Review
Polymer Science
Euphrasie Jasinski, Veronique Bounor-Legare, Aurelie Taguet, Emmanuel Beyou
Summary: The study investigates the influence of halloysite nanotubes as carriers of flame retardant systems on the fire retardancy performances of polymer-based composites, aiming for long-term aging properties.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Polymer Science
Xuan-Yu He, Ting Wang, Zhong-Cheng Pan, Abdul Qadeer Dayo, Jun Wang, Wen-Bin Liu
Summary: In this article, a novel multifunctional benzoxazine monomer MB-FH was successfully synthesized with high reaction efficiency and short reaction time. The introduction of hydroxyl groups greatly improved the curing and thermal properties of polybenzoxazine.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Materials Science, Composites
Li Yuan, Tian Pan, Guozheng Liang, Aijuan Gu
Summary: Three-dimensional structures were constructed during the fabrication process of glass-fiber-reinforced thermosetting cyanate ester/bismaleimide composites. A self-stitching technique was developed to aid in the crack self-healing of the composites. The mechanical properties of the composites were significantly improved by the 3D structures. The healing efficiency of the composites reached 96%.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
Eleonore Mathis, Marie-Laure Michon, Claude Billaud, Caroll Vergelati, Nigel Clarke, Jacques Jestin, Didier R. Long
Summary: The present study proposes a quantitative approach for predicting and controlling the final morphology of thermosets toughened by high-T-g thermoplastics. By controlling the degree of curing and the T-g of the blend and both phases during phase separation, the desired sizes can be obtained. This research is of great importance for designing blends with tailored morphologies.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Munju Goh, Haeun Shin, Chae Bin Kim
Summary: This study presents a simple method of improving bond exchange rates by incorporating fillers into a model vitrimer, thereby accelerating thermally activated bond exchange reactions. The addition of hexagonal boron nitride effectively reduces activation energy and relaxation time, showing promising results for enhancing the macroscopic properties of vitrimers.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Nobuyuki Odagiri, Keiichi Shirasu, Yoshiaki Kawagoe, Gota Kikugawa, Yutaka Oya, Naoki Kishimoto, Fumio S. Ohuchi, Tomonaga Okabe
Summary: The study reveals that higher stoichiometric ratio samples enhance material ductility, while lower stoichiometric ratio samples primarily exhibit branched molecular structures.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Zi Wen Cui, Yuan Rong Jing, Su Su Liu, Guang Yong Liu
Summary: The mechanical properties, thermal stability, micromorphology, and melt flowability of TPU/MVQ TPVs vulcanized by different peroxide crosslinking agents were systematically investigated. TPVs vulcanized by DBPH showed better overall performance, with improved mechanical properties, thermal stability, aging resistance, and better dispersion of MVQ rubber particles. The melt flow rate of TPVs had a linear relationship with increasing DBPH dosage, but deteriorated after exceeding 1.5 phr of the crosslinking agent. Overall, TPVs performed better when using DBPH as the crosslinking agent at a dosage of 1.5 phr.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Natalia Cano Murillo, Media Ghasem Zadeh Khorasani, Dorothee Silbernagl, Marc Benjamin Hahn, Vasile-Dan Hodoroaba, Heinz Sturm
Summary: Thermoplastic modified thermosets with added nanofillers, such as nanosized boehmite particles, have shown improved fracture toughness. A nanomechanical study of two composite systems revealed that a polycarbonate phase loaded with boehmite nanoparticles significantly enhanced the mechanical properties of the epoxy resin phase, surpassing the rule of mixture.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Kayla R. Sweet, Joseph F. Stanzione
Summary: Polymer networks can be customized using dual-functional monomers, resulting in unique thermal, mechanical properties such as enhanced stiffness and toughness. This approach allows for the creation of tailored polymer materials with excellent performance characteristics.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Mollie B. Schear, Arianna Neal, Jadah S. Clarke, Andrew P. Saab, Carl B. Giller, Riccardo Casalini, Matthew Laskoski
Summary: Highly aromatic elastomers were prepared from a bisphenol A-based divinyl-terminated resin by room temperature hydrosilylation reaction with various aromatic silane containing compounds. These polymers exhibited high thermal and oxidative stability, with a hardness increasing with the addition of more aromatic groups.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Jiajia Ye, Zilin Fan, Shuai Zhang, Xiaobo Liu
Summary: The copolymerization of melamine-based benzoxazine resin (MBF) with epoxy resin E51 was carried out to improve the dielectric properties. It was found that the active functional groups in MBF could catalyze and copolymerize with E51, forming uniform copolymers poly(MBF-E) at various proportions. With the increase of epoxy resins, the water absorption and polarity of the copolymers decreased, and the dielectric constant decreased from 3.67 for poly(MBF) to 2.94 for poly(MBF-60E). Additionally, the tensile strength and elongation at break values increased significantly due to the higher crosslinking density and more flexible ether bond formed.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Miyuki Harada, Yusuke Kawasaki
Summary: A diphenylcyclohexene-type liquid crystalline epoxy was successfully synthesized and characterized. The study found that the synthesized epoxy maintained a stable liquid crystalline phase over a wide temperature range and the fracture toughness and thermal conductivity increased with the size and volume fraction of the liquid crystalline domains.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Composites
Hendrik Moellers, Carsten Schmidt, Dieter Meiners
Summary: This study examined a spray binder and preforms made with the binder and non-crimp carbon fiber textiles. The spray process was analyzed and compared to other binder systems through T-peel and three point flexural tests. While the spray binder demonstrated higher peel strength, its flexural strength was lower than that of powder binder systems.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Composites
Ivan Perez, Samuel Flores, Cesar Ortiz, Miguel Rivero, Jose Emilio Corona, Andres Ivan Oliva, Francis Aviles
Summary: The dispersion state of multilayer graphene sheets in polymers significantly affects the properties of nanocomposites. By adjusting roller gaps and processing cycles, smaller and more densely packed agglomerates can be achieved, impacting the electrical conductivity and mechanical properties of the nanocomposites. The density of agglomerates plays a key role in governing the piezoresistive sensitivity.
