Article
Polymer Science
Sayyeda Marziya Hasan, Tyler Touchet, Aishwarya Jayadeep, Duncan J. Maitland
Summary: This study investigates the effects of altering the concentration of a chemical blowing agent on the morphology, thermal and chemical properties, and actuation rates of amorphous shape memory polymer foams. Lower blowing agent concentration results in thicker foam struts and higher tensile modulus, while also reducing the strain at break and glass transition temperature. The findings provide an approach to control the foam properties and morphology in medical applications.
Article
Polymer Science
Mohammad M. Afroz, Yun Kyung Shin, Adri C. T. van Duin, Katie D. Li-Oakey
Summary: In this study, we used the ReaxFF simulation method to investigate the physiochemical and mechanical properties, as well as the stimuli response behavior, of a shape-memory polyurethane (SMPU) rigid segment. We developed models for both crystalline and amorphous forms of a common rigid segment of SMPUs and performed molecular dynamics simulations to predict their structural and physiochemical properties. This study provides a theoretical pathway for the application-oriented design of high-performance SMPUs in fields such as soft robotics.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Qianyun Zhong, Xingxing Chen, Yuxuan Yang, Chenhui Cui, Li Ma, Zhen Li, Qiang Zhang, Xiaoming Chen, Yilong Cheng, Yanfeng Zhang
Summary: Transparent and degradable polyurethane elastomers with high strength and toughness are in demand for various applications. This study introduced a facile and efficient strategy by employing imidazolidinyl urea (IU) as a multiple hydrogen-bonding motif to fabricate elastomers with superior breaking strength and toughness. The elastomers showed potential application in post-operative anti-adhesion, with breaking strength reaching up to 49.9 MPa after pre-stretching to 600% strain.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Polymer Science
Zhishuai Geng, Aimin Pang, Tengfei Ding, Xiaoyan Guo, Rongjie Yang, Yunjun Luo, Jinxian Zhai
Summary: In this study, a new mechanism of modulating the mechanical properties of polyurethane elastomers was uncovered. The extra hydrogen bonding motifs in the cross-linkers were found to determine the stiffness and toughness of the elastomers.
Article
Polymer Science
Yang Liu, Zetian Zhang, Junchao Wang, Taoling Xie, Liying Sun, Kaifeng Yang, Zhengjun Li
Summary: A novel bio-based polyurethane material with excellent mechanical properties and high self-healing efficiency was developed in this study, demonstrating good reprocessing capabilities. By adjusting the content of dynamic phenol-carbamate bonds, a balance was achieved between mechanical properties and self-healing efficiency.
Article
Chemistry, Multidisciplinary
Josefine Meurer, Julian Hniopek, Thomas Baetz, Stefan Zechel, Marcel Enke, Juergen Vitz, Michael Schmitt, Juergen Popp, Martin D. Hager, Ulrich S. Schubert
Summary: A new shape-memory polymer is presented, utilizing two different metal complexes to achieve high strain fixity rates and strain recovery rates, with the mechanism revealed through various techniques such as Raman spectroscopy.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Applied
Yujie Wang, Lili Wang, Hao Liu, Suqin He, Xuying Liu, Wentao Liu, Miaoming Huang, Chengshen Zhu
Summary: The development of smart polyurethane (PU) coatings to enhance the biocompatibility of metal scaffolds has attracted significant interest in recent years. The study revealed that IPDI-based PU exhibits thermal-responsive deformation while HDI-based PU possesses excellent shape memory property. This research offers a useful approach for effectively designing the structures and properties of PU coatings.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Polymer Science
Ewa Kijenska-Gawronska, Adrian Maliszewski, Monika Bil
Summary: Fibrous shape memory scaffolds made of thermoplastic polyurethane were fabricated, and the effect of fiber diameter and alignment on crystallinity, mechanical properties, and shape memory was analyzed. The results showed that changes in fiber diameter did not significantly affect shape recovery coefficient, while longitudinal fiber alignment enhanced mechanical properties and shape recovery.
