Article
Polymer Science
Marta Worzakowska
Summary: The preparation and properties of starch-graft-poly(hexyl acrylate) copolymers were studied, including chemical stability, solution properties, moisture absorption, gelation ability, glass transition temperatures, thermal stabilities, and decomposition course. It was found that as the grafting percent increases, the copolymers exhibit higher chemical resistance in various environments and increased solubility in non-polar solvents. However, their solubility in polar solvents decreases compared to starch. The copolymer's Tg is in the range of 102-133 degrees C, higher than that of poly(hexyl acrylate) homopolymer. The thermal stability of the copolymers is higher than 274 degrees C (inert conditions) and 230 degrees C (oxidative conditions). Decomposition of the copolymers in inert and oxidative conditions occurs in two main and three main stages, respectively, with the emission of various volatile compounds.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Analytical
Marta Worzakowska
Summary: This paper presents the evaluation of the pyrolysis and oxidative decomposition paths of poly(geranyl methacrylate)-co-poly(benzyl methacrylate) copolymers (GM-co-BM) using simultaneous TG/FTIR/QMS analysis. The tested polymers are environmentally friendly, high chemical and solvent resistant materials with a glass transition temperature below 47°C. Pyrolysis took place in one main stage, while oxidative decomposition occurred in two main stages. The type of formed volatiles indicated that the pyrolysis and oxidative decomposition were initiated by a radical mechanism.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Review
Chemistry, Applied
Roman Sarder, Emily Piner, David Cruz Rios, Lisandra Chacon, Mirela Angelita Artner, Nelson Barrios, Dimitris Argyropoulos
Summary: The versatility of starch has inspired the development of high-performance biomaterials for biomedical applications such as drug delivery and tissue engineering. Starch-based materials can be customized for specific applications through grafting or other chemistries, with starch serving as the template. Considerable research has been conducted on tailored starch-based grafted polymers, taking advantage of their biocompatibility and biodegradability. This review critically explores the latest research on grafting chemistries on starch for biomedical applications, including greener synthetic approaches, the use of enzymes and alternative solvent systems.
CARBOHYDRATE POLYMERS
(2022)
Article
Biochemistry & Molecular Biology
Wei Li, Lanjuan Wu, Zhifeng Zhu, Zhengqiao Zhang, Qian Liu, Yuhao Lu, Huizhen Ke
Summary: The study aimed to investigate the influence of PSAS branches on the sizing properties of corn starch, leading to the development of a new starch-based size. Results showed that S-g-PSAS exhibited improved adhesion, viscosity stability, desizability, and film properties compared to HS, with enhancements in bonding forces, viscosity stability, and film properties at higher grafting ratios. This suggests potential for S-g-PSAS as a sizing agent for cotton and viscose fibers.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Polymer Science
Cynthia G. Flores-Hernandez, Maria de los Angeles Cornejo-Villegas, Abigail Moreno-Martell, Alicia Del Real
Summary: The study aimed to obtain a new biodegradable graft polymer through two chemical processes, FTIR and TGA analysis confirmed its structure and thermal properties, with strong impact on fungal growth.
Article
Chemistry, Applied
Julie Meimoun, Vincent Wiatz, Rene Saint-Loup, Julien Parcq, Adelina David, Gregory Stoclet, Valerie Gaucher, Audrey Favrelle-Huret, Fanny Bonnet, Philippe Zinck
Summary: A new method for dual functionalization of starch via a one pot one step reaction in aqueous medium achieved grafting of poly(butyl acrylate) or poly(butyl acrylate-co-styrene) onto starch, resulting in copolymers with excellent mechanical properties and dual glass transition temperatures.
