Article
Polymer Science
Dong Jin Jang, Joo Hyung Lee, Jae Jin Lee, Jieun Hyun, Seong Hun Kim
Summary: In this study, PA6/PEICT blends were successfully prepared by introducing a reactive compatibilizer. The impact strength of the blended material was significantly improved by enhancing the interfacial adhesion between PA6 and PEICT, achieving a level comparable to glass fiber reinforced PA6.
Article
Materials Science, Multidisciplinary
Andre N. Gaduan, Kanjanawadee Singkronart, Catriona Bell, Emma Tierney, Christoph Burgstaller, Koon-Yang Lee
Summary: Ineffective sorting of post-consumer plastics is a major obstacle in plastic recycling. This study demonstrates the use of carbon fibers to improve the mechanical properties of mixed plastics, creating more demand for them in engineering applications. The addition of carbon fibers enhances the tensile, flexural, and fracture toughness of the resulting composite blends. Despite the environmental burden of carbon fiber production, life-cycle analysis shows that CF-reinforced composites have a lower environmental impact compared to doing nothing or repurposing without CF reinforcement, due to their higher mechanical performance.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Andre N. Gaduan, Kanjanawadee Singkronart, Catriona Bell, Emma Tierney, Christoph Burgstaller, Koon-Yang Lee
Summary: Ineffective sorting of post-consumer plastics hinders plastics recycling. This study demonstrates the use of carbon fibers to enhance the mechanical properties of mixed plastics. The incorporation of carbon fibers improves the tensile, flexural, and fracture toughness of the resulting composite blends. Despite the high environmental burden associated with carbon fiber production, life-cycle analysis shows that carbon fiber-reinforced composites have a lower environmental impact than other scenarios. This work creates opportunities for the utilization of mixed plastics in higher value applications, promoting the concept of circular economy.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Bruno de P. Amantes, Renato Jonas B. de Oliveira, Maria de Fatima Marques
Summary: This study investigated blends of polypropylene (PP), polyamide 6 (PA6), and biodegradable polymers (BPs) as compatibilizing agents, producing ternary blends with superior mechanical properties due to better dispersion of the phases. Positive results were observed in the biodegradation test for all samples containing BPs, indicating the potential for environmentally friendly polymer blends.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Yajing Zhang, Mingda Wang, Di Zhang, Yibing Wang, Li Wang, Yongjun Qiu, Liquan Wang, Tao Chen, Liming Zhao
Summary: This study investigated the crystallization behavior of blends of polyamide 4 (PA4) with polyamide 6 (PA6) and copolyamide 4/6 (R46). The results showed the formation of two crystalline phases (PA4- and PA6-rich phases) in the blends, and increasing PA6 content led to increased thermal stability and decreased crystallinity of the PA4-rich phase. The blends with 30-40 wt% PA6 exhibited the best mechanical properties.
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
Chemistry, Multidisciplinary
Valentina Brunella, Beatrice Gaia Rossatto, Domenica Scarano, Federico Cesano
Summary: The research investigates the use of carbon black as a filler to enhance the electrical conductivity of PA66 polymer composites. It was found that carbon black nanoparticles can form conductive pathways, allowing for the application of these composites in touch sensors and devices.
Article
Polymer Science
D. Perin, A. Dorigato, A. Pegoretti
Summary: One of the main limitations of high-performance composite materials is failure due to fatigue crack propagation. Traditional repair methods can be costly and time-consuming, so research in the field of self-healing composites has increased. This study focuses on producing a polyamide 6 (PA6) matrix with self-healing properties by melt compounding cyclic olefinic copolymer (COC) with PA6. The immiscibility and lack of interfacial adhesion between the constituents were observed through scanning electron microscope micrographs. The addition of 30 wt% of COC resulted in a slight decrease in fracture toughness, but led to a healing efficiency of 11% in quasi-static mode and 35% in impact mode.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Maryam Safari, Itziar Otaegi, Nora Aramburu, Yu Wang, Guoming Liu, Xia Dong, Dujin Wang, Gonzalo Guerrica-Echevarria, Alejandro J. Muller
Summary: The study focused on the composition-dependent miscibility of polyamide 6 and biobased polyamide 4,10 blends, showing compatibility in the amorphous and melt states, as well as in a limited composition range in the crystalline state. The blends exhibited single or double crystalline phases based on the PA6 content, both displaying good mechanical properties due to excellent compatibility. Temperature-dependent measurements confirmed the presence of unique crystalline phases in the blends.
Article
Polymer Science
Enrico Carmeli, Seif Eddine Fenni, Maria Rosaria Caputo, Alejandro J. Muller, Davide Tranchida, Dario Cavallo
Summary: This study presents a novel approach for investigating surface-induced nucleation in polymer blends, focusing on the crystallization behavior of dispersed polyethylene droplets in a polypropylene matrix. It was found that increasing the lamellar thickness of polypropylene enhanced the crystallization kinetics of polyethylene, leading to the formation of a transcrystalline layer at the interface. The nucleating effect of polypropylene on polyethylene was estimated to be around 140%, indicating epitaxial growth as the mechanism of surface-induced nucleation in these blends.
Article
Engineering, Manufacturing
Nga Thi-Hong Pham
Summary: The addition of polyamide 6 to thermoplastic polyurethane reduces both elongation and tensile strength. As the content of polyamide 6 increases, the ductility gradually decreases while the hardness slightly increases.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2022)
Article
Polymer Science
Magdalena Gora, Sebastian Coba-Daza, Enrico Carmeli, Davide Tranchida, Andreas Albrecht, Alejandro J. Muller, Dario Cavallo
Summary: In blends of polyethylene (PE) as the minor component dispersed in a polypropylene (PP) matrix, increasing the crystallization temperature of the PP matrix enhances the crystallization rate of PE by promoting epitaxial nucleation at the interface. This study investigates the behavior of different industrially produced PE grades in immiscible blends with PP as the matrix.
Article
Chemistry, Multidisciplinary
Davide Perin, Giada Odorizzi, Andrea Dorigato, Alessandro Pegoretti
Summary: High-performance composites often suffer from fatigue crack propagation, and traditional repair methods are inefficient. Therefore, the development of composites with self-healing capabilities has gained significant attention in the past decade. This study focuses on developing a PA6 matrix with self-healing properties by incorporating PCL as a healing agent. The results demonstrate that the repaired samples show improved healing efficiency under impact conditions.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Composites
Chien-Lin Huang, Hao-Ping Yang, Ji-Yuan Ye, Yang-Chun Fan, Shen-Po Huang
Summary: The addition of graphene nanosheets (GNSs) into immiscible HDPE/PA6 polymers was studied, and the electrical and rheological properties of the resulting composites were investigated. The GNSs were found to be selectively located in the PA6 phase of the composites, and their dispersion and the mixing order played important roles in the formation of the cocontinuous morphology. The addition of GNSs also affected the crystallization kinetics and mechanical properties of the composites.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Zhuyu Bai, Na Wang, Shaopeng Chen, Xincheng Guo, Jianbing Guo, Jun Qin, Xiaolang Chen, Zongcheng Lu
Summary: Silica nanohybrid expandable graphite particles serve as an efficient flame retardant for polypropylene/polyamide 6 blends, enhancing flame retardancy, thermal stability, and mechanical properties. Compared to pure expandable graphite, the nanohybrid particles exhibit improved flame retardant efficiency and better thermal stability in the composites.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
