Article
Materials Science, Multidisciplinary
Xavier Lacambra Andreu, Jean-Marc Chenal, Abderrahim Maazou, Khalid Lamnawar
Summary: The aim of this work was to study a 3D manufacturing process called 3D Direct Pellet multi-Extrusion (DPPmE) for creating functionally graded materials (FGM) for bone regeneration. Poly(D,L-lactic acid) (PDLLA) matrix and bioglass (BG) or hydroxyapatite (HA) bioactive fillers were used to obtain hybrid FGM with tailored properties. Different strategies of DPPmE were employed to control the properties of the materials. The results showed good interfaces, adhesion properties, and desirable mechanical properties, making it a promising technique for fabricating tailored FGM composites.
ACS APPLIED POLYMER MATERIALS
(2023)
Review
Chemistry, Physical
Xinran Zhou, Pooi See Lee
Summary: Nanogenerators are mechanical energy harvesters that convert mechanical energy into electric energy for powering portable devices. The use of 3D printing enables the creation of complex structures in nanogenerators, offering advantages in addressing challenges. Additionally, the principle and application of 4D printing play a critical role in nanogenerator fabrication.
Article
Chemistry, Multidisciplinary
Rami Hador, Michael Shuster, Vincenzo Venditto, Moshe Kol
Summary: This study proposes a new approach to tolerate stereoerrors in the polymer by crowding them in a stereogradient copolymer. A zirconium complex of an amine tris(phenolate) ligand is used as a catalyst for the ring opening polymerization of meso-lactide at room temperature, and stereogradient copolymers are formed in the polymerization of mixtures of meso-lactide/L-lactide at 180 degrees C. These stereogradient copolymers exhibit enhanced crystallinities compared to stereorandom copolymers obtained with tin octanoate.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Lidong Feng, Xinchao Bian, Gao Li, Xuesi Chen
Summary: The study shows that the compatibility between PLLA and PLDLA-m decreases as the L-lactate unit content in PLDLA-m decreases, impacting the crystallization and compatibility of the blends.
Article
Nanoscience & Nanotechnology
Jingfeng Liu, Jintao Liu, Xuan Zhang, Xingang Liu, Chuhong Zhang
Summary: Piezoelectric sponges with functional 3D structures are successfully customized using a composite ink and freeze-drying method. These sponges exhibit excellent compression recovery and high relative sensitivity across a wide pressure range, making them suitable for manufacturing various piezoelectric pressure sensors and anisotropic bending sensors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
Lidong Feng, Xinchao Bian, Gao Li, Xuesi Chen
Summary: By investigating the thermal properties, morphology, and thermal stability of PLLA/PDLA blends, a new stereoamorphous mesophase (sam-PLA) structure was discovered, and the relationship between different phases in the PLLA/PDLA blends was explored.
Article
Biochemistry & Molecular Biology
Tiantang Fan, Jingwen Qin, Jiafeng Li, Jifa Liu, Ying Wang, Qing Liu, Tianyun Fan, Fengzhen Liu
Summary: The study introduces flexible p-dioxanone (PDO) and highly reactive glycolide (GA) units into poly(L-lactic acid) (PLLA) to prepare poly(L-lactide-ran-p-dioxanone-ran-glycolide) (PLPG) copolymers. The copolymers are then processed into PLPG scaffolds using 3D printing technology. The results show that introducing PDO and GA units improves the mechanical and degradation properties of the PLLA scaffolds, and the PLPG scaffolds support cell proliferation, growth, and differentiation. The controllable degradation rates and mechanical performance of the PLPG scaffolds make them potentially useful in bone tissue engineering.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
Steffen M. Weidner, Andreas Meyer, Jana Falkenhagen, Hans R. Kricheldorf
Summary: This study investigated the polycondensation of ethyl l-lactate (ELA) using seven different tin catalysts and other compounds. The results showed successful synthesis of polylactide (PLA) and revealed the formation of polycondensation and cyclic structures through loops on the surface of crystallites in the solid state.