CARBOHYDRATE POLYMERS
(2021)
Article
Biochemistry & Molecular Biology
Xiaojian Chen, Ce Sun, Qiong Wang, Haiyan Tan, Yanhua Zhang
Summary: In this study, cassava starch was used to prepare environmentally friendly and high-performance starch-based adhesives. The grafting and cross-linking reactions improved the hydrophobicity and wet shear strength of the adhesive. Plywood made with the modified starch adhesive showed better mechanical properties and performance.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Thermodynamics
Marta Worzakowska
Summary: The chemical modification of potato starch with cyclohexyl methacrylate resulted in copolymers with lower polar solvent swelling and higher chemical resistance. These novel materials exhibited excellent thermal stability and the pyrolysis process revealed emission of different structure volatiles.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Environmental
S. M. Daniel Syed Mohamed, Khairul Anwar Ishak, Mohamad Suffian Mohamad Annuar, Thamil Selvi Velayutham
Summary: The effects of different concentrations of MA on the yield and properties of the graft copolymers (PHA-g-MA) were investigated, indicating changes in molecular weight, resistivity to alkali conditions, and thermal stability. The mechanism of the copolymerization was proposed based on the results.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Article
Biochemistry & Molecular Biology
Wei Li, Zhengqiao Zhang, Zhi Liu, Xuchen Tao
Summary: This study investigated the effect of P(AA-co-BA) branches on the sizing properties of bromoisobutyryl esterified starch (BBES) and developed a new biobased sizing agent. The results showed that BBES-g-P(AA-co-BA) had improved paste stability, bonding forces, film properties, and water solubility compared to acid-hydrolyzed starch (AHS) and BBES. The incorporation of P(AA-co-BA) branches further enhanced the sizing qualities of polyester and polyester/cotton blended yarns.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Biochemistry & Molecular Biology
Marta Worzakowska, Malgorzata Sztanke, Krzysztof Sztanke
Summary: This study investigates the thermal properties and decomposition process of a new class of potential anticancer drugs containing asymmetrical triazine template. The experimental methods used were differential scanning calorimetry (DSC) and simultaneous thermogravimetry/differential scanning calorimetry (TG/DTG/DSC) coupled online with Fourier transform infrared spectroscopy (FTIR) and quadrupole mass spectrometry (QMS). The results show that the melting points of the compounds depend on the position and type of substituents, but not on the furnace atmosphere. The compounds exhibit high thermal stability in both inert and oxidizing conditions, with most of them being more stable in oxidizing conditions. The pyrolysis process releases volatiles such as NH3, HNCO, HCN, CO, CO2, H2O, NO2, aromatic amine derivatives, alkenes, and HCl, while the oxidative decomposition process emits NH3, CO2, CO, HCN, HNCO, H2O, aromatics, HCl, N-2, NO2, NH2OH, and (CN)(2). The decomposition is initiated by a radical mechanism and involves the cleavage of C-N and C-C bonds (inert conditions) as well as the reaction of volatiles and residues with oxygen (oxidizing conditions).
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Thermodynamics
Iwona Koltsov
Summary: By utilizing microwave hydrothermal synthesis and gas analysis, this study demonstrates that the PCN-Al2O3-ZrO2 nanocomposite prepared at 400 degrees Celsius exhibits good thermal stability, releasing mainly ammonia, cyanic acid, water, and carbon dioxide during thermal decomposition.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Applied
Gebremedhin Gebremariam Gebremical, Silvia Tappi, Romolo Laurita, Filippo Capelli, Federico Drudi, Pietro Rocculi, Chiara Cevoli, Santina Romani
Summary: Plasma-activated water (PAW) was used to modify the structure and functionality of potato, normal maize, and waxy maize starches, resulting in significant changes in various parameters such as rheological, pasting, and gelatinization properties. FTIR spectroscopy revealed noticeable alterations in functional groups related to water binding ability in all starches.
FOOD HYDROCOLLOIDS
(2023)
Article
Engineering, Chemical
Wei Li, Lanjuan Wu, Zhengqiao Zhang, Huizhen Ke, Qian Liu, Zhifeng Zhu, Zhenzhen Xu, Anfang Wei, Xuedong Cheng
Summary: The study demonstrates that the PAMPS branches have a significant impact on the viscosity stability, adhesion, and desizability of starch, enhancing adhesion to fibers, viscosity stability, and desizability. Gradually improved bonding forces to both fibers, paste stability, and desizability were exhibited with the increase in grafting ratio, indicating the potential of starch-g-PAMPS as a new starch-based size in warp sizing.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2021)
Article
Food Science & Technology
Guanghui Li, Xueli Gao, Yonghui Wang, Shenghua He, Weiyun Guo, Jihong Huang
Summary: This study examined the physical properties of superfine grinding sweet potato leaves (SPLs) powder and their effects on cooking, texture, and sensory properties of starch noodles. The results showed that the physical properties of SPLs powders decreased with milling time increased, and the cooking, texture, and sensory properties of SPLs sweet potato starch noodles (SPLSNs) improved as the particle size of SPLs decreased. The micro- and molecular structures of SPLSNs were also explored.
