POLYMER INTERNATIONAL
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2021
·Vol. 70
·期 12
·1680-1691
·
IF 2.99
Haolan Gou,Bowen Zhang,Wei Wei,Xiaoma Fei,Xiaojie Li,Xiaoya Liu
Latent curing accelerators are essential for application to one-component epoxy systems in various industries, such as coatings, adhesives and electronic packaging. Herein, we developed organic–inorganic hybrid microcapsules encapsulating triphenylphosphine (TPP) by Pickering emulsion polymerization of styrene and methoxyethyl methacrylate with dimethoxydiphenylsilane-modified silica nanoparticles as emulsifiers. The microcapsules were further surface-modified by epoxy silane and employed as a thermal latent curing accelerator for an epoxy/anhydride system. Good dispersibility and interfacial bonding of the hybrid microcapsules with the resin matrix were observed. Compared with TPP, the microcapsule-type accelerator endowed the one-component epoxy curing system with significantly enhanced storage stability at room temperature of 25 °C (a pot life of 20 days) and a comparable curing activity at high temperature. The activity of the encapsulated accelerator can be blocked and released rapidly and effectively with increasing temperature to trigger the segmental motion of the polymeric microcapsules. Furthermore, the addition of microcapsules increased the glass transition temperature and thermal stability of the epoxy thermosets owing to the organic–inorganic hybrid character. Moreover, the toughness of the cured resin was also improved. Therefore, the latent curing accelerator demonstrated a promising prospect for application in high-performance one-pot epoxy formulations. © 2021 Society of Industrial Chemistry.
研究领域:
材料科学
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化学工程
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高影响因子
POLYMER INTERNATIONAL
·
2023
·Vol. 72
·期 7
·664-670
·
IF 3.2
Bin Li,Mengjing Zhou,Xiaojia Xu,Jizhen Liu,Wenrui Hao,Aolin Wu
Choline chloride, acrylamide (AM) and acrylic acid (AA) were used as raw materials to prepare deep eutectic solvent, and β-cyclodextrin (β-CD) was used as filler to prepare β-CD/P(AM- co -AA) composite hydrogel by frontal polymerization. The composite hydrogel was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The pH response, mechanical properties and self-healing of the hydrogel were studied. The results show that AA contains easily ionized –COOH, which makes the composite hydrogel have excellent pH response and super-high swelling ratio under alkaline conditions. With the addition of β-CD, due to the increase of hydrogen bonds and the combination of β-CD and polymer chains the mechanical properties of the hydrogel are obviously improved and the tensile strength and compressive strength are increased by 4.12 and 2.26 times respectively. The introduction of β-CD can improve the self-healing performance of the composite hydrogel. With the increase of β-CD content, the healing rate and healing speed of the composite hydrogel show an upward trend. In this study, a simpler and faster method is proposed to prepare self-healing composite hydrogel with excellent mechanical properties and pH responsiveness. The self-healing property and the existence of a hydrophobic cavity of β-CD make β-CD/P(AM- co -AA) composite hydrogel have potential application in wound healing. © 2023 Society of Industrial Chemistry.
研究领域:
材料科学
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生物医学工程
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高影响因子
POLYMER INTERNATIONAL
·
2023
·Vol. 72
·期 8
·704-710
·
IF 3.2
Dong Wang,Pengxuan Zheng,Zhiwei Yu,Xiangwei Wang,Tingxi Li
Polymer electrolytes are being considered as an effective solution for electrochemical devices to replace currently used organic liquid electrolytes due to their excellent mechanical properties and security. Herein, we prepared stretchable polymer electrolytes (SPEs) doped with poly[(2-acrylamido-2-methylpropanesulfonic acid)- co -poly(ethylene glycol) dimethacrylate] (P(AMPS- co -PEGMA)) and enhanced with poly[(vinylidene fluoride)- co -hexafluoropropylene] (PVDF-HFP), through UV in situ polymerization. The SPEs showed good mechanical performance with an elongation of more than 40% and ionic conductivity reaching the order of 10 −3 S cm −1 . In terms of application, flexible electrochromic devices based on the UV in situ -prepared SPEs were assembled, the color switching performance being still good even after 400 switching cycles and 1000 bending cycles, which indicated that the SPEs could have excellent prospects in application for flexible devices. © 2023 Society of Industrial Chemistry.
