Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2021
·
IF 2.168
Yanyang Gao,Wanqiu Liu,Liuyan Tang,Yanan Zhu,Jinqing Qu
As the laws about emission of volatile organic compounds (VOCs) become more and more stringent, low VOC content coatings, such as high solid polyurethane coating, gradually attract great attention. Herein, a series of star-shaped hydroxyl polyesters (SHPs) were synthesized by methyl hexahydrophthalic anhydride (MHHPA), diisopropanolamine (DIPA), and monoglycidyl ether. The number of their average molecular weights is ranged from 913 to 1390 with 1.55–1.75 of PDI. The viscosities of SHPs are low to 1060 mPa·s. The molecular structures of SHPs were characterized by Fourier transform infrared (FTIR) and 1H nuclear magnetic resonance (1H NMR) spectroscopies. The high-solid two-component polyurethane coatings (2 K-PU) from SHP-3 have a 65% of the solid contents and exhibit 20 mPa·s of the applied viscosity with 310 g/L of VOC contents. Moreover, the polyurethane film displays high coating hardness up to 2H, as well as excellent chemical resistance and good thermal stability.
研究领域:
高分子科学
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材料工程
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涂料技术
·
环境化学
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DOI
高影响因子
BIOMATERIALS
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2010
·
IF 7.365
Xingyu Chen,Wei Wu,Zhizhang Guo,Jianyu Xin,Jianshu Li
A glucose-sensitive multilayer film was fabricated by the layer-by-layer (LbL) assembly method with positively charged 21-arm poly[2-(dimethylamino)ethyl methacrylate] (star PDMAEMA) and negatively charged insulin and glucose oxidase (GOD) in the form of {(Star PDMAEMA/Insulin) 4 + (Star PDMAEMA/GOD) 4 + Star PDMAEMA}. The multilayer film shows an on-off regulation of insulin release in response to stepwise glucose challenge in vitro . It is found that the unique structure of star PDMAEMA and interdiffusion of charged insulin are the main factors to control the on-off status of the film. Reversible surface morphology transitions of the multilayer film were also observed, revealing a phase separation and large-scale reorganization process. Furthermore, the multilayer film could continuously release enough insulin in vivo after being subcutaneously implanted in streptocozotin-induced diabetic rats and reduce the blood glucose level for at least two weeks. It is indicated that such system may have substantial potential as a glucose-sensitive carrier for insulin due to its distinct mechanism.
研究领域:
生物材料学
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医学工程
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药物递送系统
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DOI
高影响因子
Polymer Chemistry
·
2017
·Vol. 8
·期 20
·3177-3185
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IF 5.375
Ailian Wang,Hao Xu,Xu Liu,Rui Gao,Shi Wang,Qian Zhou,Jie Chen,Xiangfeng Liu,Liaoyun Zhang
This research provides an effective approach to synthesize a hyperbranched star polymeric ionic liquid (HBPS-(PVIMBr)x) with a hyperbranched polystyrene core and poly(1-butyl-3-vinylimidazolium bromide) arms via a combination of atom transfer radical self-condensing vinyl polymerization (ATR-SCVP) and RAFT polymerization. The synthesis process ensures good structural controllability and consistency that all of the arms of the star polymers are ionized. The obtained star polymeric ionic liquid shows good thermal stability with initial thermal decomposition temperatures above 290 °C. Moreover, after anion exchange, the TFSI− anion based hyperbranched star polymeric ionic liquid (HBPS-(PVIMTFSI)x) is used as the all-solid polymer electrolyte for lithium-ion batteries. The electrolytes (HBPS-(PVIMTFSI)x/LiTFSI) fabricated by the solution casting method exhibit a high room temperature ionic conductivity (4.76 × 10−5 S cm−1, the quantitative ratio of LiTFSI to the polymer matrix is 40%), a wide electrochemical window (4.9 V) and great interfacial compatibility.
