Surfaces and Interfaces
·
2024
·
IF 5.7
Manli Zhou,Taishun Zhang,Bao Zhang,Xiaohong Peng
Anti-glare coatings offer a promising solution for mitigating light pollution, with the construction of a rough surface being essential to their effectiveness. In this paper, a series of waterborne polyurethane (WPU) coatings with self-antiglare effect were successfully synthesized by adjusting the molar ratio of the post-chain extenders sodium N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate (BES) and hydrazine hydrate (N 2 H 4 ). This approach utilized BES as a post-chain extender for the first time, resulting in a double micro-rough surface structure that enabled the coating to achieve better anti-glare effect with relatively lower roughness. The effects of BES and N 2 H 4 on particle size, morphology, gloss, zeta potential, transmittance, and hydrophilicity of WPU were investigated. When the BES content accounted for 30 mol% of the post-chain extenders, the average particle size of the emulsion was 1321.4 nm, and the 60° gloss of the coating was 36.1 GU. Additionally, we thoroughly analyzed the formation mechanism of the “worm-like” micro-rough structure on the surface of latex particles. The strongly hydrophilic -SO 3 − Na + groups in the emulsion pulled the molecular chains to extend to the outer layer of the latex particles. Upon water evaporation, these molecular chains curled up on the particle surfaces, forming a "worm-like" micro-rough structure. XRD spectrum, FBI-SEM, and TEM images confirmed that this micro-rough structure was formed by self-assembly on the particle surface rather than internal crystallization. This finding provides novel insights into the development of self-antiglare WPU coatings characterized by intricate rough surfaces. Furthermore, it contributes to the advancement of surface and interface science through improved performance of WPU coatings.
研究领域:
材料科学
·
界面化学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·Vol. 45
·期 19
·2400259
·
IF 4.2
Zhihao Niu,Yimin Wang,Xin Wang,Dexian Yin,Tao Shou,Pengfei Cao,Xiuying Zhao,Shikai Hu,Liqun Zhang
The thermodynamic incompatibility between the soft and hard segments of thermoplastic polyurethane (TPU) results in a microphase-separated behavior and excellent mechanical properties. However, the effect of the chain extender on the degree of microphase separation (DMS) and the resultant mechanical properties of TPU have not been well studied because of the complex interactions between the soft and hard segments. Herein, hydroxyl-terminated polybutadiene-based TPUs(HTPB-TPUs) without hydrogen bonding between the soft and hard segments are synthesized using hydroxyl-terminated polybutadiene, toluene diisocyanate, and four different chain extenders, and the effect of the chain extender structure on DMS is analyzed experimentally using a combination of analytical techniques. Furthermore, the solubility parameters of the soft and hard segments, glass transition temperatures, and hydrogen-bond density of the HTPB-TPUs, are computed using all-atom molecular dynamics simulations. The results clearly reveal that the chain extender significantly affects the DMS and thus the mechanical properties of HTPB-TPUs. This study paves the way for studying the relationship between the structure and properties of TPU.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 40
·31878-31885
·
IF 3.84
Alvianto Wirasaputra,Jianqing Zhao,Yaming Zhu,Shumei Liu,Yanchao Yuan
Chain scission of polyamide-6 (PA6) takes place readily during high temperature processing. To prevent possible deterioration in its properties, chain extension of PA6 by the use of bis(glycidyloxy)phenylphosphine oxide (BGPPO), a traditional small molecule flame retardant, has been evaluated in the present study. It was found that the melting torque of PA6 modified by 2.5 minutes' mixing with 1.5 wt% BGPPO was about seven times higher than that of unmodified PA6. As a result of the modification, the proportion of amino and carboxyl end-groups of PA6 was greatly decreased. Accordingly, the tensile, flexural and notched Izod impact strength of the chain-extended PA6 were correspondingly increased, the improvement being superior to that produced using a commercial chain extender. The use of BGPPO for this purpose exemplifies its multifunctional characteristics.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 29
·45093
·
IF 1.86
Jianning Wu,Baoxun Sui,Lei Li,Guihua Meng,Xuhong Guo,Zhiyong Liu
A higher porosity with better thermostability is desirable for poly(vinyl chloride) (PVC) resin. In this study, high molecular weight PVC resins are prepared by vinyl chloride monomer (VCM)-diallyl phthalate (DAP) suspension copolymerization in a 20-L reactor at 50 °C using DAP as chain extender. SEM, BET, and analyses of plasticizer absorption results show the high molecular weight poly(vinyl chloride) (HPVC) by DAP-VCM copolymerization is loose and porous. With increasing DAP content when the mass ratio of DAP/VCM (ω ) is below the gel point, the porosity and the degree of polymerization increase. Nevertheless, the bulk density and particle size decrease. When more than the gel point, these relationships are reversed. Thermogravimetric analysis revealed that the HPVC had better thermostability than that of commercial PVC, and its thermostability increases with increasing ω before it reaches the gel point. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45093.
研究领域:
高分子化学
·
材料科学
·
聚合物合成
·
热分析
·
多孔材料
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Wanqing Lei,Changqing Fang,Xing Zhou,Youliang Cheng,Rong Yang,Donghong Liu
Since polyurethane elastomer (PUE) is widely used in many fields, it is always the popular topic in the scientific research. In this paper 1,4 -butanediol ( 1,4- BDO), neopentyl glycol (NPG) and bisphenol -a (BPA) were chosen as chain extenders to prepare polyurethane elastomer (PUE) due to their representative structures. After the synthesis of PUE with these comparable chain extenders, morphology and thermal properties were evaluated by different characterization methods The results showed that, compared with NPG and BPA, 1,4- BDO has made PUE in synthesis of para -phenylene (PPDI) more easily crystallize in soft segments while PUE based on diphenylmethane diisocyanate (MDI) arrange orderly in hard segments, so that micro-phase separation appeared. Besides, PUE in synthesis of PPDI and 1,4- BDO showed the best thermal stability. Additionally, chain extenders increased the viscosity of samples, especially 1,4- BDO, which made PUE not only have a relatively higher viscosity, but also maintain a good process ability.
研究领域:
材料科学
·
高分子化学
·
热分析
✓ 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）