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

Abstract

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.

Enhanced Photodegradation Stability in Poly(butylene adipate-co-terephthalate) Composites Using Organically Modified Layered Zinc Phenylphosphonate

“…The data of PBAT and the composites were normalized to the peak at 2θ = 23.21°. In our previous report, three diffraction peaks at 2θ = 6.34°, 12.49°, and 18.68° were observed for the PPZn, which correspond to the (010), (020), and (030) crystal planes, respectively [ 35 ]. In this study, three diffraction peaks at 2θ = 3.30°, 6.51°, and 9.72° were observed for the PPZn, which occur at the (010), (020), and (030) crystal planes, respectively.…”

Melt Processing and Characterization of Biodegradable Poly(butylene succinate-<em>co</em>-adipate)/Hexadecylamine-Modified Layered Zinc Phenylphosphonate Nanocomposites

“…Melt processing of PBSA/m-PPZn nanocomposites. Hexadecylamine-intercalated PPZns were prepared by a similar approach reported previously [12,13]. The 1, 3 and 5 wt % PBSA/m-PPZn nanocomposites were fabricated by mixing the m-PPZn, PBSA, and polyoxyethylene bis(amine) at 105 °C using a single-screw extruder (Brabender Mix 30/50E) for 5 min.…”

“…However, the interlayer distance of PPZn is extremely small for the insertion of polymer chains into its interlayer gallery. To overcome this problem, organo-modifiers served as delamination compound to enlarge the interlayer spacing of PPZn have been applied [12,13]. The biocompatible and nontoxic organo-modifiers was selected owing to the preparation of fully green nanocomposites.…”

Synthesis, Physical Properties and Enzymatic Degradation of Biodegradable Nanocomposites Fabricated Using Poly(Butylene Carbonate-Co-Terephthalate) and Organically Modified Layered Zinc Phenylphosphonate

“…Consequently, this study intends to synthesize poly (butylene carbonate-co-terephthalate) (PBCT) copolymer with suitable properties via transesterification and the polycondensation method. In order to further enhance these mechanical and thermal properties of PBCT copolymer, the addition of excellent physical properties of inorganic materials acting as nucleating agents and reinforcements into the polymer matrix is undertaken to accelerate their crystallization rates and improve their physical properties [ 10 , 11 , 12 , 13 ]. Reinforcing layered zinc phenylphosphonates (PPZn) has received significant attention owing to the enhancement of the crystallization rates and physical properties of polymers [ 9 , 10 , 14 , 15 , 16 ].…”