A5002628240- Polymer composites and self-healing
- biodegradable polymer synthesis and properties
- Lignin and Wood Chemistry
- Carbon dioxide utilization in catalysis
- Polymer Foaming and Composites
- Polymer Nanocomposites and Properties
- Silicone and Siloxane Chemistry
- Microplastics and Plastic Pollution
- Catalysis for Biomass Conversion
- Synthetic Organic Chemistry Methods
- Biodiesel Production and Applications
- Natural Fiber Reinforced Composites
- Conducting polymers and applications
- Aerogels and thermal insulation
- Botanical Research and Applications
- Catalysis and Oxidation Reactions
- Polydiacetylene-based materials and applications
- Biofuel production and bioconversion
- Plant Surface Properties and Treatments
- Electrospun Nanofibers in Biomedical Applications
- Material Properties and Applications
- Fiber-reinforced polymer composites
- Food Industry and Aquatic Biology
- Water-Energy-Food Nexus Studies
- Synthesis and properties of polymers
Latvian State Institute of Wood Chemistry
2014-2024
Riga Technical University
2016
There is a major international effort to improve the availability of data for life cycle assessment (LCA), as these assessments have become one main pillars driving European policy with respect sustainable use resources. However, there still lack even Europe. This study presents cradle-to-farm gate assessment, or LCA, winter and spring rapeseed produced in northern country Latvia. The LCA model based on an in-depth up-to-date agricultural practice used region covers time span 2008–2016. An...
High-quality rigid polyurethane (PU) foam thermal insulation material has been developed solely using bio-polyols synthesized from second-generation bio-based feedstock. High functionality were cellulose production side stream-tall oil fatty acids by oxirane ring-opening as well esterification reactions with different polyfunctional alcohols, such diethylene glycol, trimethylolpropane, triethanolamine, and diethanolamine. Four high combined bio-polyol obtained tall triethanolamine to develop...
A second-generation bio-based feedstock—tall oil fatty acids—was epoxidised via two pathways. Oxirane rings were introduced into the acid carbon backbone using a heterogeneous epoxidation catalyst-ion exchange resin Amberlite IR-120 H or enzyme catalyst Candida antarctica lipase B under trade name Novozym® 435. High functionality bio-polyols synthesised from obtained epoxidated tall acids by oxirane ring-opening and subsequent esterification reactions with different polyfunctional alcohols:...
Sawdust, microcellulose and nanocellulose their silanized forms were used to reinforce rigid polyurethane (PU) foam composites. The concentration of fillers was varied in the range 0.5–1.5%. For PU formulations, three polyols from recycled renewable materials used, among other components. Polyols obtained rapeseed oil, tall oil fatty acids polyethylene terephthalate. As composites literature have been described as appropriate thermal insulation material, appliance for cryogenic investigated...
In this research, polyols from rapeseed oil and recycled poly(ethylene terephthalate) were synthesized by two-step continuous synthesis with a different concentration. All oil/poly(ethylene showed complete compatibility blowing agent Solkane 365/227. The resulting used to prepare rigid polyurethane foams which characterized various techniques for determination of their physical, mechanical thermal insulation properties. effect concentrations in on the characteristics was investigated....
Bio/recycled polyols from rapeseed oil (RO) and poly(ethylene terephthalate) (PET) were prepared using a continuous, two-step synthesis method. The bio/recycled polyol properties compared to RO commercially available PET based polyols. Rigid polyurethane foams with unified apparent density of 40—45 kg/m3 these thermal conductivity, properties, water absorption mechanical tested. results indicated that the RO/PET can be successfully used for preparing as energy efficient insulation material.
Bio-based rapeseed oil (RO) polyol was synthesized by transesterification with triethanolamine. Synthesized RO/triethanolamine ester modified triethylene glycol (TEG) to obtain a system higher hydroxyl value, as well e-caprolactone (CL) increase the carbon chain length and decrease value. From these polyols there were polyurethane (PU) networks which showed good mechanical properties. It established that increasing urethane groups concentration crosslinking, modulus of elasticity (E) tensile...
Abstract Tall oil fatty acids are a second-generation bio-based feedstock finding application in the synthesis of polyurethane materials. The study reported tall and their methyl esters epoxidation rotating packed bed reactor. chemical structure synthesized epoxidized ester were studied by Fourier-transform infrared spectroscopy. Average molecular weight dispersity determined from gel permeation chromatography data. feasibility multiple uses Amberlite® IRC120 H ion exchange resin as catalyst...
Rapeseed Oil as Renewable Resource for Polyol SynthesisVegetable oils are one of the most important platform chemicals due to their accessibility, specific structure and low price.Rapeseed oil (RO) polyols were prepared by amidization RO with diethanolamine (DEA). To determine kinetics reaction, experiments carried out. Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), amine (NH) value was determined. Group contribution method Fedor‵s used calculate...
A screening Life Cycle Assessment (LCA) of tall oil-based bio-polyols suitable for rigid polyurethane (PU) foams has been carried out. The goal was to identify the hot-spots and data gaps. system under investigation is three different oil fatty acids (TOFA)-based bio-polyol synthesis with a cradle-to-gate approach, from production raw materials TOFA based at pilot-scale reactor. steps that give most significant environmental footprint were identified. results showed bio-based feedstock main...
It is crucial to adapt the processing of forest bio-resources into biochemicals and bio-based advanced materials in order transform current economic climate a greener economy. Tall oil, as by-product Kraft process wood pulp manufacture, promising resource for extraction various value-added products. oil fatty acids-based multifunctional Michael acceptor acrylates were developed. The suitability developed polymerization with tall donor acetoacetates form highly cross-linked polymer material...