Article
Materials Science, Multidisciplinary
Bao Ding, Nadege Follain, Nasreddine Kebir
Summary: Thermosetting biobased shape-memory materials with both shape memory effect and the ability to reconfigure their shape permanently have been successfully prepared. The dynamic disulfide bonds in these materials promote the topological rearrangement of the cross-linked network structure through thermal stimulation, resulting in good thermal stability and mechanical properties.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Courtney M. Laprise, Kelly A. Hawboldt, Francesca M. Kerton, Christopher M. Kozak
Summary: Waste-derived fish oil can be epoxidized and reacted with CO(2) to produce a cyclic carbonate containing material, which can further lead to the formation of nonisocyanate polyurethane materials when reacted with a bioderived amine. The synthesized products are characterized using various spectroscopic and analytical techniques. This process provides a sustainable solution for waste management by utilizing underutilized resources to produce valuable materials.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Gabriela Toader, Aurel Diacon, Edina Rusen, Florica Rizea, Mircea Teodorescu, Paul O. Stanescu, Celina Damian, Adrian Rotariu, Eugen Trana, Florina Bucur, Raluca Ginghina
Summary: This study introduces a novel method for obtaining polyurea-polyurethane-multiwall carbon nanotubes (MWCNTs) nanocomposites with improved mechanical properties, and demonstrates their suitability for ballistic protection through impact tests on aluminum plates. Experimental measurements revealed the enhanced thermal and mechanical properties of these new materials, and the dynamic regime testing showed that the nanocomposite layers allow the metal plate to maintain integrity at a significantly higher force value compared to uncoated specimens.
Article
Materials Science, Composites
Madeha Jabbar, Muhammad Adnan, Khubab Shaker, Tayyaba Abdullah, Yasir Nawab, Rizwan Hussain, A. U. Malik
Summary: Materials scientists are exploring the development of impact-resistant materials, particularly the potential of polyurea-polyurethane hybrid materials. These hybrid materials have distinct chemical structures and cure kinetics, making them a versatile option for addressing the challenge. The study focuses on the development of coated composites using polyurea, polyurethane, and their hybrid as a coating material on glass/epoxy composites to enhance their impact properties. The research highlights the effects of coating thickness, temperature, and the number of coating layers on the mechanical properties of the composites.
POLYMER COMPOSITES
(2023)
Article
Energy & Fuels
Junping Zhou, Kang Yang, Lei Zhou, Yongdong Jiang, Xuefu Xian, Chengpeng Zhang, Shifeng Tian, Maolin Fan, Zhaohui Lu
Summary: This study investigates the influence of sub/super-critical CO2-water exposure on the microstructure and mechanical properties of shale. The results show that CO2 exposure leads to a decrease in carbonate and clay content in shale, while altering pore structures and reducing the mechanical properties of the shale. Additionally, the study finds that greater alterations in the pore structure and mechanical properties are induced by supercritical CO2 compared to subcritical CO2, and these alterations are further enhanced by CO2-water exposure.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Review
Chemistry, Applied
Halima Khatoon, Sajid Iqbal, Mohd Irfan, Abu Darda, Neha Kanwar Rawat
Summary: The article discusses the importance of nonisocyanate polyurethanes (NIPU) and their comparison with traditional polyurethanes; introduces different synthetic methods for green polyurethanes produced using vegetable oil and isocyanates; and extensively examines the production of NIPU and their applications in various fields.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Energy & Fuels
Chunyan Ma, Nan Wang, Nannan Ye, Xiaoyan Ji
Summary: The study compared the CO2 absorption capacity of three hybrid solvents based on [Bmim][OAc] and different cosolvents, with [Bmim][OAc]-DEPG250 showing the highest absorption capacity. The addition of DEPG250 significantly reduced the viscosity while maintaining comparable absorption capacity. Additionally, using [Bmim][OAc]-DEPG250 as a solvent resulted in a lower CO2 capture cost compared to aqueous amine solutions due to reduced utility costs.
