Abstract
Miniemulsion 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 Tgs 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.
Highlights
Bio-based polymers, either synthetic or natural, Miniemulsion polymerization technique allows have been widely used for a variety of applications, blend nanoparticles preparation by polymerization of a especially in the nanotechnology field due to the large monomer in the presence of another polymer in a simple range of applications that biopolymer nanoparticles find in biomedical, agricultural, pharmaceutical, chemistry and and effective way
The effect of PLLA incorporation on methyl methacrylate (MMA) and STY homopolymerization reactions was assessed based on the polymerization kinetics, particle morphology and blend miscibility
The influence of PLLA concentration on the homopolymerization kinetics of MMA and STY, particle size evolution during the reactions and molar mass distributions and weight averages (Mw) of the obtained polymers are presented on Figure 1 and Table 1
Summary
Bio-based polymers, either synthetic or natural, Miniemulsion polymerization technique allows have been widely used for a variety of applications, blend nanoparticles preparation by polymerization of a especially in the nanotechnology field due to the large monomer in the presence of another polymer in a simple range of applications that biopolymer nanoparticles find in biomedical, agricultural, pharmaceutical, chemistry and and effective way. Incorporation of highly water-insoluble compounds to the polymeric chain or to the polymer packaging areas, because of their biodegradability, and because they are produced from renewable particles are among the possible benefits of miniemulsion polymerization, since the main mechanism of particle resources[1,2,3,4,5,6] Despite that, biopolymers such as polylactide (PLA) still face some application restrictions due to their formation is the sub-micron monomer-droplets nucleation, minimizing secondary nucleation and mass transport poor mechanical and thermal properties, high crystallinity as well as poor processability and high cost when compared to petroleum-based polymers[6,7,8]. The kinetics and the nucleation mechanism of the miniemulsion polymerization, as well as some properties of the final particles such as its morphology and colloidal stability, may be affected by the type and amount of predissolved polymer added to the miniemulsion dispersion[15]
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