Plastics have become indispensable in modern life and the material of choice packaging applications, but they also caused increasing plastic waste accumulation oceans landfills. Although there been continuous efforts to develop biodegradable plastics, mechanical and/or transport properties these materials still need be significantly improved suitable for replacing conventional materials. Here we report a class biorenewable degradable based on copolymers γ-butyrolactone its ring-fused...

Stereo-defects present in stereo-regular polymers often diminish thermal and mechanical properties, hence suppressing or eliminating them is a major aspirational goal for achieving with optimal enhanced properties. Here, we accomplish the opposite by introducing controlled stereo-defects to semicrystalline biodegradable poly(3-hydroxybutyrate) (P3HB), which offers an attractive alternative isotactic polypropylene but brittle opaque. We enhance specific properties performance of P3HB...

The effects of the crystallinity and polymorphism PLLA PDLA–PLLA 50:50 blends on free volume transport properties have been studied. In case increase promotes a process densification reduction in fraction rigid amorphous (RAF), contrary to which enlargement led dedensification. This result offers unique opportunity analyze separately opposite influence crystallization associated with RAF. Overall, these findings provide better understanding relationship between would explain also...

ABSTRACT The effectiveness of tributyl citrate (TbC) as a plasticizer for polylactide and polyhydroxybutyrate was analysed in order to improve the ductility these polymers make them good candidates food packaging applications. Although thermal mechanical properties have been widely studied literature, effect on free volume transport has not deeply analysed. characterized using positron annihilation lifetime spectroscopy observing its linear increase with TbC content. permeability water...

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...

Poly(hydroxy acids) derived from the self-condensation of hydroxy acid are biodegradable and can be fully recycled in a Circular Economy approach.

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....

Within the large poly(3-hydroxyalkanoate) (PHA) family, C3 propionates are much less studied than C4 butyrates, with exception of α,α-disubstituted propionate PHAs, particularly poly(3-hydroxy-2,2-dimethylpropionate), P3H(Me)2P, due to its high melting temperature (Tm ∼ 230 °C) and crystallinity (∼76%). However, inefficient synthetic routes monomer 2,2-dimethylpropiolactone [(Me)2PL] extreme brittleness P3H(Me)2P largely hinder broad applications. Here, we introduce simple, efficient...

ABSTRACT In order to make poly(lactide) (PLA) suitable for food packaging applications, its toughness must be improved. this work, the plasticization effectiveness of a low‐molecular‐weight plasticizer and triblock copolymer are analyzed. For purpose, PLA is blended with poly(ethylene glycol) (PEG) poly(lactide‐ethylene glycol‐lactide) (LA‐EG‐LA) copolymer. The obtained results show that copolymers more effective, reducing glass transition temperature PLA. Although PLA/PEG blends have been...

The improvement of the barrier character polylactide by addition poly(hydroxy ether) bisphenol A (Phenoxy) and poly(lactide-co-ɛ-caprolactone) copolymer that acts as a compatibilizer is studied. First, differential scanning calorimetry, Fourier transformed infrared spectroscopy, electron microscopy show allows to obtain miscible ternary system. permeability water vapor, oxygen, carbon dioxide enhanced with phenoxy but better in its obtained compatibilizer. effects different factors such...

ABSTRACT In this work, the barrier character of poly(caprolactone) is improved with addition a poly(hydroxy amino ether). The analysis by means thermal, thermomechanical, and morphology characterization reveals that blends are partially miscible. has revealed show droplet matrix morphology. free volume samples been characterized positron annihilation lifetime spectroscopy observing decrease in as poly(hydroxyamino ether) (PHAE) content increases. to water vapor carbon dioxide greatly PHAE....

Lactide-valerolactone copolymers have potential application in the packaging sector. Different were synthesized, and kinetics of copolymerization reactions microstructure analysed. Lactide showed higher reactivity than valerolactone which leads to composition drift through reaction. Thermal, mechanical barrier properties selected studied. Overall, incorporation results with ductility poly(lactide) intermediate water oxygen permeability makes these materials appropriate candidates for use

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) poly(ethylene) (PE) their corresponding samples, which respectively mixed with carbon nanotubes (CNT). performances the elaborated nanocomposites studied morphological, rheological, electrical conductivity tests. Joule heating effect evaluated applying an electric field...

Chemically recyclable polymers have attracted increasing attention since they are promising materials in a circular economy, but such appropriate for packaging applications scarce. Here combined thermal, mechanical, and transport (permeability sorption) study is presented of polymer system based on biobased trans-hexahydrophthalide which, upon polymerization, can lead to amorphous, homochiral crystalline, nanocrystalline stereocomplex materials. This uncovers their largely different...