MACROMOLECULES
·
2018
·
IF 5.914
Congguang Zheng,Yan Zhou,Yanpeng Jiao,Huiqi Zhang
Controlled preparation of narrow or monodisperse, physically cross-linked, and “living” spherical polymer particles by one-stage reversible addition–fragmentation chain transfer (RAFT) precipitation polymerization (RAFTPP) is described for the first time. The introduction of RAFT polymerization mechanism into precipitation polymerization system, together with the use of methacrylic acid (MAA) (capable of forming hydrogen bonding) as the monomer, allows ready generation of uniform spherical poly(MAA) (PMAA) particles with surface-bound “living” dithioester groups, easily tunable sizes, and low molecular weights in the absence of any cross-linking monomer. The polymerization parameters (i.e., monomer loading, molar ratio of the RAFT agent to free radical initiator, and polymerization temperature) showed much influence on the morphologies and yields of PMAA particles, and their simple adjustment allows fine-tuning of “living” PMAA particle sizes. The presence of dithioester groups on such PMAA particles was confirmed not only by their light pink color and characteristic UV–vis absorbance peak of dithioester units but also by their capability of directly grafting cross-linked apolar polymer shells. Some uniform “living” PMAA-based functional copolymer microspheres were also prepared in a one-stage process by simply incorporating glycidyl methacrylate, 2-hydroxyethyl methacrylate, or a fluorescent monomer into the RAFTPP of MAA, demonstrating the high versatility and general applicability of the RAFTPP system. The polymerization of MAA in RAFTPP proved to occur both in the continuous phase and on PMAA particle surfaces instead of inside particles, and a combined “grafting from” and “grafting to” particle growth mechanism is proposed for RAFTPP.
研究领域:
高分子化学
·
材料科学
·
大分子化学
·
胶体与界面科学
·
化学合成
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2025
·
IF 20.2
Nan Zhang,Wenbo Li,Ying Liu,Shiyuan Zhang,Hong Teng,Aotian Zhang,Tianzong Ma,Minghang Zhang,Zhentong Kong,Zhengyu Zhang,Haiming Xie,Liqun Sun
Combining lithium (Li) metal anode with nickel-rich (LiNi x Co y Mn 1− x −y O 2 , NCM) cathode promises high energy density batteries. Nevertheless, lithium metal batteries (LMBs) still face critical challenges in overall safety and electrode-electrolyte interfacial stability. Herein, we design and synthesize a quasi-solid polymer electrolyte (QSPE) integrating essential isocyanate ( N = C = O ) and fluorinated (C-F) groups, with dual interfacial compatibility and multi-tiered protection strategy. The polymer chain units of smart amphiphilic QSPE (HIET) exhibits lower values for both the Lowest Unoccupied Molecular Orbital (LUMO) and Highest Occupied Molecular Orbital (HOMO) than TEGDME, resulting in an excellent Li passivation layer and high oxidation resistance. QSPE's safety performance is enhanced by the synergistic action of residual C = C bonds, crosslinked N = C = O groups, and flame-retardant CF 3 groups, providing protection across difference temperature ranges and overall safety against thermal runaway and other hazards. A Li/HIET/Li cell can be stably cycled for 2200 h with the decomposition voltage of HIET extending to 5 V. Additionally, the retention rate of NCM622/HIET/Li is as high as 95% after 200 cycles at 1C. Such hierarchical design principles provide actionable insights for advancing next generation QSPE materials toward practical LMB applications.
研究领域:
材料科学
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储能
·
电化学
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聚合物化学
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电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Shujun Zhao,Jiehao Qu,Shengjiong Yin,Xiangdong Liu,Hu Zhu
Constructing self-repairing epoxy materials based on transesterification chemistry can be regarded as a potential path for practical industrial applications given on its simplicity and ease of processing. However, there is still a challenge to improve the slow bonding exchange process for desired healing performances. Herein, this work reports a simple and effective strategy to prepare high-biomass-content self-repairing epoxy materials by introducing polyester oligomer (PEO) dicarboxylic acid as modifier into epoxidized soybean oil and itaconic acid compounds. The PEO is synthesized from glutaric anhydride and 1,4-cyclohexanediol, as well possess a unique pentamer molecular structure. It not only endows the epoxy system with improved molecular mobility in virtue of its long-chain structure, but also increases the number the essential ester groups of transesterification process, thus synergistically promoting bonding exchange rate for expected properties. As a result, the employment of PEO decreases the activation energy from 100 to 70 KJ/mol, as well as presents optimized self-repairing efficiency in storage modulus and tensile strength tests compared to the control group. It may provide a new and practical way to fabricate high-effective self-repairing epoxy system for industrial applications.
