Polymer Chemistry
·
2022
·Vol. 13
·期 24
·3696-3704
·
IF 5.364
Cheng-Lin Yang,Feng Zhong,Cai-Yuan Pan,Wen-Jian Zhang,Chun-Yan Hong
Polymerization-induced self-assembly (PISA) has been demonstrated to be a powerful strategy to produce polymeric nano-objects of various morphologies. Dependent on the solubility of monomers, PISA is usually classified into two formulations as dispersion polymerization or emulsion polymerization, which may undergo quite different processes of polymerization and morphology transition. Generally, chain propagation of the solvophobic blocks will induce the morphology transition of the nano-objects from spherical micelles to higher order morphologies. However, the limitation of morphology evolution is often observed during PISA, and how to overcome the trapped spherical micelles obviously depends on case-by-case analysis. Herein, RAFT-mediated PISA of benzyl methacrylate (BzMA) in different formulations is investigated by varying the solvent composition (the mass ratio of ethanol/water). The polymerization kinetics, nucleation, and morphology transitions are quite different between these different PISA formulations. The morphology transition of spherical micelles, to worm-like micelles, and finally to vesicles is only observed at a moderate ratio of ethanol/water (5/5, w/w). At either a higher ratio of ethanol/water (7/3, w/w) or lower ratio of ethanol/water (3/7, w/w), morphology transitions of spherical micelles to the higher order ones are both limited, but the limited morphology transitions are caused by a different mechanism. The entrapped spherical micelles at ethanol/water = 7/3 (w/w) are determined by thermodynamic factors, and morphology transition can be achieved by using a shorter solvophilic polymer as the macro-RAFT agent, while the spherical micelles obtained at ethanol/water = 3/7 (w/w) are kinetically trapped, which can be overcome by copolymerization of some other monomers to improve the flexibility of solvophobic blocks. This work is promising as it provides a principle to overcome the limitations of morphology evolution in different cases and develops the design for formulations of PISA.
研究领域:
高分子化学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2021
·
IF 3.189
Cheng Fang,Fuxiang Zhou,Xiaolong Zhu
The cyclic methacrylate monomer benzyl methacrylate (BzMA) was evaluated as an alternative to traditional methyl methacrylate (MMA) as a hard monomer in the application of an acrylate latex pressure sensitive adhesive (PSA). The influences of BzMA on the resultant latex and PSA properties were comprehensively investigated. Both FTIR and 1 H NMR analysis indicated that BzMA could be successfully introduced into the latex PSA copolymer through emulsion polymerization . TEM images illustrated that the synthesized latex particles are spherical and uniform. DSC and TGA results showed that the T g of the copolymer was elevated, while thermal stability was first increased and then decreased with the introduction of BzMA. Besides, it was also found that the water resistance of the latex PSA was improved by the presence of BzMA, which was confirmed by water contact angle measurements . Furthermore, as the BzMA content increased, the gel content slightly decreased, while sol molecular weight (M w , M n ) of the polymer increased. Finally, with respect to the adhesive properties of the PSA, it was observed that loop tack decreased, while shear strength increased with the incorporation of BzMA. 180° peel strength initially increased and then decreased with the addition of BzMA from 0 to 30 wt%, with a maximum value at 5 wt%.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Protection of Metals and Physical Chemistry of Surfaces
·
2019
·Vol. 55
·期 3
·495-501
·
IF 0.787
Lijun Chen,Shao Tantan,Gong Yilu,Wang Xiuming
The novel poly (VAC-VeoVa-HFMA-BZMA) latex was successfully prepared via semicontinuous seeded emulsion polymerization which vinyl acetate (VAc) and vinyl ester of neodecanoic acid (VeoVa10) were main monomer, hexafluorobutyl methacrylate (HFMA) and benzyl methacrylate (BZMA) were used as functional monomer. Dodecyl benzene sulfonic acid sodium (SDBS), octylphenol polyoxyethylene ether (OP-10) and potassium persulfate (KPS) were used to be mixed emulsifier and initiator, respectively. The structure of the resultant latex is determined by Fourier transform infrared spectroscopy spectrum (FTIR). The thermal performances of latex film are studied via the thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The average particle size of the latex is characterized by the dynamic light scattering(DLS).Water contact angle (WCA) is used to test the wetting property of the novel poly (VAC-VeoVa-HFMA-BZMA) latex film. The condition of synthesizing the latex was studied in detail. The optimum condition of preparing the novel latex is that the amount of emulsifier is 8.0% (wt %) and the mass ratio of SDBS to OP-10 is 2 : 1 and the mass ratio of main monomer VAc to VeoVa10 is 3 : 1. The amount of initiator is 0.8% and the amounts of HFMA and BZMA are 6.0 and 8.0% (wt %), respectively. Results indicate that the water resistance of the latex film and thermal stability are improved when the fluorine and BZMA monomers are added.
