JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 134
·期 1
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IF 1.866
Di Liu,Guo-Min Wu,Zhen-Wu Kong
Waterborne polydimethylsiloxane-modified epoxy-resin-based polyol dispersions were synthesized by the reaction of 2,4-toluene diisocyanate with 2,2-bis(hydroxymethyl) propionic acid, hydroxypropyl-terminated polydimethylsiloxane (HTPDMS), and bisphenol A epoxy resin based polyol. These HTPDMS-modified polyol dispersions exhibited a small particle size and an excellent dispersion stability. Two-component waterborne polyurethane (2K-WPU) was prepared from the HTPDMS-modified polyol dispersion and a hydrophilic-modified polyisocyanate. The structure of the HTPDMS-modified polyol and its crosslinked 2K-WPU films (SEFs) were characterized with Fourier transform infrared and NMR spectroscopies. The effects of the HTPDMS content on the mechanical and thermal properties of the resulting SEFs were investigated. The results show that the thermal stability of the crosslinked SEFs was enhanced with increasing HTPDMS content, whereas the modulus, tensile strength, and pencil hardness values of the films decreased with increasing HTPDMS content. Siloxane segments migrated onto the surface during the film-formation process. The contact angle of the films increased from 71 to 96 °, and the water absorption ratio of the films decreased from 6.6 to 5.0% when the HTPDMS content in the films increased from 0 to 10%. These results indicate that the water resistance of the films was enhanced by the introduction of HTPDMS into the 2K-WPU networks. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44342.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 134
·期 1
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IF 1.866
Shaojie Liu,Huali Wang,Xiaomeng Chu
2,2,6,6-Tetramethylpiperidinyloxyl (TEMPO)-containing polymer brushes were grafted onto crosslinked polystyrene microspheres via surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) of 2,2,6,6-tetramethyl-4-piperidyl methacrylate, followed by an oxidation process with 3-chloroperoxybenzoic acid as oxidant. The synthesized nitroxide polymer brushes included homopolymer brushes, block copolymer brushes, and random copolymer brushes with various TEMPO contents and molecular weights. They were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography. These nitroxide brushes bearing high TEMPO contents were used as recoverable catalysts for the hypochlorite and aerobic oxidation of primary alcohols to aldehydes. The effects of polymer brush structure on the catalytic properties were studied and discussed. The results showed that these nitroxide polymer brushes had excellent catalytic properties and good recycling performances. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44365.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 48
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IF 1.866
Nan Cheng,Yu Wang,Feipeng Wu
A dual-responsive double-walled polymeric hollow sphere (PHS) serving as a candidate for synergetic drug delivery platform is prepared by a simple and green template polymerization in aqueous medium. The PHS, comprised of thermo-responsive crosslinked poly( N -isopropylacrylamide) (PNIPAM) as the inner shell and pH-responsive crosslinked poly(methacrylic acid) (PMAAc) as the outer shell, is assembled through self-removal of the thermo-responsive template from a core-triple shell structure by free radical polymerization with sequential addition of reactants. The discrete double-shell structure renders the PHS independent temperature and pH-controlled swelling/shrinking capability. Taking the advantage of two compartmentalized internal spaces (the core and the interlayer spaces) with independent temperature- and pH-dependent behaviors, two model drugs representing the small molecule and the macromolecule are loaded in selective locations of the PHS. Two drugs show dramatically different release profiles according to environmental temperature and pH, due to the localization of drugs and the stimuli-dependent property of its protective shells. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44335.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 47
·
IF 1.866
Yigang Wang,Xiaoan Nie,Xiaoying Li
A novel bio-based PVC plasticizer, levulinic acid pentaerythritol ketal ester (LAPKE), was synthesized and evaluated as renewable resource alternatives to traditional phthalate. The structure of LAPKE was characterized by FT-IR, 1 H NMR, and 13 C NMR. The LAPKE and dioctyl phthalate (DOP) at different mass ratio were added to the PVC to prepare PVC samples. The mechanical properties of PVC samples at mass ratio of 1:1 showed that its tensile strength, elongation at break was up to an optimum value. The thermal stability was measured by dynamic thermal stability and thermogravimetric analysis (TGA), and the results showed that the thermal ability of PVC was improved with the addition of LAPKE. The weight loss of migration property (volatility, leaching test and exudation) has also increased by increasing mass ratio of LAPKE. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44227.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 47
·
IF 1.866
Wan-Fen Pu,Yang Yang,Cheng-Dong Yuan
Polymer gels have been widely used for water shutoff in mature oil fields. In this paper, polyacrylamide (PAM)–montmorillonite (MMT) nanocomposites (NC) were prepared through in situ intercalative polymerization. Fourier transform infrared spectroscopy and X-ray diffraction were conducted to characterize the prepared PAM/MMT nanocomposites. The gelation performance of poly(ethylene imine) (PEI) crosslinking PAM/MMT nanocomposite gel system (NC/PEI gel system) was systematically investigated by bottle testing and viscosity measurement methods. The results showed that the gelation performance of the NC/PEI gel system was greatly affected by the total dissolved solids, PAM/MMT nanocomposite concentration, and PEI concentration. The NC/PEI gel system exhibited much better thermal stability and gelation performance than the PAM/PEI gel system at the same conditions. The gelation performance after flowing through porous media of the NC/PEI gel system before injection and that of the subsequently injected gel system was different. The gel strength decreased and the gelation time was delayed after the gel system before injection was flowed through porous media. However, the gel strength of the subsequently injected gel system did not decrease, and only the gelation time was delayed after flowing through porous media. This study suggests that the NC/PEI gel system can be used as a potential water-shutoff agent in high-temperature reservoirs. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44243.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 135
