Thermal Characterization of Biodegradable Poly (Lactic Acid)/Clay Nanocomposites

Krishnamachari, Parakalan; Zhang, Jian; Yan, Jizhong; Shahbazi, Abolghasem; Uitenham, Leonard; Lou, Jianzhong

doi:10.1007/978-0-387-88483-7_29

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…Melt blending (compounding) depends on shear to help delaminate the clay, and it can be concluded that the conditions used (100 rpm for 10 min, the processing temperature being 175 °C) were effective in producing exfoliated nanocomposites. Krishnamachari et al also demonstrated by using X-ray diffraction analysis the completely exfoliated morphology for the combination of PLA and various clays (Cloisite Na+, Cloisite 30B, Cloisite 20A, and nanomer I30E). , It has been established that Cloisite 30B and nanomer I34TCN are more miscible with PLA since a chemical interaction occurs between the carboxyl groups of PLA and the hydroxyl group of the organomodifier …”

Section: Resultsmentioning

confidence: 98%

“…Krishnamachari et al also demonstrated by using X-ray diffraction analysis the completely exfoliated morphology for the combination of PLA and various clays (Cloisite Na+, Cloisite 30B, Cloisite 20A, and nanomer I30E). 13,14 It has been established that Cloisite 30B and nanomer I34TCN are more miscible with PLA since a chemical interaction occurs between the carboxyl groups of PLA and the hydroxyl group of the organomodifier. 16 The WAXD patterns of PLA nanocomposites containing 3 wt % of various nanoclays indicate the formation of exfoliated structures.…”

Section: Resultsmentioning

confidence: 99%

“…In order to improve PLA properties, different layered silicate nanoclays are added as montmorillonites without or with organic modifiers. , The PLA/clay nanocomposites are extensively studied. They have been prepared using various kinds of clays such as Cloisite 20A, Cloisites 25A and 30B, montmorillonite modified with octadecylammonium, dimethyl dialkyl amine, or trimethyl stearyl ammonium, , and Cloisite 30B in the presence of a chain extender. , ̇Series of clays (Cloisite Na+, Cloisite 30B, Cloisite 20A, and nanomer I30E) have been incorporated to study the effect on crystallization or on degradability , such as 30B, 25A, and 15A montmorillonites, , saponite, and synthetic fluorine mica or the influence of different organic modifiers such as methyl triphenyl phosphonium bromide, n -octyl tri- n -butyl phosphonium bromide, n -dodecyl tri- n -butyl phosphonium bromide, and n -hexadecyl tri- n -butyl phosphonium bromide have been followed. Organic modifiers of various chain lengths were examined in different types of clays, smectite, montmorillonite (MMT), and mica, to prepare their corresponding organoclays.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Nanoclay Hydrophilicity on the Poly(lactic acid)/Clay Nanocomposites Properties

Darie

Pâslaru

Sdrobiş

et al. 2014

Ind. Eng. Chem. Res.

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In order to improve poly(lactic acid) (PLA) mechanical, thermal, and barrier properties, different layered silicate nanoclays are added. This work deals with the study of the effect of the type of nanoclays with different hydrophilicity on the preparation procedure and properties of PLA nanocomposites. Six kinds of clays have been loaded in PLA whose hydrophilicity varies in the following order of increased hydrophilicity: modified Dellite 67G (67G) < Cloisite 15A (C15A) < C20A < C93A < C30B < hydrophilic smectite clay (HPS). Resultant nanocomposites have been characterized both with respect to bulk and surface properties by mechanical, rheological, thermal analyses, X-ray diffraction study, Fourier transform infrared spectroscopy, gas permeability tests, contact angle measurements, scanning electron microscopy, and atomic force microscopy. Antimicrobial properties have been also tested. Evidenced was the dependence of most properties on the hydrophilicity/hydrophobicity of the clays. The nanocomposites containing the most hydrophilic clays such as Cloisite 93A, Cloisite 30B, and HPS show satisfactory antimicrobial activity against both Gram-positive and Gram-negative bacteria, excepting fungus Candida albicans.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Nanoclay Hydrophilicity on the Poly(lactic acid)/Clay Nanocomposites Properties

Darie

Pâslaru

Sdrobiş

et al. 2014

Ind. Eng. Chem. Res.

