Synthesis and Characterization of the Novel Nanocomposites Based on Graphene Oxide/PLLA/PEG-PPG/PLCL Hybrids for Mechanical and Biomedical Applications
Mohammad Javad Azizli, Hengameh Honarkar, Ehsan Vafa, Somayeh Parham, Katayoon Rezaeeparto, Fatemeh Azizli, Mohammad Reza Kianfar, Mohammad Bagher Zarei, Ali Moahammad Amani, Masoud Mokhtary
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Abstract
In this research, the synthesis of new nanocomposites based on Poly (L-lactic acid)/ poly (L-lactide- ɛ-caprolactone) PLLA/PLCL with a ratio of 90/10 and different amounts of graphene oxide (GO) (0.1-1%) was put on the agenda. The poly (ethylene glycol)-block-poly (propylene glycol), PEG-PPG, as a compatibilizer was used in each compound to increase the compatibility of the two phases. Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were applied to study the structure of the obtained samples. Also, morphology, mechanical properties, rheological behavior, thermal stability, dynamic mechanical thermal analysis (DMTA), contact angle, and hydro-catalytic degradation were investigated. The results showed that using the GO, and PEG-PPG compatibilizer significantly decreased the average diameter of the dispersed phase of PLCL in the PLLA matrix. In addition, with the increase of GO contents, the mechanical properties, thermal stability contact angle, storage modulus increased, but hydro-catalytic degradation decreased. The results of scanning electron microscope (SEM) and transmission electron microscopy (TEM) approved that the presence of PEG-PPG compatibilizer significantly affects the dispersion of GO in the PLLA/PLCL matrix. So, the synthesized nanocomposite is a good candidate for mechanical and biomedical applications.
在这项研究中，基于聚（L-乳酸）/聚（L-乳酸-ɛ-己内酯）PLLA/PLCL（比例为 90/10）和不同量的氧化石墨烯（GO）（0.1-1%）的新型纳米复合材料的合成被提上日程。每种化合物中都使用了作为相容剂的聚乙二醇-块状聚丙二醇（PEG-PPG），以增加两相的相容性。傅立叶变换红外光谱（FTIR）和 X 射线衍射（XRD）被用来研究所获得样品的结构。此外，还对形貌、机械性能、流变行为、热稳定性、动态机械热分析（DMTA）、接触角和水催化降解进行了研究。结果表明，使用 GO 和 PEG-PPG 相容剂可显著降低 PLLA 基体中 PLCL 的分散相平均直径。此外，随着 GO 含量的增加，力学性能、热稳定性接触角、储存模量都有所提高，但水催化降解性能有所下降。扫描电子显微镜（SEM）和透射电子显微镜（TEM）的结果表明，PEG-PPG 相容剂的存在会显著影响 GO 在 PLLA/PLCL 基体中的分散。因此，合成的纳米复合材料是机械和生物医学应用的良好候选材料。
期刊介绍：
The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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