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View article: Self-Nucleation Enables Polymorphic Selection in Thermoplastic Polyurethanes
Self-Nucleation Enables Polymorphic Selection in Thermoplastic Polyurethanes Open
This work investigates the self-nucleation behavior of thermoplastic polyurethanes (TPUs) with hard segment (HS) contents ranging from 29 to 80 wt %. Differential scanning calorimetry (DSC) reveals that upon cooling from the isotropic melt…
View article: Pasteurization-Triggered Heat-Resistant Enhancement of Packaging Films Derived from a Star-Shape Toughened Polylactide Stereocomplex
Pasteurization-Triggered Heat-Resistant Enhancement of Packaging Films Derived from a Star-Shape Toughened Polylactide Stereocomplex Open
A process for enhancing polylactide films' heat resistance, shape stability, and toughness has been developed. A star-shaped poly-(ε-caprolactone-b-d-lactide) (starPCL-b-PDLA) copolymer was synthesized by using a four-armed P…
View article: The Decisive Role of Confinement in Enhancing or Suppressing Self‐Nucleation in Polyethylene‐Containing Block Copolymers
The Decisive Role of Confinement in Enhancing or Suppressing Self‐Nucleation in Polyethylene‐Containing Block Copolymers Open
The influence of confinement on the self‐nucleation behavior of crystallizable polyethylene (PE) and poly(ethylene oxide) (PEO) blocks in block copolymers of different architectures is studied by differential scanning calorimetry. The amor…
View article: Cooling rate-dependent polymorphism in thermoplastic polyurethanes: effect of hard segments content
Cooling rate-dependent polymorphism in thermoplastic polyurethanes: effect of hard segments content Open
Thermoplastic polyurethanes (TPUs) are multi-block copolymers consisting of hard (HS) and soft segments (SS). The hard segment, based on 4,4′-methylenediphenyl diisocyanate and 1,4-butanediol (MDI/BD), crystallizes into two forms (Form I a…
View article: Lamellar thickness of the polypropylene matrix determines surface induced nucleation of polyethylene droplets in immiscible blends
Lamellar thickness of the polypropylene matrix determines surface induced nucleation of polyethylene droplets in immiscible blends Open
Polyethylene (PE)/polypropylene (PP) blends have attracted much attention since they offer interesting physical properties, including intriguing crystallization behaviour. When PE minority phase is dispersed as droplet in PP matrix, we hav…
View article: Control over Aspect Ratio and Polymer Spatial Distribution of 2D Platelets via Living Crystallization-Driven Self-Assembly
Control over Aspect Ratio and Polymer Spatial Distribution of 2D Platelets via Living Crystallization-Driven Self-Assembly Open
View article: Crystallization-Induced Self-Assembly of Poly(ethylene glycol) Side Chains in Dithiol–yne-Based Comb Polymers: Side Chain Spacing and Molecular Weight Effects
Crystallization-Induced Self-Assembly of Poly(ethylene glycol) Side Chains in Dithiol–yne-Based Comb Polymers: Side Chain Spacing and Molecular Weight Effects Open
The chain architecture and topology of macromolecules impact their physical properties and final performance, including their crystallization process. In this work, comb polymers constituted by poly(ethylene glycol), PEG, side chains, and …
View article: Polymer Physics behind the Gel‐Spinning of UHMWPE Fibers
Polymer Physics behind the Gel‐Spinning of UHMWPE Fibers Open
Gel‐spinning of ultra‐high molecular weight polyethylene (UHMWPE) fibers has attracted great interest in academia and industry since its birth and commercialization in the 1980s, due to unique properties such as high modulus, low density, …
View article: Origin of Melt Memory Effects in Poly(ethylene oxide): The Crucial Role of Entanglements
Origin of Melt Memory Effects in Poly(ethylene oxide): The Crucial Role of Entanglements Open
The melt memory effect on crystallization is an intriguing phenomenon displayed by semicrystalline polymers, as opposed to low molar mass molecules. It concerns the effect of melt temperature on nucleation upon recrystallization. Typically…
View article: Disappearance of Melt Memory Effect with Comonomer Incorporation in Isodimorphic Random Copolyesters
Disappearance of Melt Memory Effect with Comonomer Incorporation in Isodimorphic Random Copolyesters Open
Melt memory effects in polymer crystallization have attracted much attention in the past few years. Although progress has been made in understanding how the chemical structure of polymers can affect melt memory, there are still some knowle…
View article: Effect of Molecular Weight on the Crystallization and Melt Memory of Poly(ε-caprolactone) (PCL)
Effect of Molecular Weight on the Crystallization and Melt Memory of Poly(ε-caprolactone) (PCL) Open
The role of the molecular weight in the crystallization and melt memory of poly(ε-caprolactone) (PCL) was investigated. To this end, 10 PCL samples of synthetic and commercial origin and different chain ends, covering a number-average mole…
View article: Polymers and rheology: A tale of give and take
Polymers and rheology: A tale of give and take Open
Polymers and rheology were both born in the twenties of the last century, fruit of the disruptive and creative scientific atmosphere of this decade. The development of polymer science and technology in the last almost 100 years has been co…
View article: CCDC 2166582: Experimental Crystal Structure Determination
CCDC 2166582: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2166583: Experimental Crystal Structure Determination