研究领域:
高分子科学
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材料科学
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电化学
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能源存储
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DOI
高影响因子
POLYMER
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2018
·
IF 3.483
Hao Xu,Ailian Wang,Xu Liu,Di Feng,Shi Wang,Jie Chen,Yan An,Liaoyun Zhang
The trade-off between ionic conductivity and mechanical strength is still a great challenge for all-solid-state polymer electrolyte . Herein, a novel structure-controlled fluorine-containing star-branched polymer (HBPS-(PTFEMA- b -PPEGMA) 27 ) with a hyperbranched polystyrene core and polytrifluoroethyl methacrylate-block-poly (ethylene glycol) methyl ether methacrylate arms is synthesized by atom transfer radical polymerization . Combining the good mechanical strength of fluorine-containing segments and flexible property of PEG segments, the prepared HBPS-(PTFEMA- b -PPEGMA) 27 /LiTFSI solid polymer electrolyte can form flexible transparent self-standing membrane and exhibits the high ionic conductivity of 2.4 × 10 −5 S cm -1 at 25 °C, as well as good thermal stability with the thermal decomposition temperature of 374.7 °C. It also possesses a wide electrochemical window of 4.9 V and good interfacial compatibility. Moreover, the Li/LiFePO 4 cell based on this solid state star-branched polymer electrolyte membrane delivers a high discharge capacity of 147.2 mAh g −1 under a current density of 0.1C at 60 °C.
研究领域:
材料科学
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电化学
·
聚合物化学
·
能源存储
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 48
·20332-20342
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IF 2.7
Guanghao Mao,Huaxin Yang,Shuhang Deng,Wenyu Cao,Ping Deng,Yan Yu
A pair of star-like conjugated isomers (Tetra-8-IQ and Tetra-9-IQ) with indolo[2,3-b]quinoxaline as the star arm and tetraphenylethylene as the star core have been designed and synthesized. A comparative study has been conducted on the structural characteristics, electronic energy levels, spectral absorption, aggregation-induced emission, acid-stimulus response, and fluorescent applications of the two isomers. The results show that Tetra-8-IQ has lower lowest unoccupied molecular orbital/highest occupied molecular orbital energy levels, more redshifted optical absorption, and stronger fluorescence emission than Tetra-9-IQ. The two isomers are novel organic fluorescent materials as they both possess aggregation-induced emission characteristics and reversible acidichromism features. Tetra-8-IQ and Tetra-9-IQ were successfully applied in filter paper test strips and PMMA-based blending film to achieve fluorescent switch signals. Based on these findings, the INHIBIT and IMPLICATION molecular logic gates were successfully established, where acid and base were adopted as the input stimuli.
研究领域:
有机化学
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材料科学
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光化学
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DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 99
·81482-81491
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IF 3.84
Xuefei Leng,Zhiyong Wei,Yingying Ren,Yang Li,Yurong Wang,Qinyi Wang
In this work, two series of linear-comb and star-comb well defined graft poly(L-lactide) (PLLA) have been synthesized conveniently by one-pot ring-opening polymerization (ROP) of L-lactide using functionalized polybutadiene macroinitiators. The used organocatalyst of 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU) allows the polymerization of L-lactide to proceed rapidly at room temperature. Kinetic studies of the ROP reaction in this system indicate first-order kinetics in monomer concentration. 1H NMR and GPC techniques are employed to characterize the synthesized polymers, validating the formation of the desired comb structures with controllable chain length. Linear-comb and star-comb graft PLLA were comparatively studied as well as with linear PLLA by DSC and POM. The results reveal that the comb structure gives a remarkable improvement of PLLA crystallization ability in both crystallinity and growth rate of spherulites. Furthermore, the more compacted star-comb structure imposes restriction on chain mobility, which weakens the growth effect to some extent. It is found that the glass transition temperature (Tg) and melting temperature (Tm) significantly depend on the side chain length and backbone structure. Rheological studies of both melt and instinct viscosity of the solution show that star-comb PLLA has the lowest hydrodynamic volume compared with linear-comb PLLA and linear PLLA.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2011
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IF 3.068
Xiujuan Huang,Yan Xiao,Meidong Lang
Comicellization of a star block copolymer poly( ε -caprolactone)- block -poly(diethylamino)ethyl methacrylate (S(PCL- b -PDEAEMA)) and a linear block copolymer methoxy poly(ethylene glycol)- block -poly( ε -caprolactone) (mPEG- b -PCL) was developed to enhance the stability and lower the cytotoxicity of the micelles. The two copolymers self-assembled into the mixed micelles with a common PCL core surrounded by a mixed PDEAEMA/mPEG shell in aqueous solution. This core–shell structure was transformed to the core–shell–corona structure at high pH due to the collapse of the PDEAEMA segment. The properties of the polymeric micelles were greatly dependent on the weight ratio of the two copolymers and the external pH. As increasing the mPEG- b -PCL content, the size and the zeta potential of the mixed micelles were lowered while the pH-dependent stability and the biocompatibility were improved. Moreover, an increase in pH accelerated the release of indomethacin (IND) from the mixed micelles in vitro . These results augured that the mixed micelles could be applied as a stable pH-sensitive release system.
