JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 1
·e54758
·
IF 3
Xiaojuan Ma,Huimin Yue,Miaoming Huang,Gaoshang Huang,Chenxin Yao,Yaohui Wu,Suqin He,Hao Liu,Wentao Liu,Chengshen Zhu
The traditional thermoset polyurethanes (PUs) can be recycled through the dynamic carbamate bonds under specific conditions. However, there is limited research on the structural evolution and property changes of these PUs before and after recycling. Herein, we designed and fabricated a thermoset polyurethane network (PCU) using polyhexamethylene carbonate diol (PHMC-diol) as soft segments, and isophorone diisocyanate (IPDI) and glycerol (GLY) as hard segments. Through careful formulation design, the PCU demonstrated colorless transparency (with up to 86% transmission), shape memory properties, and reprocessing capabilities, all achieved without introducing other dynamic covalent bonds. Furthermore, the PCU exhibited excellent mechanical properties, boasting a tensile strength of 59.2 ± 3.7 MPa and the elongation at break of 674.8 ± 37.3%. Of particular interest, the PCU samples displayed solid-state plasticity and impressive shape memory performance, with shape fixity and recovery ratios exceeding 90%. Leveraging the combination of solid-state plasticity and shape memory, the PCU samples demonstrated the ability to achieve arbitrary shape manipulations. Upon recycling, it was observed that the cross-linking density of the PCU samples decreased, resulting in the formation of byproducts and subsequently leading to a reduction in tensile strength. Nonetheless, the PCU samples prepared in this study exhibit potential as thermadapt shape memory and recyclable materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2017
·
IF 3.151
Shuhui Zhang,Lili Pan,Lieyin Xia,Yanbin Sun,Xikui Liu
In this study, we demonstrate the synthesis of dynamic polysulfide networks through the solution polycondensation of pentaerythritol tetra(3-mercaptopropionate) (PTMP) with elemental sulfur by a reverse vulcanization process. Elemental sulfur content as high as 51% can be incorporated into the dynamic polysulfide networks. An important feature of the resulted polysulfide networks is their catalytic-free malleability, which implies that they have both thermo- and photo-induced solid-state plasticities to obtain a complex permanent shape due to the exchange of dynamic S S bonds. These dynamic polysulfide networks have great potentials in fabricating complex three-dimensional shape memory devices for biological and mechanical applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 8
·1598
·
IF 4.967
Guancong Chen,Di Chen
Shape-memory polymers (SMPs) exhibit notable shape-shifting behaviors under environmental stimulations. In a specific shape-memory cycle, the material can be temporarily fixed at diverse geometries while recovering to the same permanent shape driven by the elastic network, which somewhat limits the versatility of SMPs. Via dynamic metallo-supramolecular interactions, herein, we report a multi-functional shape-memory polymer with tunable permanent shapes. The network is constructed by the metallic coordination of a four-armed polycaprolactone with a melting temperature of 54 °C. Owing to the thermo-induced stress relaxation through the bond exchange, the SMPs can be repeatedly programmed into different geometries in their solid state and show the self-welding feature. Via further welding of films crosslinked by different ions, it will present heterogeneous solid-state plasticity, and a more sophisticated shape can be created after the uniform thermal treatment. With elasticity and plasticity in the same network, the SMPs will display programmable shape-shifting behaviors. Additionally, the used material can be recast into a new film which retains the thermo-induced plasticity. Overall, we establish a novel strategy to manipulate the permanent shapes of SMPs through solid-state plasticity and develop a multi-functional shape-shifting material that has many practical applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Junjie Zhou,Huimin Yue,Miaoming Huang,Chaobo Hao,Suqin He,Hao Liu,Wentao Liu,Chengshen Zhu,Xia Dong,Dujin Wang
The fabrication of a single polymer network that exhibits a good reversible two-way shape memory effect (2W-SME), can be formed into arbitrarily complex three-dimensional (3D) shapes, and is recyclable remains a challenge. Herein, we design and fabricate poly(thiourethane) (PTU) networks with an excellent thermadapt reversible 2W-SME, arbitrary reconfigurability, and good recyclability via the synergistic effects of multiple dynamic covalent bonds (i.e., ester, urethane, and thiourethane bonds). The PTU samples with good mechanical performance simultaneously demonstrate a maximum tensile stress of 29.7 ± 1.1 MPa and a high strain of 474.8 ± 7.5%. In addition, the fraction of reversible strain of the PTU with 20 wt % hard segment reaches 22.4% during the reversible 2W-SME, where the fraction of reversible strain is enhanced by self-nucleated crystallization of the PTU. A sample with arbitrarily complex permanent 3D shapes can be realized via the solid-state plasticity, and that sample also exhibits excellent reversible 2W-SME. A smart light-responsive actuator with a double control switch is fabricated using a reversible two-way shape memory PTU/MXene film. In addition, the PTU networks are de-cross-linked by alcohol solvolysis, enabling the recovery of monomers and the realization of recyclability. Therefore, the present study involving the design and fabrication of a PTU network for potential applications in intelligent actuators and multifunctional shape-shifting devices provides a new strategy for the development of thermadapt reversible two-way shape memory polymers.
研究领域:
材料科学
·
聚合物化学
·
智能材料
·
执行器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Smart Materials and Structures
·
2020
·Vol. 29
·期 10
·105019
·
IF 3.613
Guangming Tian,Guangming Zhu,Shuogui Xu,Longkai Pan
A facile photo-cured polycaprolactone (PCL)/polydopamine (PDA) nanocomposite is prepared via thiol-ene reaction. Owing to favorable light-to-thermal transfer of doped polydopamine nanoparticles (PDAPs) in composites, active photo-thermal actuation of the composite is achieved when subjected to simulated sunlight irradiation, the effects of sunlight intensity and PDAPs concentration on the composite's surface temperature are studied systematically. Solid state plasticity is also achieved by activating the dynamic transesterification reaction within the same polymer network. More importantly, the composite also features sunlight-induced plasticity under a light intensity of 960 mW cm−2. Macroscopically, the flat permanent shape can be reconfigured to a new 3D permanent shape via simulated sunlight, and the reconfigured shape still exhibits excellent elasticity-based shape memory behaviors even after seven cycles of testing. Based on these special properties, the PCL/PDAPs composite is further used in the field of electronic devices. It is expected that the design of PCL-PDAPs composite can pave a simple pathway for the simplification of complex shapes and can be extended to fabricate light-operated actuators.
研究领域:
材料科学
·
纳米技术
·
聚合物化学
·
光电技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）