Article
Polymer Science
Congling Shi, Mei Wan, Zhengbo Hou, Xiaodong Qian, Honglei Che, Yueping Qin, Jingyun Jing, Jian Li, Fei Ren, Bin Yu, Ningning Hong
Summary: In this study, Co-MOF@MXene hybrids flame retardants were synthesized and incorporated into TPU, improving the flame retardant performance and char residue of TPU composites.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Polymer Science
Ying-Chi Huang, Yu-Hsiang Huang, Li-Yun Chen, Chi-An Dai, Shenghong A. Dai, Ying-Hsiao Chen, Chien-Hsin Wu, Ru-Jong Jeng
Summary: This study demonstrated the development of recycling feasibility, monomers reactivity, and the chemical-recycled polymer properties from polycarbonate (PC) waste, resulting in the production of thermoplastic polyurethanes (TPUs) with improved elastomeric properties. The TPUs exhibited a unique phase separation morphology with domain sizes ranging from similar to 10 nm to similar to 25 nm, showing potential for applications in various fields.
Review
Chemistry, Applied
Taher Azdast, Rezgar Hasanzadeh
Summary: Polymeric foams have attracted attention for their unique properties such as high strength to weight ratio, excellent thermal and sound insulation, and low cost. Researchers have shown that increasing cell density/decreasing cell size can achieve superior thermal insulation. The most efficient solutions include using nucleating agents, increasing blowing agent solubility, and using nanoparticles to achieve microcellular and nanocellular structures.
JOURNAL OF CELLULAR PLASTICS
(2021)
Article
Materials Science, Multidisciplinary
Daniel Cuadra-Rodriguez, Suset Barroso-Solares, Ester Laguna-Gutierrez, Miguel Angel Rodriguez-Perez, Javier Pinto
Summary: The study presents a method for producing open-cell nanostructures in polymer foams without solid skins by gas dissolution foaming. MAM block copolymer is used as a heterogeneous phase to produce the open-cell structures, and AFM and extensional rheology are utilized to understand the main features. The gas diffusion barrier approach is employed to prevent the appearance of solid skins, and the influence of poly(vinyl alcohol) barrier and MAM copolymer on the solid skins' formation is analyzed.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Audrey Magnin, Lisa Entzmann, Alfred Bazin, Eric Pollet, Luc Averous
Summary: Polyurethane waste recycling is challenging, but a green recycling pathway was proposed in this study through enzyme depolymerization and organometallic-catalyzed synthesis of second-generation polymers.
Article
Polymer Science
Guoxin Ding, Hongxu Tai, Chuanxin Chen, Chenfeng Sun, Zhongfeng Tang, Guojun Cheng, Xianglong Wan, Zhoufeng Wang
Summary: A two-step grafting procedure was used to graft TEPA and SiO2 onto GO surface to obtain TGOS for reinforcing TPU, resulting in significant improvements in mechanical properties and heat resistance. Rheological tests showed that the addition of TGOS improved the deformation resistance of TPU.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Jose I. I. Sintas, Josh D. D. Wolfgang, Timothy E. E. Long
Summary: Polyurethane foams are widely used in cushioning, insulation, packaging, and structural applications. However, the risk of exposure to isocyanate-containing precursors during foaming operations has prompted investigations into non-isocyanate alternatives. This study presents the synthesis of non-isocyanate polyurethanes (NIPUs) using carbonyldiimidazole (CDI) derived monomers, which adhere to the principles of green chemistry. The NIPU foams exhibit a range of properties, including flexible and rigid compositions, controlled pore structure, and predictable performance.
Article
Engineering, Multidisciplinary
Aizezi Maimaitiming, Xiuli Sun, Ying Lu, Guozhong Wu, Yongfeng Men, Xia Dong, Yong Tang
Summary: In this study, hierarchical 2D-oriented micro-foams and photonic elastomers were successfully produced by assembling the superstructures of olefin multiblock copolymers (OBCs). These materials demonstrate lightweight properties and excellent thermal conductivity, and have potential applications in sound and thermal insulation, auto-parts, shape memory light actuators, and soft sensors.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Samy A. Madbouly
Summary: Polyurethane foams (PUFs) are widely used in various industrial applications due to their excellent properties. However, the large amount of PUFs waste poses a serious environmental concern. Physical recycling and chemical recycling are common methods for recycling PUFs. Chemical recycling involves converting PUFs into their original chemical components with the help of catalysts.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2023)
Article
Polymer Science
Anand Utpal Vakil, Natalie Marie Petryk, Ellen Shepherd, Mary Beth B. Monroe
Summary: Polyurethane foams are widely used as a biomaterial system due to their ability to tune physical, chemical, and biological properties. By adding ether-containing monomers, shape memory polymer foams with tunable degradation rates have been synthesized for longer-term stability in various biomaterial applications. These SMP foams have the potential to provide controlled erosion profiles and up to 15% mass remaining after 108 days when used in oxidative and hydrolytic media for in vitro degradation assessment.
Article
Polymer Science
Ying Wu, Shuo Zhang, Shuqing Han, Kesong Yu, Linyan Wang
Summary: In this study, a crystal nucleating agent was introduced into poly (lactic acid) (PLA) system to improve its foamability and mechanical properties. The results showed that the crystal nucleating agent greatly promoted PLA crystallization, and by controlling the crystallization process, PLA foams with controllable cell structures and high compression properties were obtained.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Chemistry, Physical
Yaniv Cohen, Siva K. Reddy, Assaf Ya'akobovitz
Summary: The study shows that graphene foam devices have a much higher convective coefficient compared to metals, and exhibit reproducible thermal behavior. This suggests that graphene foam may be a promising material for efficient heat dissipation applications, particularly in areas such as circuits.
