Preparation and properties of multi-branched poly(D-lactide) derived from polyglycidol and its stereocomplex blends

Petchsuk, Atitsa; Buchatip, Suthawan; Supmak, Wilairat; Opaprakasit, Mantana; Opaprakasit, Pakorn

doi:10.3144/expresspolymlett.2014.80

Cited by 21 publications

(18 citation statements)

References 47 publications

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“…In the study from Petchsuk et al [4], the molecular weight of PDLA is critical in the formation of the stereocomplex structure, which in turn imposes a large influence on the enhancement of the mechanical properties. When the molecular weight of PDLA was low, the tensile strength and modulus decreased but the elongation-at-break and toughness increased significantly.…”

Section: Tensile Propertiesmentioning

confidence: 98%

“…PLA exists in three isomeric forms: L-lactide (semicrystalline), D-lactide (semi-crystalline), and DL-lactide (amorphous) [3]. PLA is widely used in many applications, especially in the packaging, biomedical, agricultural, and environmental fields, due to its high mechanical strength and excellent shaping and molding properties [4]. However, PLA lacks some of the required properties for some applications.…”

Section: Introductionmentioning

confidence: 99%

“…Stereocomplexation is a promising technique to enhance PLA properties by using the strong interaction between poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) [4]. One of the most characteristic features of stereocomplex crystallites is their high melting point; e.g., 50 C higher than that of PLLA or PDLA homocrystallites [7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Injection molding and characterization of polylactide stereocomplex

Srithep

Pholharn

Turng

et al. 2015

Polymer Degradation and Stability

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Section: Tensile Propertiesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Injection molding and characterization of polylactide stereocomplex

Srithep

Pholharn

Turng

et al. 2015

Polymer Degradation and Stability

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“…In the case of cellulose fibre reinforcement, it is supposed that the increased dynamic viscosity ( Figure 2) and thus the hindrance of molecular chain mobility decreased the crystallization. The high degree of crystallinity is, however, crucial to obtain improved thermo-mechanical properties [24,25]. The prominent nucleating ability of basalt fibres has been utilized recently by Tábi et al [26] to obtain crystalline PLA composites of high heat deflection temperatures.…”

Section: Crystallinitymentioning

confidence: 99%

Characterisation of natural fibre reinforced PLA foams prepared by supercritical CO2 assisted extrusion

Bocz¹,

Tábi²,

Vadas³

et al. 2016

Express Polym. Lett.

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Abstract. Natural fibre reinforced polylactic acid (PLA) foams, as potential green replacements for petroleum-based polymer foams, were investigated. Highly porous (ε > 95%) microcellular PLA foams were manufactured by supercritical CO 2 assisted extrusion process. To overcome the inherently low melt strength of PLA, epoxy-functionalized chain extender was applied, while talc was added to improve its crystallization kinetics. The combined application of chain extender and talc effectively promoted the formation of uniform cell structures. The effect of cellulose and basalt fibre reinforcement on the foamability, morphology, structure and mechanical properties of the PLA foams were investigated as well. The addition of 5 wt% natural fibres promoted the cell nucleation, but caused non-uniform distribution of cell size due to the microholes induced by local fibre-matrix debonding. The compression strength of the manufactured basalt fibre reinforced PLA foams reached 40 kPa.

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“…They showed that the elongation at break was increased by more than 10 times compared to neat PLA, using 20 wt% poly(ester amide). Miscible blends with poly(L-lactide) (PLLA), characterized by a reduced viscosity, were obtained by Petchsuk et al 32 using multibranched poly(D-lactide) (mbPDLA) as a modifier. However, the reduction of viscosity was probably caused mainly by the low M n of mbPDLA which was almost four times smaller than that of linear PLLA.…”

Section: Introductionmentioning

confidence: 99%

Multi‐arm star polymers of lactide obtained in melt in the presence of hyperbranched oligoglycerols

Kundys

Plichta

Florjańczyk

et al. 2016

Polymer International

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Multi-arm star poly(L-lactide) (PLLA) was synthesized in bulk, via ring-opening polymerization of L-lactide initiated by: trimethylolpropane, pentaerythritol, dipentaerythritol, myo-inositol and hyperbranched polyglycerols. The synthesis was carried out on a laboratory scale and also in a model research installation equipped with a 2 L polymerization reactor. Matrix-assisted laser desorption ionization time-of-flight analysis of the products synthesized in the presence of simple polyols and tin 2-ethylhexanoate revealed that the reactions were not entirely selective and the final products were a mixture of multi-arm star, linear and cyclic PLLA. The reactions co-initiated by polyglycerols (PGs) led to polymer mixtures with molar masses in the range 13.5-102 kg mol −1 and intrinsic viscosity significantly lower than that of linear PLLA with the same molar mass. In order to obtain more hydrophobic PG initiator, a suitable method of modification of PG structure was developed. The PG and modified PG branching agents were used to prepare multi-arm star PLLA in the model semi-technical installation. Molar masses of the resulting polymers were in the range 169-249 kg mol −1 and exhibited much lower intrinsic viscosity than the linear homologue. The rheological properties of synthesized materials with commercial PLLA blends as well as thermal and mechanical properties were analysed.

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Preparation and properties of multi-branched poly(D-lactide) derived from polyglycidol and its stereocomplex blends

Cited by 21 publications

References 47 publications

Injection molding and characterization of polylactide stereocomplex

Injection molding and characterization of polylactide stereocomplex

Characterisation of natural fibre reinforced PLA foams prepared by supercritical CO2 assisted extrusion

Multi‐arm star polymers of lactide obtained in melt in the presence of hyperbranched oligoglycerols

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