Article
Engineering, Biomedical
Ailifeire Fulati, Koichiro Uto, Masanobu Iwanaga, Miho Watanabe, Mitsuhiro Ebara
Summary: This article reports a novel shape-memory polymeric string that is ultra-stretchable, strong, tough, and highly recoverable. The contraction force of this string can be customized by adjusting the energy storage capacity, and it displays a controllable shape-memory response time. It has potential applications in blood vessel contraction in minimally invasive surgeries.
ADVANCED HEALTHCARE MATERIALS
(2022)
Review
Instruments & Instrumentation
Prashant Pingale, Shilpa Dawre, Vividha Dhapte-Pawar, Namdev Dhas, Amarjitsing Rajput
Summary: The advancement of 4D printing is driven by the demand for additive manufacturing and shape-memory materials. It allows the printing of substances that respond to external stimuli and simulate physiological environments. This review focuses on the basics and methods of 4D printing, as well as the time-dependent behavior of stimulus-sensitive compounds. It also discusses material aspects and potential applications in the biomedical sector.
DRUG DELIVERY AND TRANSLATIONAL RESEARCH
(2023)
Article
Polymer Science
Fernanda Cabrera Flores Valim, Gustavo Peixoto Oliveira, Gibran da Cunha Vasconcelos, Lucilene Betega de Paiva, Chiara Santillo, Marino Lavorgna, Ricardo Jorge Espanhol Andrade
Summary: In this study, polyester-based thermoplastic polyurethane samples were annealed at 110 degrees C for different durations. The results indicated an enhancement of shape memory effect in the annealed samples, which was attributed to the modifications of hard-soft domain morphology during thermal annealing, forming new short-range ordered hard domains. This led to an increase in stiffness and shape recovery ratio in the TPU samples.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Agricultural Engineering
Xiangzhao Wang, Xiaobin Huang, Zemin Ji, Wenbin Hu, Haoqiang Sheng, Xiaofei Li
Summary: This study reports a nanoparticle-free, recyclable, and photothermal-responsive polyurethane material for shape memory applications. The material exhibits excellent mechanical properties, malleability, and recyclability. Through photothermal effects, the material can undergo thermal remodeling and shape memory reconstruction. Additionally, the material possesses outstanding photothermal performance, enabling applications such as photothermal shape memory and photothermal antibacterial properties.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Review
Polymer Science
Yousif Saad Alshebly, Marwan Nafea, Mohamed Sultan Mohamed Ali, Haider A. F. Almurib
Summary: Four-dimensional (4D) printing allows structures to respond to external stimuli and change characteristics, leading to revolutionary advancements in robotics, biomedicine, and industry. The development in this field provides researchers with foundations for designing materials and printing methods that suit their application needs. The focus of research lies in shape memory effects and shape programming of 4D printed designs.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Ping Liu, MinQiang Meng, Yang Xiao, HanLong Liu, Gui Yang
Summary: Polyurethane foam adhesive (PFA) has been introduced as an alternative stabilizer in geotechnical applications, but its dynamic properties in reinforced soils are not well understood. Experimental results showed that PFA content, confining pressure, and consolidation stress ratio significantly affect the shear modulus and damping ratio of soils, while the loading frequency has negligible effect. A modified hyperbolic empirical model can predict the relationship between shear modulus and shear strain, with proposed upper and lower bounds for damping ratio.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Review
Construction & Building Technology
Iman Abavisani, Omid Rezaifar, Ali Kheyroddin
Summary: Shape memory materials (SMMs) are widely used in civil engineering due to their unique ability to memorize their original shape and return to it under stimuli. These materials, including shape memory alloys, magnetic shape memory alloys, shape memory polymers, and shape memory ceramics, have multifunctional properties and can be applied in various systems.
JOURNAL OF BUILDING ENGINEERING
(2021)