研究领域:
材料科学
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电化学
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高影响因子
POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 11
·1579-1586
·
IF 2.07
Lanxia Zhao,Xia Zhang,Xin Liu,Juan Li,Yuxia Luan
The synthesis, characterization and potential application in the doxorubicin (Dox) delivery system of a biodegradable polypeptide-based block copolymer, poly(ethylene glycol) 2000 -poly(ϵ-caprolactone) 6000 -poly(glutamic acid) 1000 (PEG 2000 -PCL 6000 -PGA 1000 ), was investigated. The copolymer was synthesized via ring-opening polymerization and characterized by 1 H NMR and Fourier transform IR. The synthesized copolymer could self-assemble into aggregates and the critical aggregation concentration was 0.23 mg mL −1 . Transmission electron microscopy indicated that spherical polymersomes formed with a desirable size about 180 nm. Therefore Dox was encapsulated into these polymersomes, and then we investigated its applications in a drug delivery system. These Dox-loaded polymersomes (PolyDox) were characterized by dynamic light scattering, zeta potential and pH responsiveness measurements. In vitro drug release indicated that the release rate of drug from PolyDox was pH-responsive and significantly decreased. The drug pharmacokinetic parameters were improved in comparison to the group treated with free Dox, which proved the prolonged Dox release from PolyDox. A WST-1 assay indicated a low toxicity and good compatibility of copolymer to cells within 48 h. The results also showed that PolyDox appeared to induce a higher anti-tumor effect. Cell uptake results indicated that PolyDox displayed higher cellular uptake in A549 cells. Endocytosis inhibition results demonstrated that the internalization of PolyDox was mostly mediated by the fluid-phase endocytosis pathway. © 2017 Society of Chemical Industry
研究领域:
药学
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材料科学
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生物医学工程
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癌症研究
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 11
·1530-1537
·
IF 2.07
Xuewen Guo,Xin Liu,Hongying Su,Shaoyun Shan,Qingming Jia
Photoresists involving polymer solubility and degradation play a crucial role in the manufacture of integrated circuits by photolithography. Conventional photoresists typically rely on a single switching mechanism based on a change in either polarity or molecular weight of the polymer. Here we report a new type of poly(olefin sulfone) as a photoresist which overcomes the drawback of poor dry etching resistance, solubility and thermal degradation. The effects of different side-chain groups (acetyl, acetoxy and carboxylic acid) of norbornene on the properties of poly(norbornene sulfone)s were analyzed with the aim of developing a new type of photoresist. Thermogravimetry and gel permeation chromatography results revealed that bond breaking occurred at different temperatures, because of the different side-chain groups, and the three side-chain groups affect the solubility and stability of the poly(norbornene sulfone)s. A novel photoresist material based on a poly(olefin sulfone) with different side-chain groups was synthesized and its physical properties examined. © 2017 Society of Chemical Industry
研究领域:
材料科学
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化学工程
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 11
·1598-1609
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IF 2.07
Peikun Zhang,Yang Zhou,Hui Su,Hong Lin,Saiqi Tian,Yi Chen,Jun Yan,Yazhou He,Haojun Fan
Despite being extensively implemented in research, it remains challenging but highly desirable to develop ammonium polyphosphate (APP)-based polyurethane (PU) combining excellent flame retardancy and improved mechanical properties. Herein, hydroxyl-decorated APP (OH-APP) was successfully fabricated through a facile, green, yet efficient cation exchange reaction with N -methylethanolamine, and utilized as a multifunctional reinforcing agent for solvent-free two-component PU in the curing process. Results demonstrate that the conjugation of OH-APP imparts to the resultant cured PU samples (PU/OH-APP) enhanced fire safety and smoke suppression performance, as evidenced by the considerable decrease in peak heat release rate, total heat release, peak smoke production rate and total smoke production by 75.4, 30.1, 64.3 and 14.4% over those of pure PU. Furthermore, the tensile strength of PU/OH-APP is improved by 66.5%, while the ductility is well maintained, highlighting its promising potential in industrial applications. This work is aimed at opening a new avenue for the development of APP-based PU with outstanding performances through covalent anchoring approaches. © 2017 Society of Chemical Industry
研究领域:
材料科学
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化学工程
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高影响因子
POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 11
·1633-1639
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IF 2.07
