POLYMER INTERNATIONAL
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2013
·Vol. 62
·期 9
·1358-1367
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IF 2.125
Gang Zhang,Dong-ting Bai,Dong-sheng Li,Sheng-ru Long,Xiao-jun Wang,Jie Yang
Two kinds of monomers containing thioether units 4,6-bis(4-chloroformylphenylthio)pyrimidine (BPPM-DC) and 3,6-bis(4-chloroformylphenylthio)pyridazine (BPPD-DC) were synthesized by two steps and were reacted with diamine-containing thioether (−S–) and sulfone units to prepare a kind of polyamide containing heterocycles and high contents of thioether groups. These polyamides had good optical properties, including an optical transmittance of the aromatic polyamide film at 450 nm that was higher than 87%. Additionally, the pyridazine, pyrimidine and the large quantity of thioether units provided the polymers with high refractive indices of 1.722–1.732 and low birefringences of 0.004–0.006. These polyamides were also found to have good thermal properties. They showed improved solubility in polar aprotic solvents and could form tough films with a tensile strength of 79.2–112.3 MPa and a storage modulus of 1.4–2.4 GPa (at 200 °C).© 2013 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
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高影响因子
POLYMER INTERNATIONAL
·
2013
·Vol. 62
·期 12
·1684-1691
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IF 2.125
Jun Yang,Yuanrong Cheng,Yunxia Jin,Fei Xiao
Two kinds of novel benzocyclobutene (BCB) functionalized monomers were synthesized through imidization of siloxane-containing dianhydride with 4-aminobenzocyclobutene. The BCB monomers obtained exhibited good solubility in various organic solvents. They were converted into crosslinked polymer via ring opening and the following Diels–Alder reaction at proper temperature. The curing kinetics were studied by non-isothermal differential scanning calorimetry. The BCB polymers showed good thermal stability, excellent dielectric properties, low water absorption and good planarization. Moreover, the thermal and mechanical properties of the BCB resins could be adjusted by the length of the siloxane unit. The BCB resins with a shorter siloxane chain exhibited higher glass transition temperature, higher modulus and lower coefficient of thermal expansion than BCB resins with longer chains. © 2013 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 6
·876-881
·
IF 2.07
Zuoqiang Wu,Jianhua Han,Nan Li,Zhihuan Weng,Jinyan Wang,Xigao Jian
High curing temperature (including post-curing temperature) and long curing time of phthalonitrile resins make them thermally stable but difficult to process. In this paper, novel mixed curing agents (CuCl/4,4′-diaminodiphenylsulfone (DDS) and ZnCl 2 /DDS) were firstly designed for solving these problems. Bisphenol-based phthalonitrile monomer (BP-Ph; melting point: 228–235 °C) was synthesized and used as the curing precursor. Differential scanning calorimetry results indicated that BP-Ph cured with CuCl/DDS and ZnCl 2 /DDS exhibited curing temperatures close to the melting point of BP-Ph with curing ending temperatures of 225.4 and 287.1 °C, respectively. Rheologic investigations demonstrated obvious curing reactions of BP-Ph occurred with the mixed curing agents at 220 °C. Thermogravimetric analysis showed that BP-Ph cured by CuCl/DDS or ZnCl 2 /DDS maintained 95% mass at 573 or 546 °C, respectively, at a post-curing temperature of 350 °C for 2 h. Reasonable long-term thermo-oxidative stability was also demonstrated. When the post-curing temperature decreased to 290 °C, char yield at 800 °C of BP-Ph cured by CuCl/DDS was 77.0%, suggesting the curing procedure can be milder when using mixed curing agents. © 2017 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
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高影响因子
POLYMER INTERNATIONAL
·
2024
·
IF 2.9
Shuai Li,Wanli Ye,Yiqiu Tan,Tairui Qiu,Dehua Hou,Xiaoyu Chang
Phase-change microcapsules, consisting of urea-melamine-formaldehyde as the shell material and n -tetradecane as the core material, offer effective temperature regulation within concrete under low-temperature conditions, mitigating the impact of freeze–thaw cycles. However, their incorporation can exert a notable influence on concrete strength. In this study, microcapsules were utilized as an admixture, and nano-silicon dioxide replaced an equivalent amount of cement to prepare modified phase-change concrete, focusing on investigating mechanical properties. Results indicate that under consistent parameters—emulsifier concentration of 10% and an oil–water ratio of 1:6—the produced microcapsules exhibit uniform dispersion, with particle sizes ranging from 10 to 20 μm and latent heat of phase change reaching 117 J g −1 . Incorporating microcapsules reduced concrete strength, with a decrease in compressive strength within the range of 15% when microcapsule dosage was set at 10%. On the other hand, nano-silica demonstrated the capability to significantly enhance the strength of phase-change concrete by 15%–30% at dosages ranging from 5% to 10%. Optimal enhancement in concrete strength was achieved when phase-change microcapsules were dosed at 10% and nano-silica replaced 10% of the cement mass, resulting in compressive strength reaching 90% of normal concrete. © 2024 Society of Industrial Chemistry.
