The effect of different clays on the structure, morphology and degradation behavior of poly(lactic acid)

Neppalli, Ramesh; Causin, Valerio; Marega, Carla; Modesti, Michele; Adhikari, Rameshwar; Scholtyssek, Stephanie; Ray, Suprakas Sinha; Marigo, Antonio

doi:10.1016/j.clay.2013.11.029

Cited by 40 publications

(24 citation statements)

References 52 publications

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“…Two different inorganic contents (1 and 2 wt% calculated by taking into account the hybrids organic compounds quantity) were provided. Morphological features investigated by XRD and TEM showed a quite good dispersion of the hybrids, even if in both composite series the presence of large aggregates and tactoids was evidenced despite the apparent macroscopic homogeneity (photos of films as inset in the figures 6 and 7), in agreement with previous literature [14,22]. Specifically the PLA composites obtained by dispersing the MMT-PLANH 3 were easily treated by compression molding resulting in transparent and homogeneous weakly browned films (inset in the Figure 6a).…”

Section: Resultssupporting

confidence: 79%

“…All the surfactants are chosen from among the ammonium salts or carboxylates containing long alkyl chains, aromatic moieties and more recently chemicals able to transfer special functional properties to PLA matrix (antioxidants, UV blockers, chromophores) [11,12]. Quite good results were reached by dispersing the modified inorganic fillers in the PLA matrix with either solvent or melt mixing procedure in terms of morphological and barrier properties (particularly with MMT-based substrates), but the structural and the thermal stability of these systems is still a challenge [10,13,14]. In this scenario the use of organo-modifiers having a chemical structure similar to that of PLA matrix, and, indeed, made by end-functionalized ester oligomers, was here proposed for the first time to modify sodium montmorillonite and Mg-Al layered double hydroxides.…”

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confidence: 99%

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MMT and LDH organo-modification with surfactants tailored for PLA nanocomposites

Coiai¹,

Cicogna²,

Santi³

et al. 2017

Express Polym. Lett.

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Abstract. Low molecular weight polyesters were end-functionalized with ammonium and carboxylate salts and used in ionic exchange reactions with respectively cationic (MMT) and anionic (LDH) clays. The hybrid organic-inorganic substrates were structurally analysed to determine the ester oligomers' modification degree and their thermal behaviour owing to confinement effects. The dispersion of such hybrids in polylactic acid (PLA) matrix was performed and the ultimate structural, morphological and thermal properties of the collected nanocomposites were investigated and correlated to the tailored interfacial properties with the different inorganic substrates. While the composites with MMT proved to be stable under thermo-oxidative conditions, the samples obtained by dispersing the LDH hybrid suffered from poor final thermostability owing to molecular weights decrease. Deeper insights about the effect of the interactions at interface (polymer chain-surfactant and polymer chain-inorganic surface) evidenced that by promoting an intimate contact between PLA chains and LDH surface (through oligoester used as inorganic substrate modifier) a certain extent of PLA hydrolysis triggered by both surfactant and inorganic surface (LDH) occurred and cannot completely avoided.

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Section: Resultssupporting

confidence: 79%

mentioning

confidence: 99%

MMT and LDH organo-modification with surfactants tailored for PLA nanocomposites

Coiai¹,

Cicogna²,

Santi³

et al. 2017

Express Polym. Lett.

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“…The temperature of the compost in real composting was 40 ± 1 °C (lower than the glass transition temperature), which probably led to the slower rate of biodegradation of the composites. Similarly, Bayerl et al [26], Neppalli et al [32] and Petinakis et al [33] reported that virgin PLA has a very slow breakdown compared to natural fiber-reinforced composites. According to Bayerl et al [26], the architecture of fiber structure in a PLA composite can influence the degradation behavior of the composite.…”

