A5062929888- Polymer crystallization and properties
- biodegradable polymer synthesis and properties
- Polymer Nanocomposites and Properties
- Polymer composites and self-healing
- Rheology and Fluid Dynamics Studies
- Microplastics and Plastic Pollution
- Crystallization and Solubility Studies
- Carbon Nanotubes in Composites
- X-ray Diffraction in Crystallography
- Fuel Cells and Related Materials
- Nanocomposite Films for Food Packaging
- Fiber-reinforced polymer composites
- Synthesis and properties of polymers
- Block Copolymer Self-Assembly
- Advanced Polymer Synthesis and Characterization
- Polymer Foaming and Composites
- Silicone and Siloxane Chemistry
- Tribology and Wear Analysis
- Advertising and Communication Studies
- Sustainable Design and Development
- Bone Tissue Engineering Materials
- Oxidative Organic Chemistry Reactions
- Recycling and Waste Management Techniques
- Additive Manufacturing and 3D Printing Technologies
- Injection Molding Process and Properties
University of the Basque Country
2016-2025
University of Genoa
2024
University of Minnesota
2022-2024
Polymat
2015-2021
The existence of a "memory" the previous crystalline state, which survives melting and enhances recrystallization kinetics by self-nucleation process, is well-known in polymer crystallization studies. Despite being extensively investigated, since early days studies, complete understanding melt memory effects still lacking. In particular, exact constitution self-nuclei under debate. this Perspective, we provide comprehensive critical overview crystallization. After phenomenology process some...
The role of the molecular weight in crystallization and melt memory poly(ε-caprolactone) (PCL) was investigated. To this end, 10 PCL samples synthetic commercial origin different chain ends, covering a number-average (Mn) range between 0.48 70.5 kg/mol, were analyzed. Polarized light optical microscopy, differential scanning calorimetry, small-angle X-ray scattering (SAXS) employed for in-depth characterization. thermal transitions, morphology, kinetics, structural parameters, effects...
The crystallization of heterogeneously nucleated bulk polymers typically occurs in a single exothermic process, within narrow temperature range, i.e., peak is detected by differential scanning calorimetry when the material cooled from melt. However, semicrystalline polymer subdivided or dispersed into multitude totally (or partially) isolated microdomains (e.g., droplets cylinders), number comparable to that commonly available nucleating heterogeneities, several separated events are...
Polymers and rheology were both born in the twenties of last century, fruit disruptive creative scientific atmosphere this decade. The development polymer science technology almost 100 years has been colossal, whereas able to create its own route as a branch Physics. In review paper we describe interactions between areas, demonstrating that many crucial aspects for progress one them owes contribution other viceversa. This interrelationship is shown through historical survey principal...
Abstract The melt memory effect on crystallization is an intriguing phenomenon displayed by semicrystalline polymers, as opposed to low molar mass molecules. It concerns the of temperature nucleation upon recrystallization. Typically, polymer crystals must be considerably superheated erase previous morphology subsequent crystallization, avoiding acceleration process. Despite being known for decades, its origin still not fully understood. Investigating model poly(ethylene oxide) covering a...
Melt memory effects on polymer crystallization are commonly reported in the literature, even when they not completely understood. In particular, exact nature of melt heterogeneities that cause an enhanced nucleation (i.e., "self-nuclei") is unknown. This partly due to sensitivity limitations experimental techniques employed study memory. this work, effect semicrystalline polymers studied for first time by dielectric measurements. Polycaprolactones two different molecular weights have been...
A novel approach to study self-nucleation in semicrystalline polymers is presented. Self-nucleation, i.e., the peculiar increase of recrystallization kinetics associated with a range melting temperatures above or below point, investigated parallel differential scanning calorimetry (DSC) and rheological measurements, for series metallocene propene/ethylene random copolymers varying comonomer content. DSC experiments revealed exact temperature region where effects are detected various samples,...
Although the study of melt memory has attracted much interest, effect polymer chemical structure on its origin not been fully elucidated. In this work, we effects by differential scanning calorimetry employing a self-nucleation protocol. We use homologous series homopolymers containing different polar groups and number methylene in their repeating units: polycarbonate, polyesters, polyethers, polyamides. show that is generally controlled strength intermolecular interactions. The...
The origin of melt memory effects associated with semicrystalline polymers and the physical parameters involved in this process have been widely studied literature. However, a comprehensive understanding role intermolecular interactions on is still being developed. For purpose, we considered aliphatic polyesters incorporated amide additional ester groups. Inserting these functional groups, strength increases widening effect. Not only presence groups but also position repeating unit plays...
Melt memory effects in polymer crystallization have attracted much attention the past few years. Although progress has been made understanding how chemical structure of polymers can affect melt memory, there are still some knowledge gaps. In this work, we study incorporating a second comonomer unit that is partially included crystalline cell affects effect major component random isodimorphic copolymer for first time. This depresses melting temperature homopolymer, reduces crystallinity, and...
ABSTRACT Physical features of polyethylene terephthalate (PET)/low density (LDPE) immiscible blends, rich in PET, with and without titanium dioxide (TiO 2 ) nanoparticles are studied. These materials industrial interest, because they can be obtained by recycling PET bottles containing TiO their corresponding made caps. Their potential application packaging is investigated. Droplet‐matrix morphology observed scanning electron microscopy; coalescence occurs during compression molding....
The number of methylene groups between strongly interacting functional within polymer repeating units induces even-odd effects on thermal and mechanical properties. However, detailed studies correlating the effect with structural changes are still lacking. In this work, we establish correlations structure properties poly(ester amide)s containing long alkyl chain lengths. impacts properties, including melting temperature crystallinity degree. It influences spherulitic morphology amide)s,...
The effectiveness of hydrophobically modified nanosilica (NS) as interfacial modifying agent for immiscible polymer blends is evaluated. Blends polypropylene (PP) with 20% polyamide 6 (PA) and 5% hydrophobic NS were prepared by melt mixing. Compression molded sheets extruded films evaluated scanning electron microscopy, transmission tensile testing, rheological measurements. Hydrophobic particles strongly reduce the polydispersity droplet size dispersed phase, a result their preferential...
It is widely accepted that melt memory effect on polymer crystallization depends thermal history of the material, however a systematic study different parameters involved in process has been neglected, so far. In this work, poly(butylene succinate) selected to analyze short times and high cooling/heating rates are relevant from an industrial point view by taking advantage fast scanning calorimetry (FSC). The FSC experiments reveal width temperature range reduced with time spent at...