Abstract Nanostructured thermosetting materials based on matrices were prepared by modification of an epoxy system with linear PS‐ block ‐PB copolymers. The nanostructured thermosets obtained through PS segregation. Depending the block‐copolymer content in and its epoxidation degree, domains can display micellar, worm‐like or hexagonally‐packed cylinder structures, retaining stiffness matrix, where hexagonally cylindrical morphology lead to a significant increase fracture toughness....

Novel nanostructured thermosetting materials have been prepared by modification of an epoxy resin with a semifluorinated diblock copolymer, poly(heptadecafluorodecyl acrylate)-b-poly(caprolactone), PaF-b-PCL. In first step, the phase behavior and linear viscoelasticity PaF-b-PCL were investigated. According to segregation regime, no order−order transitions detected, being order−disorder transition temperature beyond degradation temperature. Atomic force microscopy (AFM) images block...

Recently we reported the critical content threshold of epoxidized polybutadiene (PBep) units to induce total miscibility between poly(styrene-b-butadiene) (SB) block copolymers (BC) and uncured epoxy resin.(20) In this work investigate different mechanisms involved through morphology development, depending on in initial mixture. PBep contents higher than, close below, or far below lead long-range order nanostructures reaction-induced microphase separation (RIMS) PS block, a combination both...

The oleaginous yeast Yarrowia lipolytica is an organism of choice for the tailored production various compounds such as biofuels or biopolymers. When properly engineered, it capable producing medium-chain-length polyhydroxyalkanoate (mcl-PHA), a biobased and biodegradable polymer that can be used bioplastics biopolymers environmental biomedical applications. This study describes bioproduction main properties two different mcl-PHA polymers. We generated by metabolic engineering, strains Y....

Furandicarboxylate-based polyesters are considered an interesting class of bio-based polymers due to their improved properties with respect the petrol-based terephthalate homologs. An in-depth analysis crystal structure poly(propylene 2,5-furandicarboxylate) (PPF), after maximum possible removal catalyst, was carried out. The study disclosed that purified PPF presents two different crystalline phases crystallization from melt. Crystallizations at temperatures lower than 120 °C lead growth a...

Polyhydroxyurethanes (PHU), obtained from CO2-based cyclic carbonates (CC) and polyamines, are known as greener safer alternatives to conventional polyurethanes. Interestingly, the hydroxyurethane moieties present along PHU's backbone offer unexplored opportunities in terms of enhanced adhesion mechanical properties that could be a major breakthrough many structural applications. Furthermore, PHUs have shown thermomechanical recyclability arising ability participate reversible exchange...

We report an approach for the design of nanostructured thermoplastic elastomeric materials consisting poly(styrene-b-butadiene-b-styrene) and epoxy. This consists in epoxidation PB block further mixing with low contents DGEBA:MCDEA system. Morphological behavior as well thermal mechanical properties have been investigated. The modification epoxidized SBS 10, 20, 30 wt % epoxy system induces microphase separation at nanoscale from a poorly to well-ordered self-assembled morphology where shape...

We investigate the scope of organocatalyzed step-growth copolymerization CO2-sourced exovinylene bicyclic carbonates with bio-based diols into polycarbonates. A series regioregular poly(oxo-carbonate)s were prepared from sugar- (1,4-butanediol and isosorbide) or lignin-derived (1,4-benzenedimethanol 1,4-cyclohexanediol) at 25 °C 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as a catalyst, their defect-free structure was confirmed by nuclear magnetic resonance spectroscopy studies. Their...

Incorporating biobased nanofillers including cellulose nanocrystals (CNCs) and chitin (ChNCs) into nonisocyanate polyurethane (NIPU) offers a multifunctional approach to improving mechanical thermal properties while promoting sustainability green chemistry. Nanocomposites of segmented thermoplastic polyhydroxyurethane (PHU) from vanillyl alcohol bis(cyclocarbonate) (VABC), poly(tetramethylene oxide) diamine (PTMODA), bis(aminomethyl) norbornane (NORB) reinforced with low amount CNCs...

Abstract BACKGROUND: The goal of this work was to establish the minimum degree epoxidation needed develop nanostructured epoxy systems by modification with poly(styrene‐ block ‐butadiene‐ ‐styrene) (SBS) triblock copolymers epoxidized several degrees, and also investigate effect polystyrene (PS) content on final morphologies. By using two SBS copolymers, influence weight ratio blocks generated morphologies mechanical properties analysed. RESULTS: Nanostructured thermosets were effectively...

We herein propose capitalizing on strong hydrogen bonding from novel bio-CO2-derived dynamic thermosets to achieve high-performance natural fiber composites (NFC) with circular features. CO2- and biomass-derived polyhydroxyurethane (PHU) were selected, for the first time of our knowledge, as matrices their ability make H-bond, resulting in outstanding mechanical properties NFC. Exploiting this H-bond key feature, exceptional interface between flax PHU was confirmed by atomic force microscopy...

The layer-by-layer technique has been widely adopted for the fabrication of nanostructures with tailored properties. In this work, photoactive multilayer films consisting alternating layers chitosan and an azopolymer were developed by method. Taking into account that pH is factor controlling charge weak polyelectrolytes, influence parameter on structure properties was evaluated. Thus, different prepared varying conditions as well bilayer number. morphology analyzed diverse advanced...

Double crystalline multiblock copolymers exhibit two well-defined melting temperatures associated with the phases formed by their constituent blocks. The superstructure in these is complex and depends on miscibility of both comonomers. In this work, an innovative series double poly(ethylene terephthalate)-mb-poly(oxyhexane) were prepared one pot. Previously synthesized low molecular weight poly(oxyhexane)telechelic diol terephthalate) (PET) oligomers reacted transesterification using organic...

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...

Boron-catalyzed polymerization offers unique C3-polymer structures because, in contrast to 1,4-polydienes, each double bond is separated by only one methylene group. However, the geometrical regularity of such C3-structures was less discussed, and their properties have not been reported. In this work, well-defined poly(2-methyl-propenylene)s with different molecular weights are prepared gram scale boron-catalyzed 2-methylallyl arsonium ylide. 1H NMR, 13H two-dimensional 1H–13C heteronuclear...

In this work, we prepare and characterize multiphasic thin films containing poly(ε-caprolactone), PCL, poly(butylene succinate), PBS, a poly (butylene succinate-ran-ϵ-caprolactone) (PBS-ran-PCL) random copolyester. To that aim, were prepared by sequential dipping of silicon substrate into chloroform solutions the respective polymers. The preparation method resulted in with varying compositions PCL PBS components depending on initial concentration number steps employed for samples. Atomic...

Conductive properties of different thermosetting materials modified with nematic 4'-(hexyl)-4-biphenyl-carbonitrile (HBC) liquid crystal and rutile TiO(2) nanoparticles were successfully studied by means tunneling atomic force miscroscopy (TUNA). Taking into account the state HBC at room temperature, depending on both content presence nanoparticles, designed showed TUNA currents passed through sample. The addition systems multiply detected current if compared to without simultaneously...