Article
Polymer Science
Adrian Korycki, Christian Garnier, Amandine Abadie, Valerie Nassiet, Charles Tarek Sultan, France Chabert
Summary: The study elaborated PEEK/PES blends with partial miscibility by melt mixing with phenolphthalein, which was confirmed by DSC and DMTA analysis. Phenolphthalein acted as a compatibilizer and plasticizer for the blends, resulting in a softened PEEK phase and improved interfacial adhesion with PES. Additionally, the storage modulus in the glassy region of the blends remained similar to pure PEEK due to the aromatic moieties in phenolphthalein.
Article
Polymer Science
Gorkem Yildiz, Meral Akkoyun
Summary: The study found that adding different concentrations of BN and AlN fillers can significantly improve the thermal conductivity of PA6, slightly improve the electrical conductivity, and also improve the thermal stability, but the tensile strength slightly decreases.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Review
Polymer Science
Adrian Korycki, Fabrice Carassus, Olivier Tramis, Christian Garnier, Toufik Djilali, France Chabert
Summary: This review presents the current research status of polyaryletherketone-based thermoplastic blends (PAEK). Blending PAEK with other thermoplastic polymers offers the possibility to obtain materials with novel properties, but the lack of knowledge on the structure/morphology/property relationships poses a significant challenge for further development in this field.
Article
Materials Science, Composites
Shihua Xu, Shunmin Yi, Yiqun Fang, Xin Yi, Peng Xu
Summary: In this study, PA12 and PBO were used to modify PA11, and MCC reinforced PA11 composites were prepared via hot pressing. The addition of PA12 improved the toughness of the composites, while PBO elongated the molecular chains of the PA11/PA12 blends and positively affected the mechanical properties. MCC significantly increased the flexural strength and modulus of the composites.
POLYMER COMPOSITES
(2022)
Article
Polymer Science
Jiang Zhang, Wenbing Hu
Summary: Polyamides rely on specific hydrogen-bonding interactions for their crystallization, which have been found to play important roles in both thermodynamics and kinetics. Increasing the density and strength of hydrogen bonds accelerates the crystallization and growth of lamellar crystals. However, excessively strong hydrogen bonds can slow down the crystallization kinetics. Additionally, specific interactions have been found to have dominant roles in the hierarchical parallel packing of polymer chains.
Review
Biotechnology & Applied Microbiology
Mostafa Eesaee, Payman Ghassemi, Dinh Duc Nguyen, Sabu Thomas, Said Elkoun, Phuong Nguyen-Tri
Summary: Polyhydroxyalkanoates (PHAs) have emerged as a biodegradable alternative to petrochemical-based plastics. They are mainly produced from microorganisms and have shown great potential in medical and pharmaceutical applications. However, there are several drawbacks associated with PHAs, such as brittleness and thermal instability. Therefore, modifications are necessary to improve their properties. Blending with other materials and adding additives/reinforcements are the major approaches in modifying PHAs. Understanding the morphology and crystallization behavior of PHA-based blends and composites is crucial for controlling their properties.
BIOCHEMICAL ENGINEERING JOURNAL
(2022)
Article
Polymer Science
Nadya Vasileva Dencheva, Joana Filipa Barros Braz, Zlatan Zlatev Denchev
Summary: This study presents a facile method for synthesizing pure, hybrid, and copolymeric microparticulate materials for additive manufacturing via anionic ring-opening polymerization in solution. The synthesized materials demonstrate different characteristics based on reaction time and temperature, with the potential for use in additive manufacturing processing. The materials show promising mechanical properties, indicating their suitability for applications in the additive manufacturing industry.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Hye-Seon Park, Chang-Kook Hong
Summary: Poly (l-lactic acid) (PLLA) is a promising biomedical polymer material with a wide range of applications. By blending PLLA with different amounts of poly (d-lactic acid) (PDLA) through a melt blending process, the study systematically investigated the effect of PDLA on the crystallization behavior, thermal, and mechanical properties of PLLA. The results showed that increasing PDLA content led to easier formation of stereocomplexes, increased crystallinity, and enhanced mechanical strength in the PLLA/PDLA blends.
Article
Polymer Science
Xinchao Wang, Yapeng Sun, Jiale Hu, Lan Wu, Tie Geng, Yonggang Guo, Chenhao Zhao, Binbin Dong, Chuntai Liu
Summary: This study aimed to improve the thermal stability of polycarbonate (PC) foam by adding glass fibers (GF) and investigate their effects on PC crystallization behavior and foam cell morphology. The addition of GF enhanced the SC-CO2-induced crystallization stability and increased the cell density to 4.6 cells/cm³. The thermal stability of PC/GF foam was improved, with higher residual carbon rate and lower weight loss rate compared to PC matrix. This study highlights the potential of GF as a reinforcement for PC foam and provides guidance for industrial production and applications.
