Shape memory properties of polymers represent one the most expanding fields in polymer science related to numerous smart applications. Recently, multiple-shape (multiple-SMPs) have attracted significant attention and can be achieved with complex architectures. Here, miscible PLLA/PMMA blends broad glass transitions are investigated as an alternative platform design multiple-SMPs. Dual-shape experiments were first conducted at different stretching temperatures identify so-called "temperature...

Stereocomplexable polylactides (PLAs) with improved processability and thermomechanical properties have been prepared by one-step melt blending of high-molecular-weight poly(l-lactide) (PLLA), poly(d-lactide) (PDLA), poly(methyl methacrylate) (PMMA). Crystallization PLA stereocomplexes occurred during cooling from the melt, and, surprisingly, PMMA enhanced amount stereocomplex formation, especially addition 30-40 % PMMA. The ternary blends were found to be miscible, such miscibility is...

Despite attractive properties of cellulose nanocrystals (CNCs) such as high natural abundance, inherent biodegradability and modulus, CNCs tend to degrade aggregate when exposed temperatures during melt processing. In the present work, surface was modified with PMMA take advantage miscibility various biobased polymers including PLLA melt-blended. Particular attention paid grafting techniques in water medium using two different redox initiators: Fe2+/H2O2 (Fenton's reagent) ceric ammonium...

A green manufacturing technique, reactive extrusion (REx), was employed to improve the mechanical properties of polylactide (PLA). To achieve this goal, a fully biosourced PLA based polymer blend conceived by incorporating small quantities poly(ω-hydroxytetradecanoic acid) (PC14). PLA/PC14 blends were compatibilized transesterification reactions promoted 200 ppm titanium tetrabutoxide (Ti(OBu)4) during REx. REx for 15 min at 150 rpm and °C resulted in enhanced while minimizing losses...

ABSTRACT Technical renewable poly( l ‐lactide) (PLA)‐based blends represent an elegant way to achieve attractive properties for engineering applications. Recently, the miscibility between PLA and poly(methyl methacrylate) (PMMA) gave rise new formulations with enhanced thermo‐mechanical but their high brittleness still remains a challenge be overcome. This work here focuses on rubber‐toughened PLA/PMMA injection‐molding processes upon addition of commercially available ethylene‐acrylate...

Commercial polylactide (PLA) was converted and endowed with shape-memory properties by synthesizing ionic hybrids based on blends of PLA imidazolium-terminated poly[ε-caprolactone-co-d,l-lactide] (P[CL-co-LA]) surface-modified silica nanoparticles. The electrostatic interactions assist the nanoparticle dispersion in polymer matrix. Since polymers is a perennial challenge has prevented nanocomposites from reaching their full potential terms performance we expect this new design will be...

Low amounts of PMMA induce the polar crystalline phase PVDF in a melt-state extrusion–calendering process and enhance ferroelectric properties.

Shear piezoelectric properties of uniaxially stretched poly(l-lactide) (US-PLA) films manufactured by an industrially relevant technique (i.e., extrusion–orientation without poling) are investigated, and specific insight on the process–structure–properties relationships is provided. Two commercially available PLA grades with d-isomer content between 2 4% selected. The shear coefficient d14 US-PLA tends to increase draw ratio applied during orientation stage, a maximal 5.9 pC/N reported....

A critical share rate exists, above which the droplet/fibril transition occurs during injection moulding process. The elasticity ratio controls morphology formation as well viscosity and interfacial tension.

Polyaniline (PAni)-based sensors are a promising solution for ammonia (NH

In this article, the authors present a porous copolymer film with pseudo‐piezoelectric effects as new candidate material for sensing applications. Porous films of poly(ethylene‐ co ‐vinyl acetate) (EVA) thicknesses ranging from 160 to 310 μm are fabricated by coextrusion chemical foaming process and charged using high‐voltage contact charging process. Output performances (piezoelectric constant relative permittivity) related thermal/mechanical stability specifically studied function porosity...

