Silsesquioxanes: Novel compatibilizing agents for tuning the microstructure and properties of PLA/PCL immiscible blends

Monticelli, Orietta; Calabrese, Michela; Gardella, Lorenza; Fina, Alberto; Gioffredi, Emilia

doi:10.1016/j.eurpolymj.2014.06.021

Cited by 70 publications

(60 citation statements)

References 41 publications

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“…As the PCL content on PHB-PCL blends increases, we observe a decrease in both tensile strength and elastic modulus values but, in contrasts, the elongation at break (ductile properties) is remarkably improved. In fact, raw PCL and high PHB-PCL blends with high PCL content (PHB25/PCL75) didn't break; samples covered the maximum displacement of the machine with elongation values over 1000% [25]. As it can be observed, for PHB-PCL composites with less than 50 wt% PCL, the elongation at break is relatively low and presence of PCL leads to a slight increase in elongation at break from values of 8.1% (raw PHB) up to 17.6% for PHB-PCL blends with 50 wt% PCL.…”

Section: Tablementioning

confidence: 99%

Processing and characterization of binary poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL) blends with improved impact properties

et al. 2016

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2 AbstractThe present work is focused on the development of binary blends from poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL). Miscibility, mechanical and thermal properties as well as blends morphology are evaluated in terms of the blend composition. Binary PHB-PCL blends were manufactured by melt compounding in a twin screw co-rotating extruder and injection molded. Composition of PHB-PCL covered the full range between individual polymers at 25 wt% increments. The obtained results show that PCL acts as an impact modifier thus leading to an increase in flexibility and ductility as the PCL content on PHB-PCL blends increases with a noticeable increase in elongation at break and on

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Section: Tablementioning

confidence: 99%

Processing and characterization of binary poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL) blends with improved impact properties

et al. 2016

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“…However, this improvement is limited by the low compatibility of PLA/PCL blends. Therefore, efficient compatibilizer for PLA/PCL blends has been intensively asked [28][29][30][31]. Less care has been paid to study effect of the properties of the component, and mixing and processing conditions on the morphology of PLA/PCL blends [32].…”

Section: Introductionmentioning

confidence: 99%

Phase structure evolution during mixing and processing of poly(lactic acid)/polycaprolactone (PLA/PCL) blends

et al. 2015

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The morphology of quenched and compression molded samples of poly(lactic acid)/polycaprolactone (PLA/PCL) blend prepared by melt mixing was carefully characterized by the method reflecting eventual nonuniformity of the blend structure and/or broad particle size distribution. Determined number and volume average droplet radii for quenched samples were compared with theory, assuming that flow field in a mixing chamber can be substituted by the shear flow with effective shear rate. An increase in droplet radii during compression molding was compared with theory of the coalescence in quiescent state. Using the concept of effective shear flow to describe mixing leads to a strong disagreement between theory and experiment for the critical droplet radius of its breakup, and for the coalescence efficiency. The theory of coalescence in quiescent state provides fair description of an increase in the number average droplet radius during compression molding, but totally fails at prediction of an increase in the volume average droplet radius.

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“…However, PCL and PLA are thermodynamically incompatible with each other and can only form a multiphase structure in their blended system, with poor interfacial adhesion, which restricts its further applications. Considerable efforts have been made to enhance the compatibility between PLA and PCL by using generally established compatibilization strategies, such as the addition of polymeric compatibilizers [6][7][8][9][10] and reactive compatibilization methods. In particular, the latter method consists in the formation of block, graft, or cross-linked copolymers at the interface through covalent bond formation in situ during the reactive compatibilization step.…”

Section: Introductionmentioning

confidence: 99%

PLA maleation: an easy and effective method to modify the properties of PLA/PCL immiscible blends

2014

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In this study, maleic-anhydride-grafted polylactide (PLA-g-MA) was investigated as a potential compatibilizing agent for the polylactide (PLA)/poly(ε-caprolactone) (PCL) system, with the aim of enhancing the final properties of the two polymer blends. Indeed, PLA-g-MA was prepared via reactive blending through a free radical process and characterized by means of 1 H-NMR and titration measurements, which demonstrated that the employed procedure allows grafting 0.7 wt% of MA onto the polymer backbone, while avoiding a dramatic reduction of PLA molecular mass. The specific effect of the MA-grafted PLA on the features of the PLA/PCL system was highlighted by adding different amounts of PLA-g-MA to 70:30 (w/w) PLA/PCL blends, where the 70 % PLA component was progressively substituted by its maleated modification. The efficiency of PLA-g-MA as a compatibilizer for the PLA/PCL blends was assessed through SEM analysis, which showed that the dimensions of PCL domains decrease and their adhesion to PLA improves by increasing the amount of PLA-g-MA in the blends. The peculiar microstructure promoted by the presence of PLA-g-MA was found to enhance the mechanical properties of the blend, improving the elongation at break without decreasing its Young's modulus. Our study demonstrated that not only the microstructure but also the thermal properties of the blends were significantly affected by the replacement of PLA with PLA-g-MA.

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Silsesquioxanes: Novel compatibilizing agents for tuning the microstructure and properties of PLA/PCL immiscible blends

Cited by 70 publications

References 41 publications

Processing and characterization of binary poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL) blends with improved impact properties

Processing and characterization of binary poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL) blends with improved impact properties

Phase structure evolution during mixing and processing of poly(lactic acid)/polycaprolactone (PLA/PCL) blends

PLA maleation: an easy and effective method to modify the properties of PLA/PCL immiscible blends

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