研究领域:
材料科学
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聚合物化学
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自愈材料
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环氧树脂
·
可持续材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ADHESIVE DENTISTRY
·
2024
·
IF 2.5
Zhenyu Yang,Jing Gao,Kai Tang,Longyan Duan,Shiqi Dai,An Chen,Wei Zhou,Jihua Chen
Purpose: To evaluate the effect of urethane methacrylate precursor (UMP) on the enzymatic resistance of demineralized dentin (DD) matrices. Materials and Methods: Experimental treatments containing 0 (control), 1, and 5 mmol/L UMP dissolved in an acetone (Ace) solution were formulated. Dentin matrix specimens were demineralized in vitro and immersed in the experimental treatments for 1 h. The treated specimens were then stored in 0.1 mg/mL collagenase solution for 24 h, after which their dry mass loss and hydroxyproline (HYP) release were assessed. The swelling ratios of specimens in each group were also evaluated. The interaction between UMP and the dentin matrix was observed using field-emission scanning electron microscopy (FE-SEM). Endogenous enzyme activity in dentin was evaluated using confocal laser scanning microscopy (CLSM). Results: Compared with the other treatment groups, treatment with 1 mM and 5 mM UMP-Ace significantly decreased the dry mass loss, HYP release and swelling ratio of the DD matrix (p < 0.05). FE-SEM and CLSM observations showed that treatment with UMP-Ace protected the structure of the dentin matrix and decreased porosity within the dentin-collagen network. Conclusion: Treatment with 1 mM and 5 mM UMP-Ace protects DD matrix against collagenase degradation and may be clinically useful for improving the durability of the hybrid layer.
研究领域:
口腔材料学
·
生物材料
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修复牙科
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生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 17
·2300166
·
IF 4.6
Shuai Tang,Jiao Li,Zhao Wang,Liqun Zhang
Polarity determines the oil resistance property of elastomers. In this work, three bio-based polyester elastomers (BPEs) with different mass fraction of ester groups ( E ) are designed and synthesized aiming to study the relationship of E and oil resistance performance, and to obtain bio-based elastomer materials with tunable oil resistance. Through adjusting the chain length of monomers, E of poly(ethylene glycol/1,3-propanediol/succinate/adipate/itaconate)(PEPSAI), poly(1,3-propanediol/1,4-butanediol/succinate/adipate/itaconate)(PPBSAI), and poly(1,3-propanediol/1,4-butanediol/sebacate/adipate/itaconate)(PPBSeAI) are ≈50.39%, 48.55%, and 39.68%, respectively. Results show that E has great influence on the oil resistance of BPEs. After being immersed in IRM-903 # oil for 72 h at room temperature, the changes in mass and volume of BPEs decrease along with the increasing mass fraction of ester groups, indicating improved oil resistance performance. PEPSAI with the highest mass fraction of ester groups presents better oil resistance and lower T g (better low-temperature resistance) than one of the most used commercial oil-resistant rubber nitrile rubber (N230S). Thus, this work provides a promising strategy to obtain bio-based oil resistant elastomers with practical value.
研究领域:
材料科学
·
高分子化学
·
生物技术
✓ 已验证
DOI
高影响因子
SENSORS
·
2024
·Vol. 24
·期 6
·1824
·
IF 3.4
Yuan Qu,Haotian Zheng,Yuhua Lei,Ziwen Ding,Siqi Li,Song Liu,Wei Ji
Morphology and structure play a crucial role in influencing the performance of gas sensors. Hollow structures, in particular, not only increase the specific surface area of the material but also enhance the collision frequency of gases within the shell, and have been studied in depth in the field of gas sensing. Taking SnO2as an illustrative example, a dual-shell structure SnO2(D-SnO2) was prepared. D-SnO2@Polyaniline (PANI) (DSPx, x represents D-SnO2molar content) composites were synthesized via the in situ oxidative polymerization method, and simultaneously deposited onto a polyethylene terephthalate (PET) substrate to fabricate an electrode-free, flexible sensor. The impact of the SnO2content on the sensing performance of the DSPx-based sensor for NH3detection at room temperature was discussed. The results showed that the response of a 20 mol% D-SnO2@PANI (DSP20) sensor to 100 ppm NH3at room temperature is 37.92, which is 5.1 times higher than that of a pristine PANI sensor. Moreover, the DSP20 sensor demonstrated a rapid response and recovery rate at the concentration of 10 ppm NH3, with response and recovery times of 182 s and 86 s.
研究领域:
材料科学
·
纳米技术
·
气体传感
·
化学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）