POLYMER COMPOSITES
(2022)
Article
Polymer Science
Chulmin Youn, Hyeon Jung Gwak, Younghwan Bae, Dokun Kim, Byeong Jin Yeang, Song Jun Doh, Sang Young Yeo
Summary: This study investigated the effect of thermal drawing process on the mechanical properties of PEI filaments. The results showed that optimizing the draw ratio, process temperature, and cooling temperature can lead to PEI filaments with excellent mechanical properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Psychiatry
Sarah Pheik Hoon Khor, Catherine Margaret Fulgoni, Deborah Lewis, Glenn A. Melvin, Anthony F. Jorm, Katherine Lawrence, Bei Bei, Marie Bee Hui Yap
Summary: The study found that the Therapist-assisted Online Parenting Strategies intervention improved parenting behaviors, parental self-efficacy, parent-adolescent attachment, while reducing impairments to family functioning and parent distress. However, no significant changes were observed in adolescent anxiety, depression, and sleep outcomes.
AUSTRALIAN AND NEW ZEALAND JOURNAL OF PSYCHIATRY
(2022)
Article
Psychology, Developmental
Genevieve Le Bas, George Youssef, Jacqui A. Macdonald, Samantha Teague, Richard Mattick, Ingrid Honan, Jennifer E. McIntosh, Sarah Khor, Larissa Rossen, Elizabeth J. Elliott, Steve Allsop, Lucinda Burns, Craig A. Olsson, Delyse Hutchinson
Summary: This study examined the impact of mother-to-infant bonding on infant development in a multi-wave longitudinal pregnancy cohort study. The results showed that a mother's perceived emotional connection with her child played a role in predicting social-affective outcomes, but had only small effects on cognitive, language, and motor development.
JOURNAL OF THE AMERICAN ACADEMY OF CHILD AND ADOLESCENT PSYCHIATRY
(2022)
Article
Biochemistry & Molecular Biology
Nguyen-Duc Le, Mikaela Trogen, Russell J. Varley, Michael Hummel, Nolene Byrne
Summary: Producing carbon fiber from bio-based or renewable resources has attracted much attention in recent years. The stabilization process, which transforms the precursor fiber to withstand high temperatures, is a critical step. This study used thermogravimetric analysis to explore different stabilization profiles and investigated the influence of atmosphere, cellulose-lignin composition, and catalysts on carbon yield and stabilization rate. It was found that a phosphorus-based flame retardant greatly enhanced the char yield, doubling the amount produced.
Article
Polymer Science
Samuel R. Swan, Claudia Creighton, James M. Griffin, Bekim V. Gashi, Russell J. Varley
Summary: This study investigates the differences between glycidyl ether and glycidyl amine crosslinked networks and compares the structure/property relationships of these networks in depth. The results show that despite some reduced mechanical and thermal properties, the NNE epoxy resin system is a very thermally stable high temperature epoxy resin suitable for a wide range of new applications.