Article
Polymer Science
Xiaoshuai Zhu, Xijue Li, Hao-Yang Mi, Xin Jing, Binbin Dong, Ping He, Chuntai Liu, Changyu Shen
Summary: Thermoplastic polyurethane (TPU) foams are commonly used buffering materials due to their lightweight, high elasticity, and excellent energy absorption properties. In this study, graphene oxide (GO)/TPU composite foams with micro-sized wrinkles on the cell surface were fabricated using a novel dynamic supercritical carbon dioxide (scCO(2)) foaming method. The addition of GO improved the cell density and mechanical properties of the foams, resulting in enhanced compressive modulus, strength, energy absorption, and recoverability. The wrinkled GO/TPU foams with 0.5 wt% GO showed superior performance compared to neat TPU and 1 wt% GO foams, thanks to the reinforcing effect of the wrinkly structure. This study is significant for the development of low-density composite foams with enhanced compressive performance.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Nyla Amjed, Ijaz Ahmad Bhatti, Leonardo Simon, Charles Dal Castel, Khalid Mahmood Zia, Muhammad Zuber, Iram Hafiz, Main Anjum Murtaza
Summary: The aim of this research is to expand the application range of biomaterials in the medical field by improving the antibacterial and biocompatible properties of thermoplastic polyurethanes. Blends of thermoplastic polyurethanes with chitosan and starch were prepared and their thermal and morphological aspects were investigated. The results showed that the thermoplastic polyurethanes blended with chitosan and starch possessed antibacterial and hemolytic potential.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Biochemistry & Molecular Biology
Karolina Miedzinska, Sylwia Czlonka, Anna Strakowska, Krzysztof Strzelec
Summary: The study showed that silanization improved filler surface smoothness and modified PUR foams for enhanced properties. Different fillers affected material morphology. Unmodified plum filler improved mechanical properties, while silanized filler enhanced thermal stability.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Engineering, Chemical
Shu-Kai Yeh, Yu-Che Liu, Chien-Chia Chu, Kung-Chin Chang, Sea-Fue Wang
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2017)
Article
Materials Science, Composites
Shu-Kai Yeh, Hong-Yi Zhuang, Yao-Chun Chen, Po-Chun Tseng, Jie-Yu Zheng, Ling-Yueh Yang, Kuei-Chi Lee, Yu-Liang Chen
POLYMER COMPOSITES
(2019)
Article
Engineering, Chemical
Shu-Kai Yeh, Wei-Hsiang Liu, Yen-Ming Huang
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2019)
Article
Polymer Science
Shu-Kai Yeh, Jhih-Jhang Lin, Hong-Yi Zhuang, Yao-Chun Chen, Hsiao-Ching Chang, Jie-Yu Zheng, Ling-Yueh Yang, Kuei-Chi Lee, Yu-Liang Chen, Syang-Peng Rwei
JOURNAL OF POLYMER RESEARCH
(2019)
Article
Engineering, Chemical
Shu-Kai Yeh, Chi-Chun Su, Jian-Ming Huang, Ming-Qing Ke, Dawit Bogale, Ramasamy Anbarasan, Kuo-Lun Tung, Sea-Fue Wang
POLYMER ENGINEERING AND SCIENCE
(2020)
Article
Engineering, Chemical
Shu-Kai Yeh, Yi-Bei Tsai, Kiday Fiseha Gebremedhin, Tse-Yu Chien, Rong-Yu Chang, Kuo-Lun Tung
Summary: The study found that adding high-melt-strength polypropylene can increase the foam expansion ratio, open-cell content, and widen the foam processing window, resulting in improved oil absorption. Additionally, low oil viscosity can lead to higher oil absorption.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Construction & Building Technology
Shu-Kai Yeh, Chun-Ruei Hu, Maria Bangun Rizkiana, Chang-Hsin Kuo
Summary: The research investigated the impact of different lignocellulosic fiber sizes and additives on the durability of wood plastic composites after water absorption/desorption. The results show that finer wood particulates absorbed less moisture and adding MA helped maintain modulus while reducing moisture absorption during cyclic tests.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Shu-Kai Yeh, Raghavendrakumar Rangappa, Ting-Hao Hsu, Stephen Utomo
Summary: This study investigated the effects of the extrusion process on the cell morphology and foam shrinkage of thermoplastic polyurethane. The results showed an increase in cell density and elongation at break after extrusion, with significant impacts of T-sat and P-sat on foam properties.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Polymer Science
Nigus Maregu Demewoz, Shu-Kai Yeh
Summary: This study investigates the impact of thermoplastic polyurethane (TPU) on the structure and density of nanocellular foam production. Blending 2% TPU with PMMA creates a well-dispersed system and achieves a minimum particle size of less than 100 nm. The resulting nanocellular foam has low density and an open-cell structure.
Article
Engineering, Chemical
Kiday Fiseha Gebremedhin, Po-Chih Tseng, Nigus Maregu Demewoz, Shu-Kai Yeh
Summary: Nanocellular foam has attracted much interest due to its superior physical and mechanical properties compared to microcellular foams. The hot-press foaming process shows potential in producing large and flat nanocellular foam samples, with larger cell size, higher expansion ratio, and higher aspect ratio compared to the hot-bath foaming method.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Materials Science, Biomaterials
Raghavendrakumar Rangappa, Shu-Kai Yeh
Summary: Using nitrogen as a blowing agent, this study successfully fabricated elastomeric foams with a homogenous cell structure. The nitrogen-blown foams exhibited a lower shrinkage ratio and better cellular morphology compared to CO2-blown foams, effectively eliminating the shrinkage problems of elastomeric foams.