Article
Materials Science, Textiles
Yanping Hao, Jun Chen, Fan Wang, Yang Liu, Xue Ai, Hongchi Tian
Summary: In this study, a series of crosslinked poly(lactic acid) (PLA) with different gel fractions were prepared by adding small amounts of bis(tert-butyl dioxy isopropyl) benzene (BIBP) and triallyl isocyanurate (TAIC). The rheological properties, crystallization behavior and thermal stability of the samples were investigated, showing that crosslinked structures were formed according to the gel fraction and molecular weight. The crosslinked structures played a role in increasing modulus, complex viscosity, and enhancing the crystallization temperature, while crosslinking also had a positive effect on the thermal stability of PLA.
FIBERS AND POLYMERS
(2022)
Article
Polymer Science
Yanping Hao, Hongchi Tian, Jun Chen, Qingkui Chen, Huanling Qiu, Weiwei Zhang, Huili Yang, Huiliang Zhang
Summary: It was found that blending bis(tert-butyl dioxy isopropyl) benzene (BIBP) with poly(lactic acid)/vinyl acetate ethylene (PLA/VAE) blend greatly improved the compatibility and properties of the blend. The addition of BIBP led to the formation of crosslinked structures, reducing particle size and increasing interfacial adhesion. The mechanical properties and thermal stability of the blend were significantly improved with an appropriate content of BIBP.
IRANIAN POLYMER JOURNAL
(2023)
Article
Materials Science, Composites
Tej Singh, Laszlo Lendvai, Gabor Dogossy, Gusztav Fekete
Summary: The study found that increasing wood waste content resulted in certain properties of the composite materials increasing, such as modulus, porosity, and water absorption, while other properties decreased such as density, tensile strength, impact strength, and stress at break. However, the flexural strength of the composites remained relatively constant. Differential scanning calorimetry analysis showed that wood waste helped increase the glass transition and cold crystallization temperature of PLA composites.
POLYMER COMPOSITES
(2021)
Article
Biochemistry & Molecular Biology
Ewa Olewnik-Kruszkowska, Magdalena Gierszewska, Sylwia Grabska-Zielinska, Joanna Skopinska-Wisniewska, Ewelina Jakubowska
Summary: This study aimed to obtain a series of new crosslinked chitosan-based films using the solvent casting method, with squaric acid as a safe crosslinking agent. The addition of squaric acid significantly improved the structural, mechanical, thermal, and swelling properties of the formed films, establishing squaric acid as an effective crosslinking agent for chitosan-based materials.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Physical
Monica Vidotto, Branka Mihaljevic, Gordana Zauhar, Elvira Vidovic, Nadica Maltar-Strmecki, Damir Klepac, Srecko Valic
Summary: This study investigated the effects of gamma-radiation on PLA, a biodegradable polymer with wide applications. Results showed that the concentration and decay rate constant of radicals in PLA depend on the absorbed dose. Additionally, irradiated PLA exhibited a loss of material elasticity and an increase in brittleness with increasing absorbed dose.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Shiling Jia, Yunjing Chen, Junjia Bian, Hongwei Pan, Xiangyu Wang, Ling Zhao, Lijing Han, Huiliang Zhang, Lisong Dong, Huixuan Zhang
Summary: Blends of Poly(L-lactic acid) (PLLA) with excellent low-temperature toughness and strength were prepared by melt compounding with acrylic ester based impact resistance agent (AEIR). The addition of AEIR dramatically improved the toughness of PLLA in a wide temperature range, especially at low temperatures, while maintaining high tensile strength.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Polymer Science
Eduardo Ruiz-Silva, Mirleth Rodriguez-Ortega, Luis Carlos Rosales-Rivera, Francisco Javier Moscoso-Sanchez, Denis Rodrigue, Ruben Gonzalez-Nunez
Summary: Blends of PLA/LMDPE with different weight ratios were prepared using rotational molding and two mixing strategies, DB and MB. Thermal, morphological, and mechanical analyses showed that the blends' thermal stability, morphology, and mechanical properties were affected by the blending technique. DB generated larger particle sizes compared to MB, and blends with different PLA contents exhibited synergistic effects in tensile and flexural properties.
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
Brandon B. Risley, Xiaochu Ding, Ying Chen, Paula G. Miller, Yadong Wang
Summary: PGS requires harsh thermal crosslinking conditions, while the addition of citric acid can enhance the mechanical properties by forming PGSC. It is found that low citrate content and short curing time can produce PGSC with good cytocompatibility, making it a potential candidate for biomedical applications.