CCDC 2166583: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2166584: Experimental Crystal Structure Determination
CCDC 2166584: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Lactide-Valerolactone Copolymers for Packaging Applications
Lactide-Valerolactone Copolymers for Packaging Applications Open
Lactide-valerolactone copolymers have potential application in the packaging sector. Different copolymers were synthesized, and the kinetics of the copolymerization reactions and the microstructure of the copolymers were analysed. Lactide …
View article: Rheology of Polymer Processing in Spain (1995–2020)
Rheology of Polymer Processing in Spain (1995–2020) Open
The contribution of Spanish scientists to the rheology involved in polymer processing during the last 25 years is investigated. It is shown that the performed research covers, at different levels, all industrial polymeric materials: thermo…
View article: Matching Rheology, Conductivity and Joule Effect in PU/CNT Nanocomposites
Matching Rheology, Conductivity and Joule Effect in PU/CNT Nanocomposites Open
We investigated polyurethane (PU)–carbon nanotube (CNT) nanocomposites (PU/CNT) in a range of concentrations from 1 to 8 wt% CNT as hot melt adhesives. We studied the thermal properties of the nanocomposites, which is relevant from an appl…
View article: Fractionated crystallization in semicrystalline polymers
Fractionated crystallization in semicrystalline polymers Open
The crystallization of heterogeneously nucleated bulk polymers typically occurs in a single exothermic process, within a narrow temperature range, i.e., a single exothermic peak is detected by differential scanning calorimetry when the mat…
View article: Melt Memory Effects in Poly(butylene succinate) Studied by Differential Fast Scanning Calorimetry
Melt Memory Effects in Poly(butylene succinate) Studied by Differential Fast Scanning Calorimetry Open
It is widely accepted that melt memory effect on polymer crystallization depends on thermal history of the material, however a systematic study of the different parameters involved in the process has been neglected, so far. In this work, p…
View article: Chemical Structure Drives Memory Effects in the Crystallization of Homopolymers
Chemical Structure Drives Memory Effects in the Crystallization of Homopolymers Open
Although the study of melt memory has attracted much interest, the effect of polymer chemical structure on its origin has not been fully elucidated. In this work, we study the melt memory effects by differential scanning calorimetry employ…
View article: Lactide-caprolactone copolymers with tuneable barrier properties for packaging applications
Lactide-caprolactone copolymers with tuneable barrier properties for packaging applications Open
Lactide-caprolactone copolymers have been synthetized employing two metallic catalysts, Ph3Bi and SnOct2. The analysis of the microstructure by NMR reveals that gradient like copolymers are obtained with SnOct2 catalyst, whereas for Ph3Bi …
View article: Self-Nucleation Effects on Polymer Crystallization
Self-Nucleation Effects on Polymer Crystallization Open
The existence of a "memory"of the previous crystalline state, which survives melting and enhances recrystallization kinetics by a self-nucleation process, is well-known in polymer crystallization studies. Despite being extensively investig…
View article: Effect of shear rate and pressure on the crystallization of PP nanocomposites and PP/PET polymer blend nanocomposites
Effect of shear rate and pressure on the crystallization of PP nanocomposites and PP/PET polymer blend nanocomposites Open
View article: Elaboration and Characterization of Conductive Polymer Nanocomposites with Potential Use as Electrically Driven Membranes
Elaboration and Characterization of Conductive Polymer Nanocomposites with Potential Use as Electrically Driven Membranes Open
In this work, a general, facile, and relatively low-cost method to produce electrically driven non-porous membranes by revalorization of recycled polyolefins is proposed. The polymer matrices are poly(propylene) (PP) and poly(ethylene) (PE…
View article: Improving the barrier properties of a biodegradable polyester for packaging applications
Improving the barrier properties of a biodegradable polyester for packaging applications Open
Miscible and thermally stable blends of biodegradable poly(butylene adipate-co-terephthalate) (PBAT) with poly(hydroxy ether of bisphenol A) (PH) are investigated to obtain membranes for packaging applications. Previously the miscibility a…
View article: Blends of biodegradable poly(butylene adipate-co-terephthalate) with poly(hydroxi amino ether) for packaging applications: Miscibility, rheology and transport properties
Blends of biodegradable poly(butylene adipate-co-terephthalate) with poly(hydroxi amino ether) for packaging applications: Miscibility, rheology and transport properties Open
The improvement of the properties of biodegradable poly(butylene adipate-co-terephthalate) (PBAT) through the addition of poly(hydroxi amino ether) (PHAE) is investigated. Analysis by means of DSC, DMTA, FTIR and TEM reveals that blends ar…
View article: Polipropileno/poliamida nahasteen konpatibilizazioa: azterketa morfologiko eta erreologikoa
Polipropileno/poliamida nahasteen konpatibilizazioa: azterketa morfologiko eta erreologikoa Open
Polipropileno/Poliamida (PP/PA) nahasteak prestatu dira eta kopolimero- konpatibilizatzailea eta nanosilika gehitzeak nahaste horietan duen eragina aztertu da. Azterketa mikroskopikoak erakusten duenez, nahasteek emultsio antzeko morfologi…