Article
Polymer Science
Jing Wang, Jihu Wang, Song Wang, Shaoguo Wen, Kaimin Chen, Chen Xie, Chunping Yuan
Summary: The most notable features of polyurea are its fast reaction, energy-saving, and high efficiency. However, waterborne polyurea (WPUA) with hydrophilic groups has reduced solvent resistance, heat resistance, and mechanical properties. Therefore, the development of high-performance WPUA is necessary. In this study, epoxy-modified waterborne polyurea (WPUAE) emulsions were prepared using epoxy resin as a modifier, improving the comprehensive properties of WPUA.
Article
Thermodynamics
Bing Bai, Hong-jian Ni, Xian Shi, Xing Guo, Lu Ding
Summary: The study reveals that ScCO2 immersion decreases the compressive strength but increases the elastic modulus of shale. ScCO2 alters the mechanical properties of shale through pressure, adsorption, and dissolution, with adsorption being the dominant factor enhancing the elastic modulus.
Article
Construction & Building Technology
Bing Liu, Xuanyu Zhang, Junpeng Ye, Xiaoyan Liu, Zhiheng Deng
Summary: This study investigated the effect of microfibers and macrofibers on the mechanical properties of coral concrete. The results showed that both types of fibers can improve the mechanical properties, with microfibers mainly affecting the stage before macrocracks formation and macrofibers mainly exerting positive effects after macrocracks appeared. The hybrid addition of microfibers and macrofibers further enhanced the mechanical properties.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Polymer Science
Yu Chen, Hui Guo, Minqian Sun, Xiao Lv
Summary: Two types of polyurea materials were prepared and tested for their tensile properties under different strain rates. The mechanical behavior of the materials under dynamic and quasi-static loading was analyzed, and a dynamic visco-hyperelastic constitutive model was established. The research results showed that the tensile properties of polyurea were strain rate sensitive and exhibited different mechanical behaviors under different loading conditions.
Article
Green & Sustainable Science & Technology
Jianzhao Wu, Chaoyong Zhang, Kunlei Lian, Huajun Cao, Congbo Li
Summary: This study analyzes the carbon emission characteristics and proportions of laser, arc, and laser-arc hybrid welding methods. The experimental results show that appropriate welding heat inputs can reduce carbon emissions while maintaining desired tensile properties.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Composites
Praveenkumara Jagadeesh, Madhu Puttegowda, Yashas Gowda Thyavihalli Girijappa, Sanjay Mavinkere Rangappa, Suchart Siengchin
Summary: The study focused on developing Areca/Sisal/Carbon reinforced epoxy hybrid composites with various stacking sequences for railway interior applications, and evaluated their mechanical and morphological properties. The positive results of mechanical tests suggest the potential use of the composites in some railway interior parts. The proper agglomeration of fibers in the matrix influenced better mechanical properties, indicating the promising prospect of natural and synthetic fiber hybridization in polymer matrix for railway interior applications.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Composites
Yashas T. G. Gowda, A. Vinod, P. Madhu, Sanjay Mavinkere Rangappa, Suchart Siengchin, Mohammad Jawaid
Summary: The study focused on hybrid fiber reinforced composites for engineering applications, finding that the carbon/flax composite had better strength and overall performance, making it suitable for lightweight engineering applications.
POLYMER COMPOSITES
(2022)
Article
Green & Sustainable Science & Technology
Yirui Li, Xiaohui Zeng, Ye Shi, Kai Yang, John Zhou, Hussaini Abdullahi Umar, Guangcheng Long, Youjun Xie
Summary: Developing an eco-friendly UHPC with Belite cement is a challenge due to slower mechanical strength development compared to Ordinary Portland cement. However, BC has a lower CO2 footprint and better long-term performance. Comparing with OPC, UHPC-BC shows lower strength at early ages but higher strength after 28 and 90 days of curing. The mechanical strength of UHPC-BC improves significantly after heat curing and exceeds UHPC-OPC. UHPC-BC has a higher flexural strength to compressive strength ratio and lower environmental impact indices at long age.
JOURNAL OF CLEANER PRODUCTION
(2022)
