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Tall Oil Fatty Acid-Based Alkyd-Acrylic Copolymers

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Tall Oil Fatty Acid-Based Alkyd-Acrylic Copolymers Laboratory of Polymer Chemistry Department of Chemistry University of Helsinki Helsinki, Finland TALL OIL FATTY ACID-BASED ALKYD- ACRYLIC COPOLYMERS: SYNTHESIS, CHARACTERIZATION, AND UTILIZATION IN SURFACE COATING APPLICATIONS Pirita Rämänen ACADEMIC DISSERTATION FOR THE DEGREE OF DOCTOR OF PHILOSOPHY To be presented, with the permission of the Faculty of Science of the University of Helsinki, for public criticism in Auditorium A110 of the Department of Chemistry, on November 28th 2014, at 12 o’clock. Helsinki 2014 Supervisor Professor Sirkka Liisa Maunu Laboratory of Polymer Chemistry Department of Chemistry University of Helsinki Finland Opponent Professor Mats Johansson Department of Fibre and Polymer Technology School of Chemical Science and Engineering Royal Institute of Technology Sweden Reviewers Professor Maija Tenkanen Department of Food and Environmental Sciences University of Helsinki Finland & Professor Eduardo Garcia-Verdugo Department of Inorganic and Organic Chemistry Universitat Jaume I Spain ISBN 978-951-51-0462-5 (paperback) ISBN 978-951-51-0463-2 (PDF) http://ethesis.helsinki.fi Unigrafia Helsinki 2014 ABSTRACT Due to increased awareness of environmental issues and tightened legislation, bio-based substitutes for traditional petroleum-based polymers are being increasingly sought. Tall oil fatty acid (TOFA) is an attractive material for that purpose being a by-product of kraft pulping. Thus, it is abundant year-round, the price is reasonable, and it does not compete with foodstuff materials. In this study, the preparation and properties of TOFA-based waterborne materials for various coating and barrier applications were examined. Alkyd- acrylic copolymers were synthesized from conjugated and nonconjugated fatty acid-based alkyd resins, as well from rapeseed oil-based alkyd resins for comparison. The polymerization was performed in a miniemulsion, because of the stability and copolymer formation issues. The ratio between the alkyd resin and acrylate monomers was varied and the effect on copolymerization and the copolymer binder properties, such as monomer conversion and grafting of acrylate to the alkyd resin was studied. It was observed that the monomers butyl acrylate (BA) and methyl methacrylate (MMA) showed dissimilar affinity for the grafting site. The steric hindrances prevented MMA from reacting with the double bonds of the fatty acids as readily as BA. The allylic, especially the bis-allylic sites, were the principal grafting sites of MMA, for energetic reasons. However, this effectively retarded the polymerization and increased the homopolymerization of the acrylates. Limiting monomer conversion was overcome, using post-initiation. This research showed that it is possible to prepare stable dispersions of TOFA-based alkyd-acrylate copolymers with varied chemical composition. Self-standing films of these dispersions can be prepared and the dispersions applied effortlessly on paperboard and utilized as barrier material. An increased amount of alkyd resin made the copolymer films more brittle and increased their hydrophobicity. Oxygen barrier performance of the materials was not adequate, but was improved with cellulose. Various cellulose types were modified with TOFA to improve the compatibility between cellulose and polymer matrix. Modified cellulose was added to the copolymer dispersion to improve the mechanical and barrier performance of the copolymer films and coatings. Enhanced strength as well as increased oxygen barrier properties were clearly observed when cellulose was used as filler. The water barrier of the coatings was favorable despite the material composition. ACKNOWLEDGEMENTS This research was carried out in the Laboratory of Polymer Chemistry, University of Helsinki, during the years 2005-2014 under the supervision of Professor Sirkka Liisa Maunu. The work was carried out mainly in Finnish BioEconomy Cluster’s (FIBIC) Future Biorefinery (FuBio) research programme. Finnish Funding Agency for Technology and Innovations (TEKES) and Graduate School of Natural Polymers (Luonnonpolymeerien tutkijakoulu) are gratefully acknowledged for funding this research. I wish to express my deepest gratitude to my supervisor Professor Sirkka Liisa Maunu for giving me the opportunity to participate in interesting research projects and for her guidance, encouragement, and patience during these years. I am also very thankful for Professor Heikki Tenhu, the head of the Laboratory of Polymer Chemistry, for creating a pleasant atmosphere in the lab. I thank Professor Maija Tenkanen and Professor Eduardo Garcia-Verdugo for reviewing this thesis and their valuable comments. I would like to thank my collaborators at VTT Technical Research Center of Finland for making the cooperation in these projects enjoyable. I thank Pauliina Pitkänen, Dr. Martta Asikainen, Saila Jämsä, Nina Leppävuori, and Dr. Salme Koskimies for fruitful discussions and providing the alkyd resins, and Soili Takala for performing numerous applications and measurements. I am grateful to Dr. Leena-Sisko Johansson at Aalto University for the XPS measurements. I thank Dr. Sami Hietala, Dr. Vladimir Aseyev, Seija Lemettinen, Juha Solasaari, and Ennio Zuccaro for their kind and valuable help whenever needed. I would like to thank all the members, past and present, of the Laboratory of Polymer Chemistry. Without you the laboratory would not have been such a nice place to work in. Special thanks go to Tommi for his help and patience relating to NMR issues, Pekka for assistance with the synthesis work, and Joonas for all the help and substituting for me at the important moment. Finally, warmest thanks go to my parents, siblings, and friends for all the support they have given me during these years. My dear husband, Juha, without you I would not be here. Thank you for all your love, encouragement, and patience. My little sweetie, Silja, you didn’t make this easier, but showed the meaning of life. CONTENTS Abstract ....................................................................................................................... 3 Acknowledgements .................................................................................................... 4 Contents ...................................................................................................................... 5 List of original publications ...................................................................................... 7 Abbreviations and symbols ....................................................................................... 8 1 Introduction .................................................................................................... 10 1.1 Background ............................................................................................ 10 1.2 Alkyd resin ............................................................................................... 11 1.3 Alkyd-acrylic copolymers ...................................................................... 13 1.4 The drying process ................................................................................. 16 1.5 Barrier dispersions ................................................................................ 18 1.6 Objectives of this study.......................................................................... 20 2 Experimental ................................................................................................... 21 2.1 Materials ................................................................................................. 21 2.1.1 Synthesis of copolymers ..................................................................... 21 2.1.2 Celluloses used as fillers ..................................................................... 24 2.1.3 Films and coatings .............................................................................. 25 2.2 Characterization ..................................................................................... 25 3 Results and discussion ................................................................................... 27 3.1 Alkyd resin structureII ........................................................................... 27 3.2 Alkyd-acrylate copolymers .................................................................... 29 3.2.1 ConversionI,III ...................................................................................... 29 3.2.2 Particle sizeI ......................................................................................... 31 3.2.3 Acrylic degree of grafting and grafting sites in alkyd resinI-III ........ 32 3.2.4 Thermal propertiesI,III ........................................................................ 36 3.3 Surface modification of celluloseIV ...................................................... 38 3.3.1 Surface modification .......................................................................... 38 3.3.2 Degree of substitution ........................................................................ 40 3.4 Film properties ....................................................................................... 41 3.4.1 Oxidative dryingI,II ............................................................................. 42 3.4.2 Mechanical propertiesIII .................................................................... 42 3.4.3 Barrier propertiesIII, unpublished data ........................................................45 3.4.4 Effect of celluloseunpublished data ..........................................................
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