Section: Polymers 2015 7 1485mentioning

confidence: 99%

Disposal Options of Bamboo Fabric-Reinforced Poly(Lactic) Acid Composites for Sustainable Packaging: Biodegradability and Recyclability

et al. 2015

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The present study was conducted to determine the recyclability and biodegradability of bamboo fabric-reinforced poly(lactic) acid (BF-PLA) composites for sustainable packaging. BF-PLA composite was recycled through the granulation, extrusion, pelletization and injection processes. Subsequently, mechanical properties (tensile, flexural and impact strength), thermal stability and the morphological appearance of recycled BF-PLA composites were determined and compared to BF-PLA composite (initial materials) and virgin PLA. It was observed that the BF-PLA composites had the adequate mechanical rigidity and thermal stability to be recycled and reused. Moreover, the biodegradability of BF-PLA composite was evaluated in controlled and real composting conditions, and the rate of biodegradability of BF-PLA composites was compared to the virgin PLA. Morphological and thermal characteristics of the biodegradable BF-PLA and virgin PLA were obtained by using environment scanning electron microscopy (ESEM) and differential scanning calorimetry (DSC), respectively. The first order decay rate was found to be 0.0278 and 0.0151 day´1 in a controlled composting condition and 0.0008 and 0.0009 day´1 in Polymers 2015, 7 1477 real composting conditions for virgin PLA and BF-PLA composite, respectively. Results indicate that the reinforcement of bamboo fabric in PLA matrix minimizes the degradation rate of BF-PLA composite. Thus, BF-PLA composite has the potential to be used in product packaging for providing sustainable packaging.

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“…The melting temperature (T m ) of SC-PLA is about 50°C higher than that of PLLA and PDLA, so that SC-PLA should have higher hydrolytic stability, and better thermal and mechanical properties than PLLA [6][7][8][9]. However, there are several properties such as gas permeability, impact strength, flexural properties, that are to be improved for widening the end-use applications of this polymer [10][11][12].…”

Section: Introductionmentioning

confidence: 96%

Organically modified layered zinc phenylphosphonate reinforced stereocomplex-type poly(lactic acid) nanocomposites with highly enhanced mechanical properties and degradability

Chen

2015

J Mater Sci

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In this study, stereocomplex-type poly(L-lactide) (SC-PLA)/organo-modified layered zinc phenylphosphonate (m-PPZn) nanocomposites were synthesized and characterized as a new material for green material usages. A long-chain oleylamine was selected to modify layered zinc phenylphosphonate (PPZn). The structural arrangement of the original and oleylamine-modified PPZn was determined using wide-angle X-ray diffraction (WAXD), and m-PPZn exhibited a large interlayer spacing of 30.3 Å . The correlation length of PPZn derived using several orders of peak profiles decreased with oleylamine addition, suggesting that the structural arrangement of m-PPZn exhibits less perfect alignment. The mechanical properties, structure, and morphology of the SC-PLA/m-PPZn nanocomposites were characterized with dynamic mechanical analysis, WAXD, and transmission electron microscopy (TEM). Both WAXD and TEM results demonstrate that most of the layered materials of partial delamination are randomly dispersed in the SC-PLA matrix. Mechanical properties of the fabricated 1 wt% SC-PLA/m-PPZn nanocomposites show significant enhancements in the storage modulus when compared to SC-PLA matrix. The biodegradability of SC-PLA/m-PPZn nanocomposites was studied with Trizma buffer solution containing proteinase K. It has been shown that the SC-PLA/m-PPZn nanocomposites exhibit a much higher disintegration rate than that of the SC-PLA matrix.

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The effect of different clays on the structure, morphology and degradation behavior of poly(lactic acid)

Cited by 40 publications

References 52 publications

MMT and LDH organo-modification with surfactants tailored for PLA nanocomposites

MMT and LDH organo-modification with surfactants tailored for PLA nanocomposites

Disposal Options of Bamboo Fabric-Reinforced Poly(Lactic) Acid Composites for Sustainable Packaging: Biodegradability and Recyclability

Organically modified layered zinc phenylphosphonate reinforced stereocomplex-type poly(lactic acid) nanocomposites with highly enhanced mechanical properties and degradability

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