Poly(L‐lactide)/layered double hydroxides nanocomposites: Preparation and crystallization behavior

Novel nanocomposites from poly(L-lactide) (PLLA) and an organically modified layered double hydroxide (LDH) were prepared using the melt-mixing technique. The structure and crystallization behavior of these nanocomposites were investigated by means of wide-angle X-ray diffraction (WAXD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), and polarized optical microscopy (POM). WAXD results indicate that the layer distance of dodecyl sulfate-modified LDH (LDH-DS) is increased in the PLLA/LDH composites, compared with the organically modified LDH. TEM analysis suggests that the most LDH-DS layers disperse homogenously in the PLLA matrix in the nanometer scale with the intercalated or exfoliated structures. It was found that the incorporation of LDH-DS has little or no discernable effect on the crystalline structure as well as the melting behavior of PLLA. However, the crystallization rate of PLLA increases with the addition of LDH-DS. With the incorporation of 2.5 wt % LDH-DS, the PLLA crystallization can be finished during the cooling process at 5 °C/min. With the addition of 5 wt % LDH-DS, the half-times of isothermal melt-crystallization of PLLA at 100 and 120 °C reduce to 44.4% and 57.0% of those of the neat PLLA, respectively. POM observation shows that the nucleation density increases and the spherulite size of PLLA reduces distinctly with the presence of LDH-DS.

[1]  Masatoshi Matsuda,et al.  Crystallization and Melting Behavior of Poly (l-lactic Acid) , 2007 .

[2]  Y. Inoue,et al.  Polymorphous Crystallization and Multiple Melting Behavior of Poly(l-lactide): Molecular Weight Dependence , 2007 .

[3]  C. Laurencin,et al.  Biodegradable polymers as biomaterials , 2007 .

[4]  Eduardo Ruiz-Hitzky,et al.  Bionanocomposites: A New Concept of Ecological, Bioinspired, and Functional Hybrid Materials , 2007 .

[5]  Tzong‐Ming Wu,et al.  Nonisothermal crystallization behavior and crystalline structure of poly(3‐hydroxybutyrate)/layered double hydroxide nanocomposites , 2007 .

[6]  Liang Wu,et al.  Nonisothermal cold crystallization behavior and kinetics of polylactide/clay nanocomposites , 2007 .

[7]  L. Tammaro,et al.  New nanohybrids of poly(ε‐caprolactone) and a modified Mg/Al hydrotalcite: Mechanical and thermal properties , 2007 .

[8]  C. Hoyo.  Layered double hydroxides and human health: An overview , 2007 .

[9]  D. Ghanotakis,et al.  Intercalation of hydrophilic and hydrophobic antibiotics in layered double hydroxides. , 2007, International journal of pharmaceutics.

[10]  S. Im,et al.  Thermomechanical properties and crystallization behavior of layered double hydroxide/poly(ethylene terephthalate) nanocomposites prepared by in‐situ polymerization , 2007 .

[11]  Tzong‐Ming Wu,et al.  Isothermal crystallization kinetics of poly(3‐hydroxybutyrate)/layered double hydroxide nanocomposites , 2006 .

[12]  M. Pluta.  Melt compounding of polylactide/organoclay: Structure and properties of nanocomposites , 2006 .

[13]  P. Ding,et al.  Structure, thermal stability, and photocrosslinking characterization of HDPE/LDH nanocomposites synthesized by melt‐intercalation , 2006 .

[14]  Dermot O'Hare,et al.  Towards understanding, control and application of layered double hydroxide chemistry , 2006 .

[15]  Maurizio Fermeglia,et al.  Structure and energetics of biocompatible polymer nanocomposite systems: a molecular dynamics study. , 2006, Biomacromolecules.

[16]  G. Heinrich,et al.  Nanocomposites based on polyethylene and Mg–Al layered double hydroxide. Part II. Rheological characterization , 2006 .

[17]  K. Kim,et al.  Preparation and properties of layered double hydroxide/poly(ethylene terephthalate) nanocomposites by direct melt compounding , 2006 .

[18]  P. Dubois,et al.  Plasticized polylactide/clay nanocomposites. I. The role of filler content and its surface organo‐modification on the physico‐chemical properties , 2006 .

[19]  J. Gilman,et al.  Delamination of organo-modified layered double hydroxides in polyamide 6 by melt processing , 2006 .