研究领域:
高分子化学
·
材料科学
·
应用化学
·
功能材料
·
纳米材料
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yanjia Zhou,Guihong Lan,Yongqiang Liu,Songsong Xue,Bo Xu,Haiyan Qiu,Keyu Pu
To obtain a demulsification material with convenient recovery, high oil-water separation capacity, and excellent reusability, Fe 3 O 4 @SiO 2 core-shell particles and hydrophilic DMC were introduced into the acrylic ester-based polymer system to prepare a magnetic amphiphilic composite demulsifier, Fe 3 O 4 @SiO 2 /poly(SMA-co-BA-co-BZMA-co-DMC) (Fe 3 O 4 @SiO 2 /PAMCs-P). The molecular structure of Fe 3 O 4 @SiO 2 /PAMCs-P was characterized using FT-IR and XPS, while the morphology was observed using SEM. Additionally, the effects of TEOS, Fe 3 O 4 @SiO 2 core-shell particles, and DMC dosage on the demulsification performance of the composites were discussed in detail. Fe 3 O 4 @SiO 2 /PAMCs-P exhibited excellent demulsification, oil-water separation, and reusability properties for CTAB-toluene emulsions. Under magnetic field conditions, Fe 3 O 4 @SiO 2 /PAMCs-P achieved saturated separation within 2 h with a separation efficiency of 97.9%. After five consecutive separations, the separation efficiency decreased to 39.1%, but it could be restored to 91.5% of the initial separation efficiency after desorption. These results indicate that Fe 3 O 4 @SiO 2 /PAMCs-P has valuable application potential in emulsified wastewater treatment.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 9
·1161-1168
·
IF 3.603
Gao Dan-Ni,Zhao Yu-Lai,Cai Jing-Yu,Hou Lin-Xi,Xiao Long-Qiang
Reversible chain transfer catalyzed polymerization (RTCP) is a practical and efficient process for the precise synthesis of polymers with special architecture by using simple phenols (2,4,6-trimethylphenol, TMP) or hydrocarbons (xanthene, XT) as efficient organocatalysts. Herein, alkyl iodide (R-I), which was generated from in situ bromine-iodine transformation of alkyl bromide (R-Br) with sodium iodide (NaI), was served as initiator to mediate RTCP with TMP or XT. MMA and other functional methacrylates, including GMA, DEAM, DMAEMA and BzMA, were successfully initiated by combining organocatalysts and azo initiators to yield polymers with low-polydispersity ( M w / M n =1.1–1.5) and ideal monomer conversions (50%–90%) at moderate temperature. Moreover, 3-armstar polymers were also obtained by this method. The high chain-end fidelity of the obtained poly(methyl methacrylate) with iodine as chain-end group (PMMA-I) was confirmed by chain-extension reaction. The environmentally friendly initiators and organocatalysts exhibit powerful polymerization properties toward RTCP, providing a significant method to synthesize functional polymers.
研究领域:
高分子化学
·
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·
IF 3.9
Liu Xuemei,Wang Peng,Wan Mengting,Li Songjun,Zhang Yuan
In this study, the photoresponsive monomer of 2-nitrobenzyl methacrylate (NBMA) was introduced into the dispersion polymerization of benzyl methacrylate (BzMA) monomer mediated by poly[ N , N -(dimethylamino) ethyl methacrylate] (PDMAEMA) macro-RAFT agent, and the PDMAEMA- b -P(BzMA- co -NBMA) block copolymer nanoparticles were prepared. The effects of the introduction of NBMA on the polymerization kinetics and the morphology of formed copolymer nanoassemblies were studied in detail. Then, the light response of PDMAEMA- b -P(BzMA- co -NBMA) block copolymer nanoparticles was verified. Moreover, the copolymer nanoparticles after irradiation could be used as the templates for loading silver nanoparticles, and it is proved that the template has advantage of regulating the amount of loaded silver by changing the UV light irradiation time. Graphical Abstract
研究领域:
高分子科学
·
材料科学
·
纳米技术
·
光化学
✓ 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）