DYES AND PIGMENTS
·
2017
·
IF 3.473
Feihu Li,Bingtao Tang,Shufen Zhang
Artificial structural color materials from self-assembled colloidal spheres, which are similar to natural opals, are currently a subject of extensive investigation. However, the shortage of available colloidal spheres, especially polymer spheres for building artificial opals is still a major restriction for their practical application. Herein, a new kind of artificial opals with iridescent structural colors were prepared from the self-assembly of novel polythiourethane microspheres (PTUMS). The PTUMS with narrow size distribution were prepared through a simple phase separation process. Particle sizes can be easily adjusted from 175 nm to 304 nm, which is important for the construction of tunable structural colors. Sufficient surface charges were obtained from the reaction between the terminal isocyanate groups and water. Thus, PTUMS can arranged into periodic opal structures through self-assembly process and generate iridescent structural colors. The present study provided an effective and convenient approach to prepare artificial structural color materials from new kind of polymer microspheres. This was very important for the practical application of artificial opals in coating and paints.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2017
·Vol. 26
·期 11
·821-831
·
IF 1.422
Cheng Chuanjie,Li Yupeng,Zhang Xu,Li Jin
Global resource crisis and severe environmental problems have compelled world scientists to develop sustainable and green chemical materials. In this work, eugenol, a cheap and renewable phenol derivative found in cloves, is successfully utilized to prepare hydroxyl non-isocyanate polyurethanes (HNIPU), with number-average molecular weights ( M
n ) from several to dozens of kilodaltons. First, a diepoxide intermediate is synthesized through three steps in 43.9% total yield. Second, this diepoxide reacts with CO 2 at atmospheric pressure to form an intermediate possessing two cyclic carbonate groups in moderate yield. Third, the cyclic carbonate-containing intermediate further reacts, with compounds such as 4,4′-diaminodiphenyl methane, 1,6-hexanediamine and p -xylene diamine by nucleophilic ring-opening to obtain the desired HNIPUs. Furthermore, the diepoxide intermediate and CS 2 undergo addition reaction to form cyclic dithiocarbonate intermediate that further reacts with 4,4′-diaminodiphenyl methane to afford polythiourethane (PTU). The resulting PTU contains mercapto groups in its each unit. Number-average molecular weight of PTU is Mn 2800 Da. Finally, crosslinking reactions occur between the mercapto groups of PTU and crosslinkers (1,6-hexanediol acrylate and/or cardanol) by thiol-ene reactions under UV ( λ = 365 nm) irradiation conditions, leading to their corresponding crosslinked polymers. The optimized conditions for preparing crosslinked polymers include: PTU/cardanol/1,6-hexanediol acrylate = 1:1:0.05 (mass ratio), and UV irradiation time for 30 min. This work is expected to expand applications of eugenol and to provide a new route to NIPUs and PTUs using various diamines.
研究领域:
材料科学
·
绿色化学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Xiaobo Xu,Minghui Cui,Mengqiu Quan,Yuqing Wang,Genzheng Sha,Jin Zhu,Ning Yan,Jing Chen
The use of renewable raw materials to construct environmentally friendly, nontoxic, nonisocyanate polymer materials has been gaining attention. Here, we prepared ferulic acid epoxy (FAE) by directly reacting the lignin derivative ferulic acid with epichlorohydrin. It was used as a precursor to construct five-membered cyclic carbonate (CC) and five-membered cyclic dithiocarbonate (DTC) with CO2 and CS2, respectively. These cyclic carbonates are then cured with different amines to produce nonisocyanate polyurethanes (NIPUs) and nonisocyanate polythiourethanes (NIPTUs) with excellent properties. Ferulic acid contains a rigid aromatic ring structure, so the prepared nonisocyanate polymer materials have excellent mechanical properties, and the maximum tensile strength can reach 34.2 MPa. We compared NIPUs and NIPTUs in terms of their chemical structure, cross-link density, mechanical properties, and processing for remodeling. In addition, Due to the autoxidation of pendant sulfhydryl groups, disulfide bonds are present in the network structure of NIPTUs in addition to thionourethane. This endows NIPTUs with higher cross-link density, lower relaxation activation energy (Ea), and lower remodeling temperature (<140 °C). After thermocompression remodeling, the tensile strength of NIPTUs significantly increased due to the enhanced thermally induced formation of disulfide bonds. This study evaluates the potential for the direct synthesis of biobased aromatic NIPUs and NIPTUs based on ferulic acid, providing a simple route for the preparation of nonisocyanate polyurethanes and polythiourethanes using cyclic carbonates.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2025
·Vol. 15
·期 5
·588
·
IF 2.8
Songbo Xie,Xiufen Liao,Yanye Fan,Jiacheng Li,Qiumei Jiang,Yihua Zheng,Zhimin Huang,Shella Li
Traditional marine antifouling coatings function through releasing toxic antifouling agents, causing serious harm to marine ecosystems. To address this challenge, an eco-friendly fluoro-silicon-modified polythiourethane (FSi-PTU) coating has been prepared via a polymerization reaction with dihydroxy propyl silicone oil (HO-PDMS-OH), 1H,1H,2H,2H-perfluorohexanol (FTOH), hexamethylene diisocyanate (HDI), and pentaerythritol tetrakis (3-mercaptopropionate) (PETMP). The FSi-PTU polymer incorporates siloxane segments and fluorinated side chains, which are inhomogeneously distributed on the coating surface and construct a hydrophobic surface. The FSi-PTU coating exhibits good hydrophobicity, strong adhesion (≥2.14 MPa), and improved mechanical properties. The antifouling properties of the FSi-PTU coating have been researched. The results of laboratory tests demonstrate that the FSi-PTU coating exhibits excellent anti-protein adsorption and anti-algal attachment performance. The FSi-PTU-2 coating shows certain antifouling properties in the actual seawater test for three months. The results provide a certain reference value for developing eco-friendly marine antifouling coatings.
研究领域:
材料科学
·
海洋生物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）