| 1. |
- Addison, Glynn
(creator_code:cre_t)
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Compositions comprising photoinitiator and oxetane compound
- 2004
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- An energy curable composition comprises a photoinitiator and a polymerisable compound of formula (I): where: R<1> represents a C1 - C4 alkyl group, an aryl group or an aralkyl group; R<2> represents a group of formula -O-R<3> or a group R<4>; R<3> represents a C1 - C20 alkyl group, a C2 - C20 alkenyl group, an aryl group, an aralkyl group, a polyalkylene oxide group or a poly(lactone group); R<4> represents a C1 - C20 alkyl group, an aryl group or an aralkyl group; x is a number greater than 1 and no greater than 4; and (x + y) = 4. The composition may be used in printing ink or varnish.
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| 2. |
- Gavelin, Patrik
(creator_code:cre_t)
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Beaded and cross-linked poly(aminoalkylene) matrix and uses thereof
- 2007
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- The present invention relates to the synthesis of a beaded and cross-linked, high loading capacity polymer for solid phase synthesis, purification of reaction mixtures, chromatographic separation procedures, and the like. The invention can thus be used for the isolation of molecular entities having an affinity for the polymer beads or a chemical entity attached thereto. The beaded polymer matrix can be formed by cross-linking an optionally substituted poly(aminoalkylene), under inverse suspension or inverse emulsion polymerisation conditions, with a cross-linking unit of functionality =2.
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| 3. |
- Glaser, Sara Jonsdottir, et al.
(författare)
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Carboligation of 5-(hydroxymethyl)furfural via whole-cell catalysis to form C12 furan derivatives and their use for hydrazone formation
- 2023
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Ingår i: Microbial Cell Factories. - 1475-2859. ; 22
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Biobased 5-(hydroxymethyl)furfural (5-HMF) is an important platform that offers numerous possibilities for upgrading to a range of chemical, material and fuel products. One reaction of special interest is the carboligation of 5-HMF into C 12 compounds, including 5,5'-bis(hydroxymethyl)furoin (DHMF) and its subsequent oxidation to 5,5'-bis(hydroxymethyl)furil (BHMF), due to their potential applications as building blocks for polymers and hydrocarbon fuels. OBJECTIVES: This study was aimed at evaluating the use of whole cells of Escherichia coli carrying recombinant Pseudomonas fluorescens benzaldehyde lyase as biocatalysts for 5-HMF carboligation, recovery of the C 12 derivatives DHMF and BHMF, and testing the reactivity of the carbonyl groups for hydrazone formation for potential use as cross-linking agents in surface coatings. The effects of different parameters on the reaction were investigated to find the conditions for achieving high product yield and productivity. RESULTS: The reaction with 5 g/L 5-HMF using 2 g CDW/L recombinant cells in 10% dimethyl carbonate, pH 8.0 at 30 °C resulted in DHMF yield of 81.7% (0.41 mol/mol) at 1 h, and BHMF yield of 96.7% (0.49 mol/mol) at 72 h reaction time. Fed-batch biotransformation generated a maximum DHMF concentration of 53.0 g/L (or 26.5 g DHMF/g cell catalyst) with productivity of 10.6 g/L .h, after five feeds of 20 g/L 5-HMF. Both DHMF and BHMF reacted with adipic acid dihydrazide to form hydrazone that was confirmed by Fourier-transform infrared spectroscopy and 1H NMR. CONCLUSION: The study demonstrates the potential application of recombinant E. coli cells for cost-effective production of commercially relevant products.
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| 4. |
- Gonzalez-Martinez, Juan F, et al.
(författare)
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Effect of Relative Humidity on the Viscoelasticity of Thin Organic Films Studied by Contact Thermal Noise AFM
- 2019
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Ingår i: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 35:18, s. 6015-6023
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Tidskriftsartikel (refereegranskat)abstract
- Material scientists are in need of experimental techniques that facilitate a quantitative mechanical characterization of mesoscale materials and, therefore, their rational design. An example is that of thin organic films, as their performance often relates to their ability to withstand use without damage. The mechanical characterization of thin films has benefited from the emergence of the atomic force microscope (AFM). In this regard, it is of relevance that most soft materials are not elastic but viscoelastic instead. While most AFM operation modes and analysis procedures are suitable for elasticity studies, the use of AFM for quantitative viscoelastic characterizations is still a challenge. This is now an emerging topic due to recent developments in contact resonance AFM. The aim of this work was to further explore the potential of this technique by investigating its sensitivity to viscoelastic changes induced by environmental parameters, specifically humidity. Here, we show that by means of this experimental approach, it was possible to quantitatively monitor the influence of humidity on the viscoelasticity of two different thin and hydrophobic polyurethane coatings representative of those typically used to protect materials from processes like weathering and wear. The technique was sensitive even to the transition between the antiplasticizing and plasticizing effects of ambient humidity. Moreover, we showed that this was possible without the need of externally exciting the AFM cantilever or the sample, i.e., just by monitoring the Brownian motion of cantilevers, which significantly facilitates the implementation of this technique in any AFM setup.