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“…TMDSC revealed a T g value of 40°C ( Figure 12 ) (i.e., lower than native PLA and MAA, thus indicating a shift to lower temperatures which is typical of PLA [ 50 ]). PLA is a relatively stiff and brittle polymer with low deformation at break [ 51 ]. It is also possible that the deconvolution of the total TMDSC signals for the PLA-MAA nanoparticles in the reversing and nonreversing events was lower than either of the two polymers.…”

Section: Resultsmentioning

confidence: 99%

Composite Polylactic-Methacrylic Acid Copolymer Nanoparticles for the Delivery of Methotrexate

Sibeko

Choonara

Toit

et al. 2012

Journal of Drug Delivery

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The purpose of this study was to develop poly(lactic acid)-methacrylic acid copolymeric nanoparticles with the potential to serve as nanocarrier systems for methotrexate (MTX) used in the chemotherapy of primary central nervous system lymphoma (PCNSL). Nanoparticles were prepared by a double emulsion solvent evaporation technique employing a 3-Factor Box-Behnken experimental design strategy. Analysis of particle size, absolute zeta potential, polydispersity (Pdl), morphology, drug-loading capacity (DLC), structural transitions through FTIR spectroscopy, and drug release kinetics was undertaken. Molecular modelling elucidated the mechanisms of the experimental findings. Nanoparticles with particle sizes ranging from 211.0 to 378.3 nm and a recovery range of 36.8–86.2 mg (Pdl ≤ 0.5) were synthesized. DLC values were initially low (12 ± 0.5%) but were finally optimized to 98 ± 0.3%. FTIR studies elucidated the comixing of MTX within the nanoparticles. An initial burst release (50% of MTX released in 24 hours) was obtained which was followed by a prolonged release phase of MTX over 84 hours. SEM images revealed near-spherical nanoparticles, while TEM micrographs revealed the presence of MTX within the nanoparticles. Stable nanoparticles were formed as corroborated by the chemometric modelling studies undertaken.

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“…Whether they are organic or inorganic in nature, fillers can be either fibrous or particulate, both of which have been incorporated into PLA with the goal of increasing its performance capabilities. For instance, to increase the thermal resistance of PLA, researchers have incorporated into it clay,1, 2 carbon fibers,3 and glass fibers,4 each with the aim of increasing crystallization. Urayama et al5 studied the effects of particle‐type and whisker‐type fillers on the thermal and mechanical properties of PLA.…”

Section: Introductionmentioning

confidence: 99%

The effect of maleated polylactic acid (PLA) as an interfacial modifier in PLA‐talc composites

Fowlks

Narayan

2010

J of Applied Polymer Sci

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Polylactic acid (PLA)-talc composites were reactively compatibilized using maleic anhydride-functionalized PLA (MAPLA) as an interfacial additive. The effect of MAPLA was investigated based on evaluation of composite properties and examination of the microstructure using scanning electron microscopy. The incorporation of MAPLA contributed to an increase in the crystallinity of PLA in the composites, and when added in an optimal concentration, showed improved tensile strength. Thermo-mechanical measurements indicated the reinforcement effect of the talc and the coupling effect of the MAPLA inclusion. Microscopic studies revealed the composite microstructures along with the corresponding modes of failure which were in accordance with the mechanical behavior. Overall, this investigation provided experimental evidence of enhanced adhesion at the interface, which is believed to be due to the MAPLA addition.

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Thermal Characterization of Biodegradable Poly (Lactic Acid)/Clay Nanocomposites

Cited by 4 publications

References 5 publications

Effect of Nanoclay Hydrophilicity on the Poly(lactic acid)/Clay Nanocomposites Properties

Effect of Nanoclay Hydrophilicity on the Poly(lactic acid)/Clay Nanocomposites Properties

Composite Polylactic-Methacrylic Acid Copolymer Nanoparticles for the Delivery of Methotrexate

The effect of maleated polylactic acid (PLA) as an interfacial modifier in PLA‐talc composites

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