Poly(para‐dioxanone) and poly(L‐lactic acid) blends: thermal, mechanical, and morphological properties

Abstract

Blends of two semicrystalline polymers, poly(l-lactic acid) (PLLA) and poly-p-dioxanone (PPD) have been prepared by solvent casting in different compositions. Thermal, morphological, and mechanical properties of the blends were studied using modulated differential scanning calorimetry, wide-angle X-ray diffractometry, scanning electron microscopy (SEM), polarizing light microscopy (PLM), and tensile tests. Thermal analysis showed two glass transition temperatures nearly constant and equal to the values of the homopolymers and constant values of melting temperature (T m ) for all blend compositions, suggesting that both polymers are immiscible. The PLM and SEM observations validated these results, and showed the different morphology obtained by changing the composition of the blend. The blends 40/60, 50/50, and 60/40 presented a clearly macroseparated system, while the 20/80 and 80/20 blends presented better homogeneity, probably due to the low amount of one component in the other. It was found by PLM that PPD is able to crystallize according to a spherulitic morphology when its content is above 40%. Under this content, the crystallization of PPD is hardly observed. The blend 20/80 is more flexible, and tough material and neck formation during elongation is also observed, due to PPD, which may act as a plasticizer.

Polímeros bioreabsorvíveis na engenharia de tecidos

“…A síntese polímeros híbridos pela a adição de unidades de aminoácidos e/ou peptídeos, buscam materiais específicos e que estimulem a ancoragem celular, bem como a proliferação e diferenciação baseados nas características bioquími-cas das células das membranas das células [71] . Estudos com blendas e copolímeros de materiais aprovados pelo FDA e em uso comercial também representam uma alternativa de novos suportes [72] .…”

Nonisothermal crystallization behaviour of poly(ρ-dioxanone) and poly(L-lactic acid) blends

“…23 * Author for correspondence (baiwei@cioc.ac.cn) Blending PPDO with PLLA has been identified as a conceivable approach to combine the merits of these two polymers. Pezzin et al 24 and Pezzin and Duek 25 prepared blends of PPDO and PLGA by fusion and studied their properties. The interfacial damage properties of plasma-treated biodegradable PPDO fibre/PLLA composites were nondestructively evaluated by Park et al 26 using micromechanical testing and surface wettability measurements.…”

Super-tough poly(lactic acid) materials: Reactive blending with ethylene copolymer

“…Many studies have been carried out blending PLA with various polymers including poly(3-hydroxybutyrate) (PHB) [1], poly-(methyl methacrylate) (PMMA) [2], poly(vinyl acetate) (PVAc) [3], poly(ethylene oxide) (PEO) [4], poly(3-caprolactone) (PCL) [5,6], poly(ethylene-co-vinyl alcohol) (EVOH) [7], poly(p-dioxanone) [8], poly(vinyl alcohol) (PVA) [9], poly(4-vinylphenol) (PVPh) [10], polyethylene (PE) [11][12][13], poly(hydroxy ester ether) (PHEE) [14], poly(butylene adipate-co-terephthalate) (PBAT) [15], poly(butylene succinate) (PBS) [16,17], and starch [17][18][19]. In these PLA blends, some systems are reported to have miscibility or partial miscibility, for example PLA with PMMA, PVAc, PVPh, and PHEE.…”