Nafeesa Mushtaq,Lala Rukh Sidra,Guofei Chen,Yongmei Tang,Lubo Xu,Xingzhong Fang
A series of cardo based asymmetric polyimides containing bulky rigid naphthalimide and phthalimide groups were prepared from asymmetric monomer bishaloimide and bisphenols by solution polycondensation. Bishalo(naphthalimide-phthalimide) monomers containing different terminal leaving groups (Cl, F, NO 2 ) were synthesized, and the reactivity difference of these monomers was compared for the successful synthesis of polyimides. The inherent viscosities of the polyimides were in the range 0.51 − 0.60 dL g −1 in N -methyl-2-pyrrolidone at 30 °C. These polyimides demonstrated good organosolubility and mechanical properties with tensile strengths of 93 − 120 MPa, tensile moduli of 3.5 − 5.3 GPa and elongations at break of 2.8% − 4.3%. The polyimides showed high glass transition temperatures ( T g ) ranging from 330 to 363 °C. The 10% weight loss ( T 10% ) of asymmetric polyimides reached 436 − 500 °C in nitrogen and 417 − 476 °C in air. The water uptake of the polyimides was in the range 0.35% − 0.72%. © 2017 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 12
·1827-1833
·
IF 2.07
Jian Zhao,Yanlei Liu,Jianglong Cheng,Shengming Wu,Zhaobo Wang,Haiqing Hu,Chunhua Zhou
Solvent-exfoliated graphene (SEG)-reinforced polystyrene (PS) composites were prepared using a straightforward solution-casting method. SEG sheets, obtained by sonication-assisted solvent direct exfoliation from natural graphite, were well dispersed in the PS matrix as evidenced from scanning electron microscopy and transmission electron microscopy observations. Addition of 0.5 wt% SEG resulted in a 6% increase in tensile strength and a 77% improvement in Young's modulus over pure PS due to the effective load transfer between SEG and PS matrix. The Young's moduli of the PS/SEG composites were obtained from both tensile experiments and calculations using the well-established Halpin–Tsai model. Results from dynamic mechanical analysis indicated that the storage modulus of the PS/SEG composites was significantly improved relative to neat PS. The glass transition temperatures of the composites were found to increase substantially upon addition of SEG, consistent with differential scanning calorimetry analysis. © 2017 Society of Chemical Industry
研究领域:
材料科学
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复合材料
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2014
·Vol. 63
·期 7
·1154-1158
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IF 2.247
Longqiang Xiao,Yan Li,Xiangxiang Jia,Liqiong Liao,Lijian Liu
The present contribution describes an innovation in the copolymerization of cyclic monomers, ε -caprolactam ( ε -CL) and 2,2-dimethyltrimethylene carbonate (DTC), with ethyl diazoacetate (EDA). The characterizations of the obtained copolymers, poly(EA- ran -EDA- ran-ε -CL) and poly(EA- ran -EDA- ran -DTC) (where EA refers to the ethyl acetate group from EDA after nitrogen release), were performed using 1 H NMR and 13 C NMR spectroscopies and size exclusion chromatography. Under optimized conditions, the copolymer of ε -CL with EDA possessing a number-average molar mass ( M n ) of 1300 g mol −1 and dispersity of 2.12 as well as that of DTC with EDA with M n of 8000 g mol −1 and dispersity of 1.47 were obtained. The incorporation of the azo group in the obtained copolymers was determined from the results of elemental analysis (3.30–10.22% nitrogen) and Fourier transform infrared spectroscopy. Furthermore, the thermal properties of the obtained copolymers were examined using differential scanning calorimetry. X-ray diffraction results showed that the synthesized copolymers were amorphous. © 2014 Society of Chemical Industry
研究领域:
高分子化学
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材料科学
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高影响因子
POLYMER INTERNATIONAL
·
2014
·Vol. 64
·期 3
·405-412
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IF 2.247
Tian Lan,Yu Zhang,Haiping Wang,Liping Yang,Wenjie Yang,Yinghan Wang
Aiming to decrease the memory effect of polymer-dispersed liquid crystals (PDLCs), a type of graft macroinitiator, synthesized by reversible addition–fragmentation chain transfer and atom transfer radical polymerization, was employed to prepare PDLCs with graft copolymer matrix in our previous work. Compared with linear copolymer matrix PDLCs prepared using a linear macroinitiator, it was found that, although low-memory-effect PDLCs were obtained, the driving voltage and transmittance of the PDLCs were unfortunately sacrificed to some extent. Thus, it is necessary to improve the electro-optical properties of PDLCs on the basis of the original research performed by us. In the work reported in this article, a kind of linear macroinitiator with high refractive index and another graft macroinitiator with flexible branched chains were employed to prepare PDLCs. The results showed that by using mixed macroinitiators, the electro-optical properties of PDLCs could be improved, and a possible mechanism is proposed.