MACROMOLECULAR BIOSCIENCE
(2021)
Article
Polymer Science
Xin Zhang, Biao Yang, Baomin Fan, Hui Sun, Huijuan Zhang
Summary: Using D-sorbitol as a nucleating agent via melt blending can enhance the crystallization and heat resistance of Poly(L-lactic acid) (PLLA), with the crystallinity exceeding 50% and the heat deflection temperature elevated from 56 to 132 degrees C. The presence of polymorphic crystals during melt crystallization suggests that D-sorbitol promotes PLLA crystallization via a homogeneous nucleation mechanism.
Article
Thermodynamics
Adriana Nicoleta Frone, Dora Dominica Baciu, Marius Stelian Popa, Cristian Andi Nicolae, Augusta Raluca Gabor, Monica Florentina Raduly, Radu Claudiu Fierascu, Denis Mihaela Panaitescu
Summary: This study proposes a facile method to improve the performance of PLA for biomedical applications by incorporating different mass proportions of POSS nanoparticles with AH-POSS substituent using a melt-blending technique. The results show that AH-POSS has simultaneous nucleation and plasticizing effects on PLA nanohybrids, enhancing thermal resistance and easy control of crystallinity while maintaining PLA's biocompatibility. An interesting effect of AH-POSS on the mechanical properties of PLA at body temperature is observed. The PLA/AH-POSS nanohybrids obtained by melt compounding show considerable potential in the fabrication of biomedical devices.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Engineering, Environmental
Izabela Kondratowicz, Ibrahim Shalayel, Malgorzata Nadolska, Seiya Tsujimura, Yoshifumi Yamagata, Isao Shitanda, Abdelkader Zebda
Summary: Chitosan, a linear polysaccharide, is of great interest for biomedical applications. It is important to study the effect of additives on the properties of chitosan, and various material combinations can help enhance its performance.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Materials Science, Composites
Lisha Zhao, Xuhua Liu, Yanhua Cai, Wei Chen
Summary: This study evaluated the potential effects of BCADD as an additive in PLLA, and found that BCADD acted as a heterogeneous nucleus to facilitate PLLA crystallization. However, excessive loading of BCADD weakened the crystallization ability of PLLA. Cooling rate and final melting temperature were important factors in the melt-crystallization process, and a higher cooling rate had a negative impact on the crystallization ability of BCADD-nucleated PLLA. The chemical nucleation mechanism and melting behaviors further confirmed the crystallization accelerating role of BCADD and its influence on PLLA properties.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Han-Seung Ko, Sangwoon Lee, Doyoung Lee, Jae Young Jho
Summary: By introducing PGA fibers and HA into PLA composites and modifying HA, the tensile and flexural strength of PLA/HA-g-PLA composites were improved, along with enhancing the interfacial adhesion between HA and the PLA matrix.
Article
Biochemistry & Molecular Biology
Kun Chen, Cheng Zhou, Lan Yao, Mengfan Jing, Chuntai Liu, Changyu Shen, Yaming Wang
Summary: Poly(lactic acid) (PLA) based ternary blends were prepared and the phase structures and mechanical properties were investigated. The PLA/PCL/EMA-GMA (80/5/15) blend exhibited the best elongation at break and impact toughness among all compositions, and showed excellent stiffness-toughness balance. The formation of core-shell structures and interfacial adhesion contributed to the toughening mechanism in the ternary blends. This study provides guidance for the preparation and design of partially renewable supertough materials based on PLA that can compete with conventional petro-derived plastics.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Engineering, Chemical
Chana Prapruddivongs, Thapanee Wongpreedee
Article
Materials Science, Multidisciplinary
Benjatham Sukkaneewat, Thidatip Panrot, Porntip Rojruthai, Thapanee Wongpreedee, Chana Prapruddivongs
Summary: This research investigated the possibility of citric acid crosslinking starch-based foam in the presence of palm oil and sorbitol plasticizer. The results showed that citric acid loading affected the flexural strength of the foams and led to improved thermal stability and reduced water solubility. The new foam material, prepared by citric acid incorporation, displayed potential for biodegradable trays and plates as alternative environmentally friendly options.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Applied
Thapanee Wongpreedee, Thidatip Panrot, Porntip Rojruthai, Chana Prapruddivongs
Summary: A simple method of preparing low water-soluble citric acid crosslinking starch-based foam was established, in which the boiling citric acid solution was poured into the starch compound instead of using the conventional solution casting method. The addition of citric acid resulted in decreased thermal stability and increased density and cell wall thickness of the foam.
JOURNAL OF CELLULAR PLASTICS
(2022)