Article
Thermodynamics
Xiang Wu, Zhengxin Li, Xinjie Dai, Yan Li, Jin-Rong Zhong, Jinlin Tan, Cui-Hong Lu, Yue-Fei Zhang
Summary: The study focuses on the development of high-performance and low-cost composite nucleating agents for isotactic polypropylene (iPP). The addition of nucleated mineral-reinforced compositions significantly enhances the crystallization temperature and improves the mechanical properties of iPP through the synergistic effect of the composite nucleating agent and inorganic fillers.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Polymer Science
Noelle Billon, Romain Castellani, Jean-Luc Bouvard, Guilhem Rival
Summary: This paper explores the viscoelastic behavior during crystallization and melting of semicrystalline polymers, aiming to propose a preliminary model for the impact of crystallization and melting on the storage and loss moduli. The experimental results suggest that relying solely on the crystalline fraction is insufficient to model the rheology, while considering the microstructure at the spherulitic level could be more helpful. Additionally, the experiments enhance our understanding of the correlations between crystallization kinetics and its mechanical effects.
Article
Polymer Science
Paulina Palafox-Gonzaleza, Luis Roman Rosas-Orta, David Contreras-Lopez, Jose Rocha-Jimenez, Daniela Gonzalez-Zarate, Tushar Pawar, Enrique Delgado-Alvarado, Jorge Alegria-Torres, Javier Vallejo-Montesinos
Summary: In this study, the effect of the side group of a series of silane coupling agents on the mechanical properties, crystallization kinetics, and degradation rate of TiO2 particles in the polypropylene matrix was investigated, along with the anchoring of an imidazole derivative. The results showed that 3-Glicydoxypropyltrimethoxysilane exhibited the best overall photostability, while 3-Chloropropyltrimethoxysilane promoted degradation of the polymer. Other silane coupling agents prevented the photocatalytic activity of anatase, thereby inhibiting degradation of the polymer matrix.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Chemistry, Multidisciplinary
Baku Nagendra, Andreas Leuteritz, E. Bhoje Gowd
Summary: Decorated multiwalled carbon nanotubes with layered double hydroxides as fillers can significantly improve the thermal stability and flame retardancy of isotactic polypropylene. The formation of a jammed network and effective char formation can restrict the transport of volatile compounds.
Article
Polymer Science
Yeyuan Hu, Yang Liao, Yanyan Zheng, Kosuke Ikeda, Ryoji Okabe, Ruifen Wu, Ryota Ozaki, Jun Xu, Qingyan Xu
Summary: The influence of cooling rate on the crystallization behavior of a semi-crystalline polypropylene was studied using the flash differential scanning calorimetry method. The results showed that as the cooling rate increases, the crystallization temperatures and crystallinity decrease.
Article
Polymer Science
Amulya K. Pervaje, Melissa A. Pasquinelli, Saad A. Khan, Erik E. Santiso
Summary: In this paper, a multiscale approach is presented to predict the mechanical properties of polypropylene fibers based on chemical and physical characteristics. The method relies on validation with experimental data and utilizes molecular simulations and neural network models to predict parameters for a chosen constitutive model.
Article
Polymer Science
Rita Salomone, Vito Speranza, Sara Liparoti, Giuseppe Titomanlio, Roberto Pantani
Summary: It is found that the two-step annealing significantly affects the morphology development of isotactic polypropylene injection-molded parts, particularly the size of spherulites. Additionally, annealing steps can reduce the thickness of the fibrillar skin layer.
Article
Polymer Science
Zhenxing Zhong, Zhaohui Su
Summary: In this study, the crystallization behavior of PB in its blends with iPP and aPP was systematically investigated using various experimental methods. It was found that iPP was more effective in promoting the formation of I' polymorph in the blends, while the cold crystallization rate of PB in the iPP blend with fully crystallized iPP was faster.
Article
Materials Science, Multidisciplinary
Daria Zielinska, Katarzyna Siwinska-Ciesielczyk, Karol Bula, Barbara Peplinska, Teofil Jesionowski, Slawomir Borysiak
Summary: Research was conducted on the design and preparation of advanced polymer biomaterials with innovative nanocellulose hybrid fillers, characterized by high mechanical strength, enhanced thermal resistance, and improved gas barrier properties, which are crucial in the packaging industry. These innovative polymer composite nanomaterials with renewable fillers can reduce the consumption of petroleum raw materials, leading to a reduction in energy consumption.