研究领域:
材料科学
·
高分子化学
·
光学材料
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2014
·Vol. 64
·期 4
·477-485
·
IF 2.247
Funian Mo,Faxing Zhou,Shaojun Chen,Haipeng Yang,Zaochuan Ge,Shiguo Chen
In this study, a series of shape memory polyurethanes (SMPUs) were synthesized successfully by the bulk polymerization method from liquefied 4,4′-diphenylmethane diisocyanate (L-MDI), 1,4-butanediol (BDO) and polyethylene glycol (PEG). The influence of the hard segment content (HSC) on the structure, morphology, properties and biocompatibility of PEG based SMPUs (PEGSMPUs) was carefully investigated. The results show that a microphase separation structure composed of a semicrystalline soft phase and an amorphous hard phase is formed in the PEG6000/L-MDI/BDO system. Crystallization of the PEG soft segment is influenced by the hard segments. The PEG semicrystalline soft phase serves as a reversible phase while the L-MDI−BDO hard segment acts as physical netpoints. Finally, a cyclic tensile test shows that all PEGSMPUs have good shape recovery (e.g. above 80%), whereas good shape fixity can only be achieved when the HSC is less than 35 wt%. The Cell Counting Kit 8 assay also demonstrates that only PEGSMPUs containing less than 40 wt% HSC have low cytotoxicity. It is thus concluded that PEGSMPUs bearing both good shape memory effects and good biocompatibility can be used as shape memory materials for biomedical applications when the HSC is less than 35 wt%. © 2014 Society of Chemical Industry
研究领域:
材料科学
·
生物医学工程
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高影响因子
POLYMER INTERNATIONAL
·
2014
·Vol. 64
·期 5
·647-653
·
IF 2.247
Ping Liang,Chao-Qun Wang,Hong Chen,Ren-Xi Zhuo,Si-Xue Cheng
A facile strategy for the fabrication of multi-functional polymer/inorganic hybrid nanoparticles for efficient gene and drug co-delivery was developed. A therapeutic gene (p53 plasmid) and a chemotherapy drug (doxorubicin hydrochloride, DOX) were co-loaded simultaneously in hybrid nanoparticles during co-precipitation with high encapsulation efficiency. The prepared heparin–biotin/heparin/CaCO 3 /calcium phosphate/DNA/DOX (HPB/HP/CaCO 3 /CaP/DNA/DOX) nanoparticles exhibited pH sensitivity and tumor-targeting property due to the presence of the CaCO 3 /CaP inorganic component and biotin moiety in the polymer chain, respectively. For comparison, HPB/HP/CaCO 3 /CaP/DOX hybrid nanoparticles for drug delivery were also fabricated. The cell inhibition effects of different nanoparticles on HeLa cells were evaluated using methylthiazole tetrazolium assay. In vitro study indicated that the gene and drug co-delivery system (HPB/HP/CaCO 3 /CaP/DNA/DOX) showed a stronger cell growth inhibition effect as compared with the drug delivery system (HPB/HP/CaCO 3 /CaP/DOX), indicating that HPB/HP/CaCO 3 /CaP/DNA/DOX hybrid nanoparticles could effectively mediate gene transfection and deliver the drug. The hybrid nanoparticles with good biocompatibility have great promise for gene and drug co-delivery. © 2014 Society of Chemical Industry
研究领域:
纳米技术
·
药剂学
·
分子生物学
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生物医学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）