FOOD SCIENCE & NUTRITION
(2023)
Article
Polymer Science
Marta Worzakowska
EUROPEAN POLYMER JOURNAL
(2019)
Article
Thermodynamics
Marta Worzakowska
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2019)
Article
Engineering, Chemical
Anna Rudawska, Marta Worzakowska, Elzbieta Bociaga, Ewa Olewnik-Kruszkowska
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2019)
Article
Biochemistry & Molecular Biology
Marta Worzakowska
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2019)
Article
Thermodynamics
Marta Worzakowska
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Chemistry, Analytical
Marta Worzakowska, Malgorzata Sztanke, Krzysztof Sztanke
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2019)
Article
Chemistry, Analytical
Marta Worzakowska, Malgorzata Sztanke, Krzysztof Sztanke
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2020)
Article
Thermodynamics
Marta Worzakowska
Summary: The chemical modification of potato starch with cyclohexyl methacrylate resulted in copolymers with lower polar solvent swelling and higher chemical resistance. These novel materials exhibited excellent thermal stability and the pyrolysis process revealed emission of different structure volatiles.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Analytical
Marta Worzakowska, Malgorzata Sztanke, Krzysztof Sztanke
Summary: The pyrolysis and oxidative decomposition processes of a novel class of trifluoromethylated fused triazinones were studied using Simultaneous thermal analysis (STA) coupled online with Fourier transform infrared spectroscopy (FTIR) and Quadrupole mass spectrometry (QMS). It was found that these processes involved simultaneous, radical processes in both helium and air atmospheres, leading to the formation of various volatile products through bond cleavage and radical intermediate reactions. Additionally, the thermal properties and purity of trifluoromethylated compounds were highlighted for potential pharmaceutical applications.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Polymer Science
Marta Worzakowska
Summary: UV polymerization process produced environmentally friendly polymeric materials for use in corrosive conditions. Material properties were found to be directly related to monomer percentage and conditioning temperatures. Increasing levels of geranyl or citronellyl methacrylate reduced solubility and chemical resistance in copolymers post-cured at 50 degrees C, while samples post-cured at 120 degrees C exhibited high resistance to solvents and chemical environment, regardless of composition.
Article
Materials Science, Multidisciplinary
Marta Worzakowska
Summary: Polymer materials were synthesized through UV polymerization of citronellyl methacrylate and benzyl methacrylate with different compositions, resulting in novel environmentally friendly copolymers. These copolymers exhibited high conversion of double bonds and were highly resistant to solvents. The glass transition temperature confirmed their elastomeric nature at room temperature. The thermal stability of the copolymers depended on their composition, and their decomposition occurred mainly through depolymerization and bond breaking.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Thermodynamics
Marta Worzakowska, Malgorzata Sztanke, Krzysztof Sztanke
Summary: The thermal stability of disubstituted fused 1,2,4-triazoles is determined by their structure and the number of chlorine atoms as substituents, leading to a decomposition process with specific volatile emissions in inert conditions and additional combustion in oxidative conditions.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Polymer Science
Marta Worzakowska
Summary: The pyrolysis and thermal oxidation processes of new environmentally friendly copolymers have been examined using TG/FTIR/QMS technique. The obtained copolymers demonstrated excellent resistance to solvents and chemical environment as well as high thermal stability. The composition of the copolymers directly affected their thermal resistance. The decomposition course of tested materials was complex, with depolymerization and additional reactions leading to the emission of various compounds.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Polymer Science
Marta Worzakowska
Summary: The preparation and properties of starch-graft-poly(hexyl acrylate) copolymers were studied, including chemical stability, solution properties, moisture absorption, gelation ability, glass transition temperatures, thermal stabilities, and decomposition course. It was found that as the grafting percent increases, the copolymers exhibit higher chemical resistance in various environments and increased solubility in non-polar solvents. However, their solubility in polar solvents decreases compared to starch. The copolymer's Tg is in the range of 102-133 degrees C, higher than that of poly(hexyl acrylate) homopolymer. The thermal stability of the copolymers is higher than 274 degrees C (inert conditions) and 230 degrees C (oxidative conditions). Decomposition of the copolymers in inert and oxidative conditions occurs in two main and three main stages, respectively, with the emission of various volatile compounds.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Oksana Danylyuk, Marta Worzakowska, Joanna Osypiuk-Tomasik, Volodymyr Sashuk, Karolina Kedra-Krolik