APPLIED MATERIALS TODAY
(2023)
Article
Polymer Science
Claudio De Rosa, Rocco Di Girolamo, Alessandra Cicolella, Giovanni Talarico, Miriam Scoti
Summary: Epitaxial crystallization can control the crystalline orientation of blocks, while using different crystalline substrates can define the final morphology. The polymer block that crystallizes first on the substrate has a significant impact on the final morphology of the block copolymers.
Article
Polymer Science
Hoorieh Barangizi, Andrzej Pawlak
Summary: This study investigated the crystallization process in a polymer composite with a limited density of macromolecular entanglements for the first time. It was found that if the composite has fewer macromolecular entanglements, the crystallization process proceeds faster or at a higher temperature. The crystallization in the nanocomposite was slowed down by the dispersed nanoparticles of aluminum oxide, hindering the movement of macromolecules to the growing crystals.
Article
Polymer Science
Federico Di Sacco, Eduardo Solano, Marc Malfois, Jingbo Wang, Markus Gahleitner, Roberto Pantani, Giuseppe Portale
Summary: Understanding the crystallization behavior of isotactic polypropylene during the cast film extrusion process is crucial for achieving desired material performances. Real-time X-ray characterization was performed for the first time ever, providing excellent quality data on the phase crystallinity evolution. Three crystallization zones were observed: an amorphous zone, a frostline zone, and a high-crystallinity zone. The experimental data was matched with simulated data, showing good agreement in terms of crystalline development over the investigated time scale.
Article
Thermodynamics
Qiunan Chen, Ting Sai, Zhengping Fang, Zhenghong Guo
Summary: The study successfully prepared C-60-decorated MMT hybrid by connecting fullerene to montmorillonite, and the resulting composites showed enhanced thermal stability and oxidative resistance in the PP matrix.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Pixiang Wang, Yifen Wang, Xueqi Wang, Yucheng Peng, Shaoyang Liu
Summary: The crystallization kinetics of isotactic homopolymer polypropylene (HPP), impact copolymer polypropylene (ICPP), and their composites were investigated. The Avrami-Jeziorny and Mo models accurately described the crystallization process. The nucleation activity and crystallization rate were influenced by the content of ICPP, with the highest rate observed at 60% ICPP. The changes in chain mobility and crystal-crystal interactions accounted for the fluctuations in crystallization rate and activation energy.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Biochemistry & Molecular Biology
Lixin Song, Weihan Chi, Qian Zhang, Jiannan Ren, Bing Yang, Fei Cong, Yongchao Li, Wei Wang, Xianliang Li, Yuanxia Wang
Summary: Epoxidized soybean oil (ESO) was used as a compatibilizer in blending polylactic acid (PLA) and polypropylene carbonate (PPC) resin. The addition of ESO improved the compatibility and mechanical properties of the blends, while excessive ESO decreased the compatibility and performance.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Biophysics
S. Scioli Montoto, M. L. Sbaraglini, A. Talevi, M. Couyoupetrou, M. Di Ianni, G. O. Pesce, V. A. Alvarez, L. E. Bruno-Blanch, G. R. Castro, M. E. Ruiz, G. A. Islan
COLLOIDS AND SURFACES B-BIOINTERFACES
(2018)
Article
Biophysics
M. L. Cacicedo, G. A. Islan, I. E. Leon, V. A. Alvarez, I Chourpa, E. Allard-Vannier, N. Garcia-Aranda, Z. Diaz-Riascose, Y. Fernandez, S. Schwartz, I Abasolo, G. R. Castro
COLLOIDS AND SURFACES B-BIOINTERFACES
(2018)
Article
Engineering, Environmental
Danila Merino, Tomy J. Gutierrez, Vera A. Alvarez
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2019)
Article
Spectroscopy
J. Pablo Tomba, Leonel I. Silva, Melisa Garcia Genga, Griselda Barrera Galland, C. Javier Perez
JOURNAL OF RAMAN SPECTROSCOPY
(2019)
Article
Biochemistry & Molecular Biology
Melina Erben, Adrian A. Perez, Carlos A. Osella, Vera A. Alvarez, Liliana G. Santiago