研究领域:
材料科学
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土木工程
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高影响因子
POLYMER INTERNATIONAL
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2019
·Vol. 69
·期 2
·140-148
·
IF 2.433
Jianhua Zhou,Jiaojiao Zhao,Yanjiao Cui,Wenjing Cheng
A novel kind of bifunctional nanoencapsulated phase change material with thermal energy storage and ultraviolet absorption functions was successfully prepared through surfactant-free emulsion polymerization with reactive emulsifiers. These nanocapsules consisted of n-octadecane and n-butyl stearate as binary core materials and polyacrylate supplemented with titanium dioxide nanoparticles (nano-TiO2) as hybrid shell materials. The experimental results show that the monomer conversion and thermal conductivity increased and the particle size and distribution decreased with increase in nano-TiO2 content when the nano-TiO2 dosage was below 0.2 wt%. Fourier transform infrared spectroscopy and XRD confirmed that the binary phase change materials were well encapsulated inside the polyacrylate-TiO2 hybrid shell and nano-TiO2 was also successfully crosslinked in the nanocapsules. TEM demonstrated that the synthesized nanocapsules exhibited a regular spherical profile and a well-defined core–shell structure with diameter ranging from 70 to 100 nm. In addition, the results obtained from DSC, TGA and UV–visible spectrophotometry showed that the as-prepared nanocapsules had good thermal storage capacity, thermal stability and ultraviolet absorption properties. It can be considered that the resultant nanoencapsulated phase change materials with polyacrylate-TiO2 hybrid shell may have high feasibility and hold good promise in the applications of intelligent thermoregulation fabrics. © 2019 Society of Chemical Industry
研究领域:
材料科学
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纳米技术
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热能存储
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纺织工程
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高影响因子
POLYMER INTERNATIONAL
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2019
·Vol. 69
·期 1
·110-120
·
IF 2.433
Danyi Li,Youhao Zhang,Li Yuan,Guozheng Liang,Aijuan Gu
It is difficult for the self-healing polyacrylate coatings reported so far to simultaneously achieve high mechanical strength and high self-healing efficiency within a short healing time. Herein, derived from multi-maleimide terminated hyperbranched polysiloxane, linear polyacrylate with furan-containing side chain and polydopamine particles (photothermal conversion agent), a new kind of polyacrylate coating (HPA) with a strong and flexible crosslinking network was developed, which simultaneously shows high mechanical strength and high self-healing efficiency within a short time. With 0.3 wt% polydopamine particles in HPA, the resulting coating (HPA3) has the highest toughness (2.63 ± 0.10 MPa) with 12.9 ± 0.7 MPa tensile strength and 23.9% ± 1.6% elongation at break; in addition, the self-healing efficiency of HPA3 is over 87.6% after only 2.5 min of near-infrared laser irradiation, overcoming intractable problems in developing self-healing polyacrylate coatings. A study of the mechanism behind these outstanding performances of the HPA system reveals that the reversible covalent crosslinking formed by multi-maleimide terminated hyperbranched polysiloxane is the necessary and crucial factor for simultaneously achieving high mechanical strength and high self-healing efficiency in a short time. © 2019 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
·
2020
·Vol. 70
·期 8
·1057-1064
·
IF 2.574
Chunhui Jiang,Tingjian Huang,Yuan Chen,Zexi Su,Xiang Yan,Qibin Xu,Mengjin Jiang,Pengqing Liu
To improve the antifouling properties of poly(ether ether ketone) (PEEK) membrane, negatively charged acrylic acid (AA), neutral ethyl hydroxyacrylate (HEA) and positively charged acryloxyethyl trimethylammonium chloride (DAC) as hydrophilic monomers were respectively grafted onto the PEEK hollow fiber membrane surface via ultraviolet irradiation polymerization. The effects of the grafted monomers on surface chemical structure, surface morphology, zeta potential, hydrophilic performance, permeability and the antifouling properties of the membrane were investigated in detail. The results show that the charge state of the membrane surface is closer to the monomer charge characteristic, which obviously affects the permeability and antifouling performance of the membrane. The pure water flux of the membrane grafted with neutral hydrophilic HEA monomer is increased and the antifouling properties to bovine serum albumin (BSA) and sodium alginate (SA) are also enhanced, while the pure water flux of the membranes grafted with negatively charged AA monomer or positively charged DAC monomer is decreased, with different antifouling properties to BSA and SA. Furthermore, the antifouling experiment with BSA under different pH conditions revealed that membrane fouling depends on the pH value, and membrane fouling was the most serious at the isoelectric point of BSA. © 2020 Society of Chemical Industry
研究领域:
材料科学
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环境工程
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高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 9
·1344-1355
·
IF 2.99
Zhi-Yuan Zhang,Li-Li Rui,Ya-Li Lin,Hui-Dan Zhang,Ji-Ming Ou,Jian-Feng He,Quan-Zhou Wu