Poly(methyl methacrylate-co-methacrylic acid) (PMMA-co-MAA) copolymer containing ionizable moieties is here investigated as a melt processing additive for poly(vinylidene difluoride) (PVDF) to develop high-quality ferro- and piezoelectric polymer films by extrusion-calendering. The PVDF/PMMA-co-MAA miscibility the β-phase crystallization from state at high cooling rates were first explored flash differential scanning calorimetry (FDSC). Transposition melt-processing of thin...

This paper investigates energy harvesting performances of porous piezoelectric polymer films to collect electrical from vibrations and power various sensors. The influence void content on the elastic matrix, dielectric, electrical, mechanical properties produced available commercial poly(ethylene-co-vinyl acetate) using an industrially applicable melt-state extrusion method (EVA) were examined discussed. Electrical characterization showed increase in harvested current a decrease Young’s...

Blends of poly(ethylene oxide) (PEO) with poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) were investigated for the preparation electrically conductive films using melt-state extrusion processing techniques. High molecular weight PEO is selected as a melting carrier to enable PEDOT:PSS. A drop-casting technique from aqueous solutions first produce model PEO/PEDOT:PSS blends and identify influence relevant parameters on final electronic conductivity. low percolation...

Increasing energy autonomy and lowering dependence on lithium-based batteries are more appealing to meet our current future needs of energy-demanding applications such as data acquisition, storage, communication. In this respect, harvesting solutions from ambient sources represent a relevant solution by unravelling these challenges giving access an unlimited source portable/renewable energy. Despite than five decades intensive study, most exclusively designed ferroelectric ceramics...

Biodiesel replaced imported oils as an ecologically beneficial alternative which may replace diesel depending on crop and oil costs. Tobacco seed is trans-esterified using a heterogeneous base catalyst to produce biodiesel in this study examine the mechanical properties emission performance characteristics single-cylinder Kirloskar engine. Several biofuel/diesel blends were tested, their effects efficiency examined under varying loads at constant rotational speed of 1500 rpm. The engine's...

Highly biobased poly(butylene succinate-co-terephthalate) (PBST) with processing temperatures close to those of commodity polymers (160-180 °C) and long-chain branched architectures (LCB) are synthesized by different strategies.Their rheological properties investigated, in particular their melt strength properties.A two-step synthesis route is first proposed based on linear LCBs produced polycondensation followed reactive extrusion an epoxy-based multifunctional agent Joncryl ® at...

Abstract Poly(lactide) (PLA) is an eco-friendly and low-cost polymer with a shear piezoelectricity easily induced by uniaxial stretching without poling process. These interesting features make PLA as good candidate to replace the widely-used poly(vinylidene difluoride) (PVDF) piezoelectric polymer, in particular for flexible energy harvesting applications aiming power wearable sensors. In this work, films were fabricated simple extrusion–orientation The efficiency of characterized using...

ABSTRACT The melt compatibility between poly(L‐lactide) (PLA) and polyamides (PAs) with related thermomechanical properties is addressed. A particular attention paid to four commercial PAs extrusion processing temperatures close PLA (PA10‐10 PA12). PLA/PA blend morphologies without a compatibilizer are first revealed by scanning electron microscopy. PA12 displays the best droplet dispersion into ( D n 700 nm), whereas poor interfacial adhesion attested for PLA/PA10‐10 blends. Interfacial...

Engineering properties of partially-biobased poly(L-Lactide)/poly(amide-12) (PLA/PA12) blends are here addressed using a functional compatibilizer, namely poly(L-Lactide) grafted maleic anhydride (PLA-g-MA). PLA/PA12 with compatibilizers processed twin-screw extrusion and the amount PLA-g-PMA is optimized respect to final blend such as ductility, impact toughness, thermal resistance. Blend morphologies depict enhanced PA12 dispersion into PLA-g-MA strong interfacial adhesion, in accordance...