Article
Chemistry, Physical
Jaehoon Choi, Omid Zabihi, Russell Varley, Jane Zhang, Bronwyn L. Fox, Minoo Naebe
Summary: Structural batteries made of carbon fiber composites have attracted significant attention in automotive applications. However, the electrolyte used in these batteries typically relies on highly volatile liquid electrolytes, which limits their performance. This study proposes a new type of structural battery electrolyte that is a two-phase system formed through reaction-induced phase transition. It combines a low flammability electrolyte with a solid additive to induce multihydrogen bonding. The optimized electrolyte demonstrates good ionic conductivity at ambient temperature and shows potential for application in carbon fiber composite structural batteries.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Salumeh Issazadeh, Seyed Mohsen Seraji, Masihullah Jabarulla Khan, Houlei Gan, Luke C. Henderson, Russell J. Varley
Summary: This study investigates the cure kinetics, thermal and mechanical properties, and fire resistance of a carbon fibre composite with a polymer matrix blend. The addition of modifiers in the matrix affects the reaction mechanism and final properties of the composite. Post-curing improves the performance of the composite, particularly in terms of fire resistance.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
J. Choi, O. Zabihi, R. J. Varley, B. Fox, M. Naebe
Summary: Solid polymer electrolytes with cyclohexanedimethanol as a solid additive show improved ionic conductivity in epoxy-based electrolyte systems. The Li15-CHDM30 formulation exhibits the highest ion conductivities and mechanical properties, outperforming electrolyte systems containing succinonitrile and polycarbonate additives.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Polymer Science
Samuel R. Swan, Houlei Gan, Claudia Creighton, James M. Griffin, Bekim Gashi, Russell J. Varley
Summary: This study investigates the impact of molecular fortifiers on the mechanical and thermal properties of a highly aromatic and rigid epoxy monomer. The fortifiers are found to improve the processability and cure conversion of the material. They also reduce moisture ingress and increase modulus, but with limited improvement in toughness.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Seyed Mohsen Seraji, Houlei Gan, Nguyen-Duc Le, Juan Zhang, Russell J. Varley
Summary: This study investigated the effect of a phosphorus-based fire retardant on the thermal, rheological, mechanical properties, and flammability of an epoxyamine network. Increasing the concentration of the flame retardant improved fire resistance but reduced reactivity and thermal/mechanical properties. However, an excess amino stoichiometry had a comparatively positive effect on reactivity and thermal/mechanical properties.
POLYMER INTERNATIONAL
(2022)
Article
Engineering, Chemical
Masihullah Jabarulla Khan, Claudia Creighton, Russell J. Varley
Summary: This study investigates the shrinkage during cure of a rapid curing epoxy/cycloaliphatic amine system. A volumetric shrinkage model considering chemical shrinkage, thermal and physical changes, and cure conversion is proposed. The model provides a valuable tool for predicting shrinkage during cure and designing cure profiles to minimize residual stress.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Review
Green & Sustainable Science & Technology
N. -D. Le, R. J. Varley, M. Hummel, M. Trogen, N. Byrne
Summary: This paper discusses the challenges of manufacturing carbon fiber from lignin, cellulose, and blends thereof, and introduces strategies to address these challenges. Advanced bio-based precursors and emerging blended fibers, as well as their transformation into sustainable carbon fibers, are also presented and discussed.
MATERIALS TODAY SUSTAINABILITY
(2022)
Review
Mechanics
Srinivas Nunna, Anil R. Ravindran, Jens Mroszczok, Claudia Creighton, Russell J. Varley
Summary: Carbon fibres and their composites are highly valued for their excellent tensile properties and light weight, but their performance under compression loading has been a major obstacle to wider usage. This review discusses the reasons for this deficiency and provides suggestions on how to improve the compressive properties of carbon fibre and carbon fibre composites.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Chemical
Sima Kashi, Mandy De Souza, Claudia Creighton, Salwan Al-Assafi, Russell Varley
Summary: This study investigates the role of a phenolic antioxidant in limiting the thermo-oxidative degradation of PAG and studies the kinetics of antioxidant depletion in PAG. The results show that adding an antioxidant can significantly improve the thermal stability of PAG.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Polymer Science
Esfandiar Pakdel, Masihullah Jabarulla Khan, Nguyen Le Thao Nguyen, Maxime Maghe, Russell J. Varley
Summary: This research enhances the fire-retardancy of acrylic yarns by controlling the oxidation temperature and residence period. The oxidised yarns show excellent fire retardancy and can be woven into a non-combustible fabric. This presents a novel pathway for the development of low cost, non-combustible fabric.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Salumeh Issazadeh, Masihullah Jabarulla Khan, Houlei Gan, Juan Zhang, Luke C. Henderson, Russell J. Varley
Summary: This work presents the synthesis and characterization of highly aromatic bisoxazoline monomers with diphenyl ether, furan, and thiophene backbones. The impact of these moieties on polymerization and glass transition temperatures is studied through cure and reaction kinetics investigations. Two catalysts, methyl triflate and dodecyl benzene sulfonic acid, are used to explore their role in controlling the cationic ring-opening polymerization mechanism. The polymerization process is monitored and characterized using differential scanning calorimetry and kinetic modeling.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