Article
Polymer Science
Zhe Wang, Na Lin, Hongliang Kang, Xinmin Hao, Ruigang Liu
Summary: The miscibility, crystallization behaviors, and morphology of polyamide 56/polyamide 6 (PA56/PA6) blends were studied. The results showed that PA56 and PA6 were miscible in the blends, evident from the presence of only one glass transition temperature (Tg). The interaction between PA56 and PA6 in the blends led to a depression in the melting point, crystallization temperature, and crystallinity of the blends. Both PA56 and PA6 maintained their crystalline structure and crystallized separately in both isothermal and non-isothermal crystallization processes. PA56 crystallized in all blending ratios, while PA6 only crystallized with a PA6 content of phi 6 > 0.2. The crystals of PA56 and PA6 grew in the same crystal skeleton but in different layers. The addition of a small amount of PA6 in PA56 significantly improved the elongation at break without sacrificing the strength, indicating a promising approach for fabricating polyamide materials with desired properties.
Article
Polymer Science
Anna Raffaela de Matos Costa, Juliana Cysneiros Lima, Raquel dos Santos, Lhaira Souza Barreto, Mariana Alves Henrique, Laura Hecker de Carvalho, Yeda Medeiros Bastos de Almeida
Summary: This study investigates the rheological, morphological, and thermal properties of composites with different compositions, showing that thermal stability and degradation during processing are dependent on matrix composition and filler concentration. SEM images reveal partial adhesion of filler to matrices and filler pullout, while optical microscopy demonstrates particle agglomeration increasing with filler content. FTIR analysis indicates a shifting of absorption bands and selective dispersion of RHA through hydrogen bonding, supporting the idea of developing polymer composites with improved properties using the filler employed in this study.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Hao-hao Ren, Peng-cheng Li, Ya-nan Wu, Jin-bo Hu, Gang Zhang, Yong-gang Yan
Summary: A series of semi-aromatic copoly(ether ether amide)s were synthesized with varying levels of hydroquinone content. The introduction of hydroquinone improved the corrosion resistance of the copolymers, especially those with higher hydroquinone content. The copolymers exhibited good thermal and mechanical properties, with potential applications in corrosion-resistant materials.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Cong Yan, De-Fa Hou, Kai Zhang, Ming-Bo Yang
Summary: The molecular weight of poly(D-lactide) (PDLA) and poly(L-lactide) (PLLA) is important for the performance of their blends. In this study, the crystallization and rheological properties of asymmetric PDLA/PLLA blends were studied considering the molecular weight of PDLA. The results showed that an optimal molecular weight of PDLA led to the formation of stereocomplex (SC) crystals and improved viscosity and tensile properties of the blend.
Article
Chemistry, Multidisciplinary
Yoldas Seki, Elif Kizilkan, Berkay Metin Leskeri, Mehmet Sarikanat, Lutfiye Altay, Akin Isbilir
Summary: The study investigates whether a blend of PPS and SPS (PPS-SPS) can be used as a substitute for PPS in applications requiring high thermal stability, high mechanical performance, and high thermal conductivity. Carbon-based fillers, such as carbon fiber and synthetic graphite, were used to improve the mechanical properties and thermal conductivity of the blend. The results show that carbon-loaded composites based on PPS-SPS blend have the potential to be used in thermal management applications with the advantages of low cost and lightweight compared to PPS-based composites.
Review
Polymer Science
Sarang S. Shindalkar, Shankar S. Humbe, Girish M. Joshi, C. Ramesh Kumar
Summary: This review focuses on the tribological performance of polytetrafluoroethylene (PTFE, commonly known as Teflon) derived blends and composites at different grades, and details the optimized casting process and rational design principles. The desired wear rate and excellent thermal conductivity of actual Teflon components are demonstrated through bird's eye view, and the engineering properties of Teflon for future prospects and applications as emerging high-performance thermoplastics are revealed.
POLYMER-PLASTICS TECHNOLOGY AND MATERIALS
(2022)
Article
Statistics & Probability
Dongbang Yuan, Irina Gaynanova
Summary: This study investigates the problem of extracting joint and individual signals from multi-view data, and proposes a double-matched matrix decomposition method. The proposed method allows simultaneous extraction of joint and individual signals across subjects and miRNAs, and demonstrates superior signal estimation performance compared to single-matching methods.
JOURNAL OF COMPUTATIONAL AND GRAPHICAL STATISTICS
(2022)