Three-dimensionally ordered macroporous molecularly imprinted polymers (3DOM MIPs) were prepared for the direct purification of cinchona alkaloids from crude cinchona extract. The 3DOM MIPs were easily prepared by grafting quinine-MIPs on the pore walls of 3DOM thiol-group-functionalized silica. The materials were characterized using various techniques. The results showed that the 3DOM MIPs had a more regular macroporous structure, a greater surface area and a greater porosity than traditional bulk MIPs (TBMIPs). The 3DOM MIPs could reach a high MIP content of 69.9%. And the 3DOM structure could improve intraparticle adsorption and provide more accessible adsorption sites. Consequently, in both static adsorption experiments and solid-phase extraction (SPE), the actual adsorption capacity of the imprinted polymers of the 3DOM MIPs was about 83% higher than that of TBMIPs. Moreover, the 3DOM MIPs exhibited high affinity for quinine, quinidine and cinchonine. Using the quinine-3DOM MIPs as SPE sorbent, quinine, quinidine and cinchonine could be effectively purified from crude cinchona extract with high elution recoveries. Control experiments also showed that the 3DOM MIPs were superior to commercially available adsorbents in terms of the purification of cinchona alkaloids from crude extract. © 2021 Society of Chemical Industry
研究领域:
材料科学
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药物化学
·
分析化学
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高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 68
·期 1
·83-87
·
IF 2.352
Yajun Ren,Lei Wang,Xinxiang Cui,Libing Han,Qifeng Zhou,Xiaofeng Song
To create new biofunctional materials, a polycaprolactone-polysiloxane-polycaprolactone (PCL-PMVS-PCL) carrying lactose was developed by ring-opening polymerization and esterification reaction. 1 H NMR and Fourier transform IR spectroscopy confirmed synthesis of the product. Gel permeation chromatography and DSC were used to evaluate its molecular structure. With propagation of the PCL molecular chain, the copolymer transforms from the amorphous form to crystalline, and its solubility in chloroform is modified. Change of the lactose grafting ratio brings about little influence on the solubility of the grafted copolymer. The product exhibits good film-forming ability after chain extension. The results suggest that the grafted copolymer not only can form composites with commercial biodegradable polyester but also can be processed alone to serve for biomedical engineering. © 2018 Society of Chemical Industry
研究领域:
高分子科学
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材料科学
·
生物医学工程
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高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 65
·期 12
·1382-1386
·
IF 2.414
Yu Guan,Jingjing Li,Leishan Shao,Fei Wang,Dongyu Dong,Yinghan Wang
A new redox initiation system, potassium persulfate/ N , N -dimethylethanolamine, was used to initiate traditional radical emulsion polymerization of vinyl acetate at low temperature. Polymers were characterized using gel permeation chromatography, scanning electron microscopy and dynamic light scattering. The results showed that poly(vinyl acetate) with high molar mass and small dispersity (Đ) was successfully synthesized. © 2016 Society of Chemical Industry
研究领域:
高分子化学
·
材料科学
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高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 65
·期 10
·1150-1156
·
IF 2.414
Lu Shen,Ying Wang,Qiang Zhao,Fubin Luo,Junhua Chen,Mangeng Lu,Liyan Liang,Kun Wu,Jun Shi
The dimethacrylate reactive diluent (HEMA-DDSA), a long-side-chain-containing reactive diluent, was prepared by reacting 2-dodecen-1-ylsuccinic anhydride with two equivalents of hydroxyethyl methacrylate. Its structure was characterized by IR and 1 H NMR spectroscopy. This new diluent was added into the formulation of UV-curable epoxy acrylate networks. Results show that the formulation with the addition of HEMA-DDSA has massively reduced viscosity and shows several attractive properties of epoxy acrylate oligomers. The mechanical resistance of the films is dramatically enhanced with the incorporation of long alkyl groups derived from HEMA-DDSA, the plastic deformation zone expands, thus decreasing the inner stress of the polymer structure. Moreover, the cured coatings have a higher glass transition temperature as the percentage of HEMA-DDSA is increased up to 5 wt%. Due to the excellent integrated performance of the polymeric films, HEMA-DDSA proved to be an effective reactive diluent, which is of potential interest for applications in high performance materials. © 2016 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
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高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 65
·期 10
·1172-1178
·
IF 2.414
Shuyan Yang,Wenjian Wu,Yuanqi Jiao,Hongbo Fan,Zhuodi Cai
The plasticizing and thermostabilizing effect of poly(ethylene glycol)–polyhedral oligomeric silsesquioxane (PEG-POSS) on poly(vinyl chloride) (PVC) is discussed thoroughly in this work. As PEG-POSS content increases, PVC becomes more flexible and the decomposition temperature of PVC increases slightly. Meanwhile, the temperature of maximum HCl emission is elevated from 265.3 °C in neat PVC to 285.7 °C in PVC nanocomposites, with the peak intensity of HCl emission decreased by 30.8%, and a new lower intensity of HCl emission peak appearing at much higher temperature (around 370 °C), which is in accordance with the maximum degradation temperature of PEG-POSS. Thereby, a possible dehydrochlorination mechanism is suggested according to the fact that the electron donor effect of ether groups would stabilize the C Cl bonds by means of more electron cloud stacked in those bonds, which agrees with Fourier transform infrared and X-ray photoelectron spectroscopy experiments in terms of hydrogen bonds. © 2016 Society of Chemical Industry
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高影响因子
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