研究领域:
高分子科学
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药物递送
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纳米医学
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生物材料
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胶体与界面化学
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DOI
高影响因子
Processes
·
2023
·Vol. 11
·期 12
·3429
·
IF 3.5
Fan Shu,Weilin Chen,Gang Liu
Quantum dots (QDs) are emerging as promising candidates for innovative memristive materials, owing to their distinct surface, quantum size, and edge effects. Recent research has focused on tailoring QDs with specific organic molecules to fine-tune charge transfer states between the host and grafted species, as well as enhancing their dispersibility and processability. Violet phosphorus (VP), a newly discovered two-dimensional phosphorus allotrope, offers excellent carrier dynamics, predictable modifiability, and superior oxidation resistance, making it a promising contender in this domain. In this study, we synthesized a rich azobenzene-containing star-shaped polymer diazonium salt (AzoSPD) to functionalize violet phosphorus quantum dots (VPQDs), with the dual objectives of enhancing organic dispersibility and introducing photo-switching capabilities. The synthesized AzoSPD–VPQDs exhibit intramolecular charge transfer characteristics under electrical stimuli of ambient conditions, displaying significant non-volatile rewriteable memory properties and a substantial switching ratio exceeding 2 × 103. Furthermore, the high resistance state (HRS) current can be enhanced by nearly 40 times under 465 nm illumination, enabling optoelectronic information sensing and storage within a single device. This work not only provides insights into enhancing the optoelectronic properties of QDs through functional organic molecular modification but also represents a pioneering exploration of the potential applications of VPQDs in novel memristors.Keywords:violet phosphorus quantum dots;star-shape polymer diazonium salt;memristor;charge transfer mechanism;photoelectric regulation
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产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Jialin Li,Shanshan Zhou,Hao Pang,Yuewen Huang,Bin Wang
Star-shaped superplasticizers exhibited excellent dispersion performance on cement paste , but the molecular structure remained poorly controlled. This study develops three star-shaped block superplasticizers via atom transfer radical polymerization to investigate their effects on fluidity and early hydration in the Portland cement system. The three star-shaped block superplasticizers with acid to ether monomer ratio of 28, 36 and 100, are marked as SPCE-1, SPCE-2 and SPCE-3 respectively. Fluidity test shows that SPCE-1 and SPCE-3 with higher hydrodynamic radius exhibit better initial fluidizing effect than SPCE-2. Besides, there is competitive adsorption of SPCEs between the clinker phase and nano-ettringite in pore solution. SPCE-1 behaves best in fluidity retention due to the increase of adsorption amount over hydration time. A dispersion mechanism based on the extended-DLVO theory was proposed that SPCEs reduce hydrophobic interaction between cement grains and prevent agglomeration between cement grains and air bubbles.
