Blends of amorphous and crystalline polylactides with poly(methyl methacrylate) and poly(methyl acrylate): a miscibility study

Eguiburu, J. L.; Iruin, J. J.; Fernández‐Berridi, M. J.; Román, Julio San

doi:10.1016/s0032-3861(98)00182-7

Cited by 145 publications

(108 citation statements)

References 39 publications

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“…PLLA can be seen as light gray and Eudragit S100 as black due to differences in contrast under the electron beam, indicating that the more hydrophilic PLLA formed an outer shell and Eudragit S100 in the particles core as demonstrated in other works [31] . This core-shell morphology is also supported by the fact that, depending on the process kinetic, the semi-crystalline structure of PLLA could act as a driving force for phase separation [32] . It is worth noting that in both cases no free curcumin crystals could be found corroborating the encapsulation values found (Table 2).…”

Section: Nanoparticles Characterizationmentioning

confidence: 79%

Preparation of curcumin-loaded nanoparticles and determination of the antioxidant potential of curcumin after encapsulation

et al. 2016

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SbstractEncapsulation of bioactive compounds has been carried out to improve bioavailability and to protect them against harm conditions. However, encapsulation processes are often aggressive and it is important that encapsulated substances keep their biological activity. In this work curcumin was nanoencapsulated using dichloromethane as solvent and ultrasound as dispersion device. Nanoparticles were obtained using different curcumin concentrations and encapsulants (PLLA and Eudragit S100) and the encapsulation efficiency was inferred using spectroscopic and calorimetric techniques as well as optical microscopy. Total phenolic contents and antioxidant activity tests were applied to the curcumin before and after encapsulation and also to blank polymer nanoparticles. Results demonstrated that the encapsulation process had no deleterious influence on its antioxidant activity.

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Section: Nanoparticles Characterizationmentioning

confidence: 79%

Preparation of curcumin-loaded nanoparticles and determination of the antioxidant potential of curcumin after encapsulation

et al. 2016

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“…As can be seen, semi-crystalline PLLA presented an endothermic peak maximum at 158 °C which corresponds to its melting temperature, whereas PMMA and PS are totally amorphous. The endothermic peak of PLLA is no longer detected on blend nanoparticles DSC curves, which may correspond to a decrease of the degree of crystallinity of PLLA and indicates that PMMA and PS molecules restricted the crystallization of PLLA in the blend [9] . In both PLLA/PMMA and PLLA/ PS blend nanoparticles samples evaluated, two Tg values close to those of the homopolymers can be observed in each thermogram confirming the formation of an immiscible blend as was already observed on TEM images in Figure 2. …”

Section: Preparation Of Plla/pmma and Plla/ps Binary Blend Nanoparticmentioning

confidence: 98%

“…Also, blending can improve specific polymer properties by providing part of the biopolymers biofuncionality and easy processability of synthetic polymers to the final product [5,6,9,10] . Blending pre-made polymers allows assembling in the final material certain combinations of desired properties exhibited individually by the homopolymers.…”

Section: Introductionmentioning

confidence: 99%

Preparation of PLLA/PMMA and PLLA/PS binary blend nanoparticles by incorporation of PLLA in methyl methacrylate or styrene miniemulsion homopolymerization

Peres

Araújo

et al. 2015

Polímeros

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SbstractMiniemulsion homopolymerization reactions of methyl methacrylate (MMA) and styrene (STY) using poly(L-lactide) as co-stabilizer were carried out in order to prepare poly(L-lactide)/poly(methyl methacrylate) (PLLA/PMMA) and poly(L-lactide)/polystyrene (PLLA/PS) binary blend nanoparticles. The effect of PLLA concentration on methyl methacrylate (MMA) and styrene (STY) homopolymerization reactions was evaluated. It was found that the incorporation of PLLA resulted on acceleration of MMA and STY homopolymerization reactions and led to a molar mass increase of up to 70% for PS in PLLA/PS blend nanoparticles in relation to those prepared without PLLA, which can be attributed to an increase of reaction loci viscosity (gel effect). PLLA also acted as an efficient co-stabilizer, since it was able to retard diffusional degradation of droplets when no other kind of co-stabilizer was used. Two isolated T g s were found in both PLLA/PMMA and PLLA/PS blend nanoparticles which can be associated to blend immiscibility. TEM images corroborate these results, suggesting that immiscible PLLA/PMMA and PLLA/PS blend nanoparticles could be formed with two segregated phases and core-shell morphology.

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“…Polymethyl methacrylate (PMMA) has been found to form miscible alloys with polylactic acid (PLA), a bio-based, biodegradable polyester (Eguiburu et al 1998;Zhang et al 2002). Miscibility also means that PMMA and PLA can be blended at any ratio, keeping the transparency high.…”

Section: Acrylic/pla Blendsmentioning

confidence: 99%

Commercial Polymer Blends

Akkapeddi¹

2014

Polymer Blends Handbook

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Blends of amorphous and crystalline polylactides with poly(methyl methacrylate) and poly(methyl acrylate): a miscibility study

Cited by 145 publications

References 39 publications

Preparation of curcumin-loaded nanoparticles and determination of the antioxidant potential of curcumin after encapsulation

Preparation of curcumin-loaded nanoparticles and determination of the antioxidant potential of curcumin after encapsulation

Preparation of PLLA/PMMA and PLLA/PS binary blend nanoparticles by incorporation of PLLA in methyl methacrylate or styrene miniemulsion homopolymerization

Commercial Polymer Blends

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