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| 5. |
- Gonzalez-Martinez, Juan Francisco, et al.
(författare)
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Humidity-induced phase transitions of surfactants embedded in latex coatings can drastically alter their water barrier and mechanical properties
- 2018
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Ingår i: Polymers. - : MDPI. - 2073-4360. ; 10
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Tidskriftsartikel (refereegranskat)abstract
- Latex coatings are environmentally friendly i.e., they are formed from aqueous polymer dispersions, are cheap to produce and provide exceptional mechanical properties. Therefore, they are ubiquitous and can be found in a wide range of different applications such as paints and varnishes, pressure-sensitive adhesives, textiles, construction materials, paper coatings and inks. However, they also have weaknesses and their surfactant content is among them. Surfactants are often needed to stabilize polymer particles in the aqueous latex dispersions. These surfactants also form part of the coatings formed from these dispersions, and it is well-known that they can lower their performance. This work further explores this aspect and focuses on the role that embedded surfactant domains play in the response of latex coatings to humid environments. For this purpose, we made use of several experimental techniques where humidity control was implemented: quartz crystal microbalance with dissipation, atomic force microscopy and differential scanning calorimetry. By means of this multimethodological approach, we report that surfactants embedded in latex coatings can undergo humidity-induced transitions towards more hydrated and softer phases, and that this results in a drastic decrease of the mechanical and water barrier properties of the whole coatings. Subsequently, this work highlights the potential of taking into account the phase behavior of surfactants when choosing which ones to use in the synthesis of latex dispersions as this would help in predicting their performance under different environmental conditions.
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| 6. |
- Gonzalez-Martinez, Juan Francisco, et al.
(författare)
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The role of cross-linking in the scratch resistance of organic coatings : An investigation using Atomic Force Microscopy
- 2019
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Ingår i: Wear. - : Elsevier. - 0043-1648 .- 1873-2577. ; 418-419, s. 151-159
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Tidskriftsartikel (refereegranskat)abstract
- Understanding how the composition of organic coatings influences their ability to resist surface damage during use remains a challenge. A relevant potential influence is that of cross-linking density. This parameter is frequently used for tailoring the mechanical properties of organic coatings and it manifests itself in terms of scratch resistance. However, the mechanisms that influence scratch resistance are not fully understood. From a thermodynamic perspective, wear of coatings is related to their ability to dissipate friction energy. Hence, it would be reasonable to assume that cross-linking influences the scratch resistance of coatings by influencing their viscoelasticity, as this is one of the parameters that define energy dissipation during shear. This hypothesis was investigated by studying two similar waterborne polyurethane coatings that have different cross-linking properties. The multiple abilities of Atomic Force Microscopy (AFM) were used to characterize the coatings’ scratch resistance, frictional properties, stiffness, adhesiveness and viscoelasticity. Significantly, it was found that monitoring the thermal noise of AFM cantilevers in contact with the coatings was sensitive enough to quantify the effects of cross-linking on their viscoelasticity. Based on this work, cross-linking is proposed to enhance scratch resistance by elastically storing, and eventually releasing, part of the mechanical energy that was transferred to the coatings during shear.
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| 7. |
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| 8. |
- Hatti-Kaul, Rajni, et al.
(författare)
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Designing Biobased Recyclable Polymers for Plastics
- 2020
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Ingår i: Trends in Biotechnology. - : Elsevier BV. - 0167-7799. ; 38:1, s. 50-67
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Forskningsöversikt (refereegranskat)abstract
- Several concurrent developments are shaping the future of plastics. A transition to a sustainable plastics system requires not only a shift to fossil-free feedstock and energy to produce the carbon-neutral building blocks for polymers used in plastics, but also a rational design of the polymers with both desired material properties for functionality and features facilitating their recyclability. Biotechnology has an important role in producing polymer building blocks from renewable feedstocks, and also shows potential for recycling of polymers. Here, we present strategies for improving the performance and recyclability of the polymers, for enhancing degradability to monomers, and for improving chemical recyclability by designing polymers with different chemical functionalities.
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| 9. |
- Hatti-Kaul, Rajni, et al.
(författare)
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Plast - ett framtidsmaterial
- 2018
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Ingår i: Kemivärlden, Biotech, Kemisk tidskrift. - 1653-5596. ; September:5, s. 39-39
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 10. |
- Lars, Persson
(creator_code:cre_t)
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A heterocyclic chemical compound
- 1997
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- A heterocyclic chemical compound of formula (1) or (2) or a neutral or acidic salt thereof where the counter ion is LI+, Na+, K+, Mg2+, Ca2+, NH4+ or another pharmacologically acceptable positively charged inorganic or organic ion or any combination thereof. The compound contains B, Si, N, P, S or Se in the ring structure.
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