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产品关联
DOI
高影响因子
DRUG DEVELOPMENT AND INDUSTRIAL PHARMACY
·
2019
·
IF 2.367
Jieqiong Lv,Runcheng Liang,Zihua Xia,Yong Li,Zhufen Lv,Dongzhi Hou,Liping Yu,Gang Chen,Yi Liu,Fan Yang
Purpose: A series of β-CD amphiphilic star-shaped copolymers with exceptional characteristics were synthesized and their potential as carriers for micelles drug delivery was investigated.Methods: A series of amphiphilic copolymers based on β-CD were synthesized by introducing poly (acrylic acid)-co-poly(methyl methacrylate)-poly (vinyl pyrrolidone) or poly (acrylic acid)-co-poly(methyl methacrylate)-co-poly(monoacylated-β-CD)-poly (vinyl pyrrolidone) blocks to the primary hydroxyl group positions of β-CD. The micellization behavior of the copolymers, the synthesis conditions, characteristics, drug release in vitro and tissue distribution of vinpocetine (VP) micelles in vivo were investigated.Results: Around 60 types of β-CD amphiphilic star-shaped copolymers were successfully synthesized and the critical micelle concentration ranged from 9.80 × 10−4 to 5.24 × 10−2g/L. The particle size, drug loading and entrapment efficiency of VP-loaded β-CD-P4 micelles prepared with optimal formulation were about 65 nm, 21.44 ± 0.14%, and 49.05 ± 0.36%, respectively. The particles had good sphericity. The cumulative release rates at 72 h of VP-loaded β-CD-P4 micelles in pH 1.0, pH 4.5, pH 6.5, or pH 7.4 media were 93%, 69%, 49%, and 43%, respectively. And, the lung targeting efficiency of VP-loaded β-CD-P4 micelles was 8.98 times higher than that of VP injection.Conclusion: The VP-loaded β-CD-P4 micelles exhibited controlled-release property, pH-induced feature and lung targeting capacity compared with VP injection, suggesting that the β-CD-P4 copolymers are an excellent candidate for micelles drug delivery.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 18
·47458
·
IF 2.188
Xuelian Wei,Huan Hu,Xian Li,Qiang Yin,Li Fan,Yawen Huang,Junxiao Yang
With the development of ultralarge-scale integrated circuits, polymers with low dielectric constant and high thermal stability have aroused great interest. We prepared two novel bridged siloxane-based benzocyclobutene (BCB) star-shaped monomers, tetrakis[dimethyl siloxy-4-(1′,1′-dimethyl-1′-ethyl silicon)-benzocyclobutene] (TDSDES-BCB) and tetrakis(hexamethyl siloxane vinyl-benzocyclobutene) (THSV-BCB), and the corresponding resins were obtained by curing. The structures of TDSDES-BCB and THSV-BCB were confirmed by 1 H-NMR, 13 C-NMR, and 29 Si-NMR spectra and time-of-flight mass spectrometry analysis. The curing behavior of these monomers was investigated by Fourier transform infrared spectroscopy and differential scanning calorimetry. The dielectric constant of cured TDSDES-BCB is only 2.43 at 10 MHz (that of THSV-BCB is 2.46). In addition, these resins display high thermal stability: the 5 wt % weight loss temperature of cured TDSDES-BCB is about 467 °C (454 °C for THSV-BCB resin). The excellent low dielectric property is attributable to the free volume created by the star-shaped structure and crosslinked network structure of BCB after curing. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47458.
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 28
·15604-15612
·
IF 2.936
Na Xu,Xiaobei Huang,Guangfu Yin,Meijiao Bu,Ximing Pu,Xianchun Chen,Xiaoming Liao,Zhongbing Huang
In contrast with traditional chemotherapy, controlled drug delivery systems provide many advantages. Herein, a thermosensitive star polymer pompon with a core–arm structure was synthesized using a grafting-on method as a thermo-responsive controlled release drug carrier. Single-chain cyclized/knotted poly tetra(ethylene glycol) diacrylate (polyTEGDA) was used as the hydrophobic core, and thermosensitive linear poly(N-isopropylacrylamide-co-N-methylolacrylamide) (poly(NIPAM-co-NMA)) was selected as the hydrophilic arm. Below or above its lower critical solution temperature (LCST), the linear poly(NIPAM-co-NMA) grafted onto the polyTEGDA core adopted a stretched or curled status, respectively, then the drug could be loaded in or extruded out. The LCST of star polyTEGDA-b-poly(NIPAM-co-NMA) was adjusted to slightly above body temperature (37 °C). The antitumor drug doxorubicin (DOX) was successfully loaded into the pompons with a high loading capacity of 19.45%. The cumulative release of DOX from loaded pompons in vitro for 72 hours was 71% and 20.7% at 42 °C and 37 °C, respectively, indicating that the excellent temperature-controlled release characteristics result from the unique thermo-responsive extrusion effect. Moreover, DOX loaded polyTEGDA-b-poly(NIPAM-co-NMA) pompons achieved better antitumor ability against ovarian carcinoma SKOV3 cells at 42 °C compared with that at 37 °C. These results suggest that star polyTEGDA-b-poly(NIPAM-co-NMA) pompons have considerable promise as thermo-responsive controlled drug delivery carriers.
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产品关联
DOI
PubMed
高影响因子
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