A5077854120- biodegradable polymer synthesis and properties
- Polymer crystallization and properties
- Polymer Nanocomposites and Properties
- Polymer composites and self-healing
- Microplastics and Plastic Pollution
- Carbon dioxide utilization in catalysis
- Advanced Polymer Synthesis and Characterization
- Carbon Nanotubes in Composites
- Lignin and Wood Chemistry
- Additive Manufacturing and 3D Printing Technologies
- Nanocomposite Films for Food Packaging
- Chemistry and Chemical Engineering
- Epoxy Resin Curing Processes
- Photochromic and Fluorescence Chemistry
- Thermal and Kinetic Analysis
- Polymer Foaming and Composites
- Graphene and Nanomaterials Applications
- Crystallization and Solubility Studies
- Natural Fiber Reinforced Composites
- Fuel Cells and Related Materials
- Graphene research and applications
- Thermal properties of materials
- Chemical and Environmental Engineering Research
University of the Basque Country
2015-2025
Polymat
2015-2024
Beijing National Laboratory for Molecular Sciences
2020-2023
Chinese Academy of Sciences
2020-2023
Institute of Chemistry
2020-2023
Instituto de Ciência e Tecnologia de Polímeros
2016
Simón Bolívar University
2015
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...
Poly(butylene succinate-ran-butylene adipate) random copolymers (PBSA) were prepared by melt polycondensation in a wide composition range. Polarized light optical microscopy (PLOM) was employed to observe their superstructural morphology while thermal and structural properties studied differential scanning calorimetry (DSC) situ synchrotron X-ray diffraction at small angles (WAXS SAXS). The morphological study revealed negative spherulitic superstructures with (PBS-rich) without (PBA-rich)...
We have characterized a series of aliphatic polycarbonates synthesized by organocatalysis containing variable number methylene groups (nCH2) in their repeating units ranging from nCH2 = 6 to 12. The melting and crystallization behavior, crystalline structures were studied differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), wide-angle X-ray scattering (WAXS). found clear even–odd effect terms thermal properties structure, for 9, saturation the effect, 10...
Poly(ε-caprolactone)-grafted-lignin (PCL-g-lignin) copolymers with 2 to 37 wt % lignin are employed study the effect of on morphology, nucleation, and crystallization kinetics PCL. Lignin displays a nucleating action PCL chains originating an intersecting lamellar morphology. is excellent agent for at low contents (2–5 %) nucleation efficiency values that close or >100%. This increases melting temperature under nonisothermal conditions accelerates overall isothermal rate At >18 %,...
We previously showed that nanoparticles (NPs) could be ordered into structures by using the growth rate of polymer crystals as control variable. In particular, for slow enough spherulitic fronts, NPs grafted with amorphous chains are selectively moved interlamellar, interfibrillar, and interspherulitic zones a lamellar morphology, specifically going from interlamellar to progressively decreasing crystal rates. Here, we examine effect NP grafting density on crystallization kinetics. find...
Random copolymerization is used to prepare new polymeric materials that combine the desirable properties of different homopolymers. The covalent bonds between comonomers enable miscibility and formation random copolymers with specific tailored for various applications. crystallization behavior intricate, encompassing up three modes, i.e., total comonomeric exclusion, isomorphism, isodimorphism. Isomorphism isodimorphism allow across entire composition range, resulting in unique potentially...
The ring opening polymerization of cyclic butylene terephthalate into poly (butylene terephthalate) (pCBT) in the presence reduced graphene oxide (RGO) is an effective method for preparation polymer nanocomposites. inclusion RGO nanoflakes dramatically affects crystallization pCBT, shifting peak temperature to higher temperatures and, overall, increasing rate. This was due a super nucleating effect caused by RGO, which maximized highly oxide. Furthermore, combined analyses differential...
Successive Self-nucleation and Annealing (SSA) is a thermal fractionation technique that performed by Differential Scanning Calorimetry (DSC). The combination of non-isothermal isothermal steps applied during SSA achieves efficient molecular segregation polymer crystallization. Such magnifies the effect defects in chain crystallization, thereby providing information on structure. was created implemented Müller co-workers 1997, becoming powerful resource for studying ethylene/ α -olefin...
A series of aliphatic polyethers with different chain lengths (nCH2 = 6 to 12 and 16) is studied employing differential scanning calorimetry X-rays scattering. The calorimetric structural behavior samples crystallized from the melt divided into odd–even saturation regions. In region 10), odd 7 9) show enhanced properties (e.g., higher transition temperatures) faster crystallization kinetics than even ones 6, 8, 10). crystallize in orthorhombic unit cells monoclinic cells. 11 16), increase as...
Abstract By using a commercial fast‐scan chip‐calorimeter, the effect of molecular weight on isothermal crystallization rates linear and cyclic poly(epsilon‐caprolactone) samples (L‐ PCLs C‐ ) is investigated. The results confirm non‐monotonic dependence both L‐ over wide temperature range, previously observed only in high which medium exhibit highest rate. Chain‐end effects PCL with weights induce faster specific low regions, comparison to that for counterpart . This phenomenon no longer...
C-PCL/L-PCL blends show a synergistic decrease in their isothermal crystallization rates as compared to the expectation of simple mixing law due threading effect linear on cyclic chains.
ABSTRACT The structure and thermal properties of linear low‐density polyethylene (LLDPE)/medium soft paraffin wax blends, prepared by melt mixing, were investigated differential scanning calorimetry (DSC) small‐ wide‐angle X‐ray scattering (SAXS WAXS). blends form a single phase in the as determined SAXS. Upon cooling from melt, two crystalline phases develop for with more than 10 wt % characterized widely different melting points. acts an effective plasticizer LLDPE, decreasing both its...
Biomedical applications of polymers require precise control the solid-state structure, which is particular interest for biodegradable copolymers. In this work, we evaluated influence crystallization conditions on comonomer exclusion/inclusion balance poly(butylene succinate-ran-butylene adipate) (PBSA) isodimorphic random Regardless conditions, copolymers retain their character, displaying a pseudo-eutectic behavior with in entire composition range. This illustrates thermodynamic nature PBSA...
In this study, nanocomposites were prepared by melt blending poly (ε-caprolactone) (PCL) with a (polycarbonate (PC)/multi-wall carbon nanotubes (MWCNTs)) masterbatch in twin-screw extruder. The contained 0.5, 1.0, 2.0, and 4.0 wt % MWCNTs. Even though PCL PC have been reported to be miscible, our DSC (Differential Scanning Calorimetry), SAXS (Small Angle X-ray Scattering), WAXS (Wide Scattering) results showed partial miscibility, where two phases formed (PC-rich PCL-rich phases). the...