[20]  F. Leroux,et al.  Fine tuning between organic and inorganic host structure: new trends in layered double hydroxide hybrid assemblies , 2005 .

[21]  M. Kaneko,et al.  Melt intercalation of poly(l-lactide) chains into clay galleries , 2005 .

[22]  Y. Ozaki,et al.  Crystal Modifications and Thermal Behavior of Poly(l-lactic acid) Revealed by Infrared Spectroscopy , 2005 .

[23]  S. Vasudevan,et al.  Anionic clays containing anti-inflammatory drug molecules: comparison of molecular dynamics simulation and measurements. , 2005, The journal of physical chemistry. B.

[24]  Cheng‐Chien Wang,et al.  The disorderly exfoliated LDHs/PMMA nanocomposite synthesized by in situ bulk polymerization , 2005 .

[25]  Manjusri Misra,et al.  A Study on Biocomposites from Recycled Newspaper Fiber and Poly(lactic acid) , 2005 .

[26]  M. Abdel-Goad,et al.  Nanocomposites based on polyethylene and Mg–Al layered double hydroxide. I. Synthesis and characterization , 2005 .

[27]  Qipeng Yuan,et al.  Layered solids as a “molecular container” for pharmaceutical agents: L-tyrosine-intercalated layered double hydroxides , 2005 .

[28]  M. Cakmak,et al.  The role of plasticizer on the exfoliation and dispersion and fracture behavior of clay particles in PVC matrix: a comprehensive morphological study , 2004 .

[29]  V. Rives,et al.  Mg,Al layered double hydroxides with intercalated indomethacin: synthesis, characterization, and pharmacological study. , 2004, Journal of pharmaceutical sciences.

[30]  C. Delmas,et al.  Tentative mechanisms for acrylate intercalation and in situ polymerization in nickel-based Layered Double Hydroxides , 2004 .

[31]  Y. Inoue,et al.  Alpha-cyclodextrin-enhanced crystallization of poly(3-hydroxybutyrate). , 2003, Biomacromolecules.

[32]  D. Pochan,et al.  Poly (l-Lactic Acid)/Layered Silicate Nanocomposite: Fabrication, Characterization, and Properties , 2003 .

[33]  Y. Kimura,et al.  Structural Characterization and Enzymatic Degradation of α‐, β‐, and γ‐Crystalline Forms for Poly(β‐propiolactone) , 2003 .

[34]  S. Ray,et al.  Biodegradable Polylactide and Its Nanocomposites: Opening a New Dimension for Plastics and Composites , 2003 .

[35]  Wei Chen,et al.  Structural Characteristics and Thermal Properties of PE-g-MA/MgAl-LDH Exfoliation Nanocomposites Synthesized by Solution Intercalation , 2003 .

[36]  P. Degée,et al.  Exfoliated polylactide/clay nanocomposites by in-situ coordination-insertion polymerization , 2003 .

[37]  S. Ray,et al.  Control of Biodegradability of Polylactide via Nanocomposite Technology , 2003 .

[38]  Z. Xu,et al.  High affinity of dodecylbenzene sulfonate for layered double hydroxide and resulting morphological changes , 2003 .

[39]  J. Besse,et al.  Poly(styrene sulfonate) layered double hydroxide nanocomposites. Stability and subsequent structural transformation with changes in temperature , 2003 .

[40]  D O'Hare,et al.  Intercalation and controlled release of pharmaceutically active compounds from a layered double hydroxide. , 2001, Chemical communications.

[41]  D. Uskoković,et al.  Synthesis and properties of hydroxyapatite/poly-?-lactide composite biomaterials , 1999, Biomaterials.

[42]  Jin-Ho Choy,et al.  Intercalative nanohybrids of nucleoside monophosphates and DNA in layered metal hydroxide , 1999 .

[43]  T. Masuko,et al.  Morphology of poly(l-lactide) solution-grown crystals , 1997 .

[44]  G. Lagaly,et al.  Anion-exchange reactions of hydroxy double salts , 1993 .

[45]  J. Hoffman.  Regime III crystallization in melt-crystallized polymers: The variable cluster model of chain folding , 1983 .

[46]  A. Pennings,et al.  General crystallization behaviour of poly(l-lactic acid) , 1980 .

[47]  M. Avrami.  Granulation, Phase Change, and Microstructure Kinetics of Phase Change. III , 1941 .