Role of In situ thermal-reduced graphene oxide on the morphology and properties of biodegradable poly(Lactic acid)/poly(butylene succinate) blends

2017 ◽  
Vol 39 (9) ◽  
pp. 3057-3065 ◽  
Author(s):  
Dazhong Wang ◽  
Xiang Lu ◽  
Jinping Qu
Keyword(s):  
Graphene Oxide ◽  
Lactic Acid ◽  
Reduced Graphene Oxide ◽  
Poly Lactic Acid ◽  
Butylene Succinate ◽  
Reduced Graphene ◽  
Biodegradable Poly

scholarly journals Morphology, Thermal, Mechanical Properties and Rheological Behavior of Biodegradable Poly(butylene succinate)/poly(lactic acid) In-Situ Submicrofibrillar Composites

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2422 ◽  
Author(s):  
Zhiwen Zhu ◽  
Hezhi He ◽  
Bin Xue ◽  
Zhiming Zhan ◽  
Guozhen Wang ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Cold Drawing ◽  
Mechanical Analysis ◽  
Poly Lactic Acid ◽  
Fiber Morphology ◽  
Molding Process ◽  
Butylene Succinate ◽  
Low Frequencies ◽  
Biodegradable Poly

In this study, biodegradable poly(butylene succinate)/poly(lactic acid) (PBS/PLA) in-situ submicrofibrillar composites with various PLA content were successfully produced by a triple-screw extruder followed by a hot stretching−cold drawing−compression molding process. This study aimed to investigate the effects of dispersed PLA submicro-fibrils on the thermal, mechanical and rheological properties of PBS/PLA composites. Morphological observations demonstrated that the PLA phases are fibrillated to submicro-fibrils in the PBS/PLA composites, and all the PLA submicro-fibrils produced seem to have a uniform diameter of about 200nm. As rheological measurements revealed, at low frequencies, the storage modulus (G’) of PBS/PLA composites has been increased by more than four orders of magnitude with the inclusion of high concentrations (15 wt % and 20 wt %) of PLA submicro-fibrils, which indicates a significant improvement in the elastic responses of PBS melt. Dynamic Mechanical Analysis (DMA) results showed that the glass transition temperature (Tg) of PBS phase slightly shifted to the higher temperature after the inclusion of PLA. DSC experiments proved that fiber morphology of PLA has obvious heterogeneous nucleation effect on the crystallization of PBS. The tensile properties of the PBS/PLA in-situ submicrofibrillar composites are also improved compared to neat PBS.

scholarly journals Effects of Graphene Nanoplatelets and Reduced Graphene Oxide on Poly(lactic acid) and Plasticized Poly(lactic acid): A Comparative Study

Polymers ◽  
2014 ◽  
Vol 6 (8) ◽  
pp. 2232-2246 ◽  
Author(s):  
Buong Chieng ◽  
Nor Ibrahim ◽  
Wan Yunus ◽  
Mohd Hussein ◽  
Yoon Then ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lactic Acid ◽  
Comparative Study ◽  
Reduced Graphene Oxide ◽  
Graphene Nanoplatelets ◽  
Poly Lactic Acid ◽  
Reduced Graphene

scholarly journals Chemically Reduced Graphene Oxide-Reinforced Poly(Lactic Acid)/Poly(Ethylene Glycol) Nanocomposites: Preparation, Characterization, and Applications in Electromagnetic Interference Shielding

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 661 ◽  
Author(s):  
Ahmad Fahad Ahmad ◽  
Sidek Ab Aziz ◽  
Zulkifly Abbas ◽  
Suzan Jabbar Obaiys ◽  
Khamirul Amin Matori ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lactic Acid ◽  
Ethylene Glycol ◽  
Reduced Graphene Oxide ◽  
Electromagnetic Interference ◽  
Poly Lactic Acid ◽  
Electromagnetic Interference Shielding ◽  
Poly Ethylene Glycol ◽  
Reduced Graphene ◽  
Poly Ethylene

In this study, a nanocomposite of reduced graphene oxide (RGO) nanofiller-reinforcement poly(lactic acid) (PLA)/poly(ethylene glycol) (PEG) matrix was prepared via the melt blending method. The flexibility of PLA was improved by blending the polymer with a PEG plasticizer as a second polymer. To enhance the electromagnetic interference shielding properties of the nanocomposite, different RGO wt % were combined with the PLA/PEG blend. Using Fourier-transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM) and X-ray diffraction, the structural, microstructure, and morphological properties of the polymer and the RGO/PLA/PEG nanocomposites were examined. These studies showed that the RGO addition did not considerably affect the crystallinity of the resulting nanomaterials. Thermal analysis (TGA) reveals that the addition of RGO highly improved the thermal stability of PLA/PEG nanocomposites. The dielectric properties and electromagnetic interference shielding effectiveness of the synthesized nanocomposites were calculated and showed a higher SE total value than the target value (20 dB). On the other hand, the results showed an increased power loss by increasing the frequency and conversely decreased with an increased percentage of filler.

scholarly journals The Role of Reduced Graphene Oxide in the Suspension Polymerization of Styrene and Its Effect on the Morphology and Thermal Properties of the Polystyrene/rGO Nanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1468
Author(s):  
Marta Sieradzka ◽  
Janusz Fabia ◽  
Dorota Biniaś ◽  
Ryszard Fryczkowski ◽  
Jarosław Janicki
Keyword(s):  
Graphene Oxide ◽  
Thermal Properties ◽  
Reduced Graphene Oxide ◽  
Suspension Polymerization ◽  
Decomposition Temperature ◽  
Reduced Graphene ◽  
The Difference ◽  
Polar Functional Groups

Reduced graphene oxide (rGO) was used to obtain Polystyrene (PS)/rGO nanocomposites via in-situ suspension polymerization. The main goal of the article was to determine how rGO influences the morphology and thermal properties of PS beads. The obtained samples were studied by means of a scanning electron microscope (SEM), and calorimetric and thermogravimetric analysis (DCS, TGA). It was proven that the addition of rGO, due to the presence of polar functional groups, causes significant changes in bead sizes and size distribution, and in their morphology (on the surface and in cross-section). The increasing amount of rGO in the polymer matrix increased the size of beads from 0.36 to 3.17 mm for pure PS and PS with 0.2 wt% rGO content, respectively. PS/rGO nanocomposites are characterized by distinctly improved thermostability, which is primarily expressed in the increase in their decomposition temperature. For a sample containing 0.3 wt% rGO, the difference is more than 12 °C in comparison to pure PS beads.

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