systems. Forming functional systems with high surface-to-volume and aspect ratios is an important driver in nanoscience. One challenge is creating nano- and micronscale structures on ultrathin polymer films. A straightforward bottom-up approach to pattern polymeric films is using the spin coating technique for binary polymer blend solutions. Phase separation in the ultrathin films formed results from thermodynamic instabilities generated during the rapid spin coating process and surface patterns emerge from the interactions between the polymer blend components, the solvent and the substrate. The polymer blend films can be used in fundamental studies as well as in applications spanning from controlled drug release to organic light emitting diodes. Ultrathin blend films consisting of cellulose and a hydrophobic polymer were introduced, followed by a method to quantitatively modify the surface chemistry and morphology of the ultrathin cellulose films. A cellulosic template for nanoparticle immobilisation was created. The tailored properties were achieved by the choice of the solution blend ratio used in spin coating. The second part of the thesis focused on the blends of two polysaccharide derivatives. The construction of bicomponent cellulose films with phase-specific pore formation was discussed, along with reasons explaining the genesis and evolution of the given morphologies. Finally, a method to prepare cellulose derivative blend fibre mats by electrospinning that could be selectively modified after fibre formation was unveiled. This thesis represents a fundamental endeavour to deepen our understanding of various polymer blend architectures. It encompassed a set of investigations related to the construction and modification of supported ultrathin films and non-woven fibre mats from blends containing cellulose derivatives. It is expected that results presented in this interdisciplinary area of science can pave the way for the increasing cooperation, enabling future discoveries.

KW - polysaccharide

KW - cellulose

KW - cellulose derivative

KW - polymer blend

KW - spin coating

KW - electrospinning

KW - ultrathin film

KW - fibre mat

KW - modification

KW - polysakkaridi

KW - selluloosa

KW - selluloosan johdannainen

KW - polymeeriseos

KW - spin coating–tekniikka

KW - sähkökehruu

KW - ohutkalvo

KW - kuitumatto

KW - muokkaus

KW - polysaccharide

KW - cellulose

KW - cellulose derivative

KW - polymer blend

KW - spin coating

KW - electrospinning

KW - ultrathin film

KW - fibre mat

KW - modification

M3 - Doctoral Thesis

SN - 978-952-60-5730-9

T3 - Aalto University publication series DOCTORAL DISSERTATIONS

PB - Aalto University

ER -

Supported ultrathin films and non-woven fibre mats from polysaccharide containing bicomponent polymer blends

Abstrakti

Tutkimusalat

Pääsy asiakirjaan

Sormenjälki

Laitteet

Biotalousinfrastruktuuri

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