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2019)
Article
Pharmacology & Pharmacy
Natalia L. Caivo, Laura A. Svetaz, Vera A. Alvarez, Ariel D. Quiroga, Maria C. Lamas, Dario Leonardi
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2019)
Article
Pharmacology & Pharmacy
Juan M. Galdoporpora, Marina F. Morcillo, Angelina Ibar, Claudio J. Perez, Maria Tuttolomondo, Martin F. Desimone
CURRENT PHARMACEUTICAL DESIGN
(2019)
Article
Polymer Science
V. A. Alvarez, M. D. Failla, C. J. Perez
POLYMER DEGRADATION AND STABILITY
(2019)
Article
Infectious Diseases
Pablo Edmundo Antezana, Sofia Municoy, Claudio Javier Perez, Martin Federico Desimone
Summary: This study describes the development of a novel biomaterial - collagen hydrogels loaded with silver nanoparticles and cannabis sativa oil extract, which exhibits long-lasting antimicrobial effects, improved mechanical properties, and enhanced biocompatibility. The results suggest that this nanocomposite biomaterial is a promising alternative for the treatment of wound infections and wound healing.
Article
Polymer Science
Matias Menossi, Florencia Salcedo, Julieta Capiel, Margarita Adler, Vera A. Alvarez, Leandro N. Luduena
Summary: This study evaluates the influence of different relative humidities on the properties of thermoplastic starch films, compared to low-density polyethylene films. The results show that the thermoplastic starch films have inferior properties and negatively affect tomato germination.
JOURNAL OF POLYMER RESEARCH
(2022)
Article
Polymer Science
Luis M. Araque, Claudio J. Perez, Antonia Infantes-Molina, Enrique Rodriguez-Castellon, Guillermo J. Copello, Juan M. Lazaro-Martinez
Summary: Two responsive PEI hydrogels (P1.5E and P2E) with different cross-linking degrees were synthesized using a click reaction and without organic solvents. The hydrogel's swelling and rheological behavior were dependent on the cross-linking degree, and the hydrogels showed stimuli-responsive behavior to pH or ionic strength changes. The hydrogels also exhibited adsorption capacity for methyl orange (MO) dye and Cu2+ ions, with P1.5E showing higher sorption capacities. Germination experiments with lettuce seeds confirmed that the hydrogels did not release toxic molecules.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
M. P. Guaras, M. Menossi, A. Torres Nicolini, V. A. Alvarez, L. N. Luduena
Summary: The use of biodegradable polymers is an effective strategy in waste management and environmental care. In this study, bio-nanocomposites based on thermoplastic starch (TPS) were synthesized by reactive extrusion. Chemical modification of starch and incorporation of nanoclays were employed to reduce the disadvantages of TPS and improve its performance and cost ratio.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Guillermo Tejada, Natalia L. Calvo, Mauro Morri, Maximiliano Sortino, Celina Lamas, Vera A. Alvarez, Dario Leonardi
Summary: Oral candidiasis is an opportunistic infection mainly affecting individuals with weakened immune systems. This study aimed to develop buccal films loaded with lidocaine and miconazole nitrate to topically treat this pathology. The films showed adequate adhesiveness and thickness and provided a fast release of lidocaine and a controlled release of miconazole nitrate with antifungal activity for 24 hours, reducing the need for daily applications compared to conventional treatments.
Article
Polymer Science
Eliezer Velasquez, Cristian Patino Vidal, Guillermo Copello, Carol Lopez de Dicastillo, C. J. Perez, Abel Guarda, Maria Jose Galotto
Summary: This study determined the effect of incorporating fumed nanosilica on the processability improvement of post-consumer recycled flexible polypropylene. The addition of nanosilica increased the thermal stability and crystallinity of the polymer, improving the processability of the nanocomposites. However, it did not affect the crystallization and melting temperatures of the polymer.
Article
Pharmacology & Pharmacy
Natalia L. Calvo, Vera A. Alvarez, Maria C. Lamas, Dario Leonardi
JOURNAL OF PHARMACEUTICAL ANALYSIS
(2019)