Article
Cell & Tissue Engineering
Yu Ri Hong, Tae-Ho Kim, Kyeong-Hyeon Park, Jumi Kang, Kyueui Lee, Eui Kyun Park, Tae-Geon Kwon, Jeong Ok Lim, Chang-Wug Oh
Summary: A ready-to-use bone substitute was developed by conjugating bone morphogenetic protein-2 (BMP-2) with a three-dimensional poly(L-lactide) (PLLA) scaffold using novel molecular adhesive materials, reducing operation time and sustaining BMP-2 release. The PLLA scaffold conjugated with 2 μg/ml of BMP-2 demonstrated optimal bone regeneration, highlighting its potential as a novel bone substitute.
TISSUE ENGINEERING AND REGENERATIVE MEDICINE
(2023)
Article
Chemistry, Physical
Sk Shamim Hasan Abir, Julio E. Trevino, Bhupendra B. Srivastava, Muhtasim Ul Karim Sadaf, Julia I. Salas, Karen Lozano, Mohammed Jasim Uddin
Summary: In recent years, there has been great potential in the optoelectronic and flexible nanogenerator applications of inorganic perovskite materials. This study successfully synthesized inorganic perovskite nanocrystals with blue to green tunable photoluminescence and fabricated flexible piezoelectric nanogenerators. The experiments demonstrated that the green perovskite nanocrystals had higher voltage and current outputs compared to the blue perovskite nanocrystals.
Article
Materials Science, Multidisciplinary
Jorge L. Olmedo-Martinez, Luca Porcarelli, Gregorio Guzman-Gonzalez, Itxaso Calafel, Maria Forsyth, David Mecerreyes, Alejandro J. Muller
Summary: This article investigates the blending strategy of PEO with PLA in solid-state lithium batteries to extend their use at high temperatures (100 degrees C). The addition of PLA enhances the mechanical properties of the electrolytes and leads to higher ionic conductivities at elevated temperatures.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Engineering, Multidisciplinary
Tianyi Zheng, Yingjie Yu, Yanyun Pang, Daixing Zhang, Yue Wang, Hongyang Zhao, Xu Zhang, Huijie Leng, Xiaoping Yang, Qing Cai
Summary: The reconstruction of the local electrical microenvironment is an effective strategy for bone regeneration. CMBT nanofibers composited with PLLA showed enhanced piezoelectricity, osteogenic activity, antibacterial, and anti-inflammatory activities, making them promising candidates for bone regeneration and function reconstruction.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Biochemistry & Molecular Biology
Fen Ma, Chenguang Jiang, Wenyuan Xie, Defeng Wu
Summary: Using polysaccharide nanocrystals, such as chitin nanocrystals, as nanofillers for biodegradable aliphatic polymers is an attractive method for developing fully degradable nanocomposites. The incorporation of chitin nanocrystals in poly(L-lactide)/poly(D-lactide) blends promotes the formation of stereocomplex crystallites and accelerates overall crystallization kinetics. The nanocomposites exhibit higher stereocomplex crystallization temperatures and lower activation energy compared to the blend. However, the presence of chitin nanocrystals reduces the fraction of stereocomplex crystallites due to the nucleation effect, despite an increased rate of homocrystallization. This study provides valuable information for the use of chitin nanocrystals as nucleators for polylactide stereocomplexes.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Engineering, Biomedical
Emilio Omar Bachtiar, Virginia Cary Ritter, Ken Gall
Summary: The recent growth of polymer 3D-printing in medical implants has led to the creation of complex porous structures, with annealing revealing a structure-property relationship in PLCL. Crystallization was found to be a crucial factor in mechanical properties, while scaffolds maintained integrity for up to 8 weeks before reaching critical molecular weight and losing mechanical properties.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Engineering, Environmental
Nicolo Mauro, Mara Andrea Utzeri, Alice Sciortino, Marco Cannas, Fabrizio Messina, Gennara Cavallaro, Gaetano Giammona
Summary: In this study, we propose a method for synthesizing carbon nanodots-poly(D,L-lactide) (CDs-PLA) nanocomposites through a reactive melt-extrusion process. The resulting material is suitable for 3D printing applications and exhibits both degradation resistance and fluorescence emission properties. Our findings pave the way for the design of fluorescent implants capable of real-time localization and monitoring of degradation state.
CHEMICAL ENGINEERING JOURNAL
(2022)