·期 7
·45866
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IF 1.86
Chunda Ji,Fengfu Li,Zhi Yun
A series of phenyl carboxyl polydimethylsiloxane (PCPDMS) with different relative molecular mass, phenyl and carboxyl content was prepared through condensation reaction and equilibrium polymerization. The effects of reaction conditions on the conversion were investigated, to determine the optimum reaction conditions. According to the thermal gravity analysis of PCPDMS with different relative molecular mass and phenyl content, it was found that the large relative molecular mass can improve the thermal stability of PCPDMS. The thermal stability of PCPDMS was significantly higher than carboxyl polydimethylsiloxane. Moreover, the PCPDMS emulsions were also prepared for the fabrics treatment. The emulsions can improve the wrinkle resistance, smoothness, elasticity, and other properties of the fabrics. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45866.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 43
·45444
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IF 1.86
Fuchen Zhang,Qiuxia Wang,Lipeng Wang,Yongping Bai
This article describes the implementation of plant-derived isosorbide (IS) and isomannide (IM) in the copolymerization modification of poly(ethylene terephthalate). The effects of the two comonomers on the optical, crystallization, and thermal properties of the resulting copolyesters were studied using the following analytical methods: proton nuclear magnetic resonance; differential scanning calorimetry; X-ray diffraction; thermogravimetry; and ultraviolet-visible spectroscopy. As comonomers, IS and IM increased the transmittance and reduced the haze of the copolyesters. Moreover, while IM improved the optical properties more than did IS, both monomers improved the optical properties of the copolyesters by lowering its crystallization ability. After the copolymerization modification, the crystallization rate of the copolyesters was reduced, decreasing the crystallinity and crystal size and thereby reducing the light transmission interference. The comonomers also altered the light absorption properties of the copolyesters and conferred a substantial increase in the transmittance of near-infrared (NIR) wavelengths. These changes in optical properties exhibit the potential of these comonomers for applications in optical materials and NIR detectors. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45444.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 30
·45133
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IF 1.86
Xinzhen Zhao,Changkun Liu
A novel thin film composite-type forward osmosis (FO) membrane with inhibited concentration polarization phenomenon and expectant separation performance was prepared by continuous interfacial polymerization method. The nylon-6,6 microfiltration membrane with the average pore size of 5 μm and the self-wetting property was for the first time used as the supporting layer of the FO membranes, which decreased the mass transfer resistance in the porous supporting layer. The skin layer was prepared via the continuous interfacial polymerization of polyamide as a relatively dense layer, with the reverse salt flux of less than 1 g/m −2 h −1 . The mass transfer resistance and the reverse salt flux of the prepared FO membranes were remarkably reduced due to the functional design of the double-layer structure, which effectively enhanced the separation selectivity and restrain the concentration polarization of the FO membranes. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45133.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 31
·45144
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IF 1.86
Hongqiang Li,Yong Zhong,Wenjian Wu,Lin Zhang,Xuejun Lai,Xingrong Zeng
C-methylcalix[4]resorcinarene (CMCR) was first synthesized by condensation reaction between resorcinol and acetaldehyde, and then used as functional monomer to prepare two CMCR derivatives including CMCR-1 and CMCR-2 with four ethoxymethyl chains and four hexylthiolmethyl chains, respectively. The structures of CMCR and its derivatives were confirmed by Fourier transform infrared spectroscopy and high-resolution mass spectrometry. Thermogravimetric analysis revealed CMCR, CMCR-1, and CMCR-2 had superior thermal stability than commercial antioxidant 2,6-di- tert -butyl-4-methylphenol. Oxidation induction time and accelerated thermal aging tests indicated that CMCR-2 exhibited excellent antioxidative property in natural rubber, which was due to multiphenol groups, big steric hindrance, and synergistic effect between thiother and hindered phenol. Importantly, CMCR-2 also possessed outstanding extraction resistance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45144.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 134
·期 8
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IF 1.866
Xiaobing Hu
In this thesis, two novel porous hyperbranched poly(1,3,5-tris(4-carboxyphenyl) benzene p -phenylenediamine) amides with different terminal functional groups are synthesized through an A 2 + B 3 approach using 1,3,5-tri(4-carboxyl phenyl) benzene (H 3 BTB) and p -phenylenediamine as raw material, N -methyl-pyrrolidone as solvent, triphenyl phosphite and pyridine as dehydrating agent, by means of regulating the mole ratio of the monomers. The chemical structures of the prepared hyperbranched polymers are characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance ( 1 H-NMR and 13 C-NMR) analysis. These two polymers can be soluble in dimethyl sulfoxide (DMSO) and N , N -dimethyl formamide (DMF). Their DMSO solutions exhibit strong blue fluorescence, especially for the amino terminated polymer HP-NH 2 . While in DMF solution, the two polymers emit strong green fluorescence. These two polymers are porous polymers with the Brunauer−Emmett−Teller surface areas of 4.53 and 24.52 m 2 /g for HP-COOH and HP-NH 2 , respectively. They are potential useful in the areas of storage, separation, catalysis, and light emitting. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44505.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 134
·期 7
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IF 1.866
Mengyu Zhan,Siyu Li,Yi Zhong,Chunhui Shen,Shanjun Gao
Multistage emulsion polymerization was used to prepare ultra-high molecular weight foam regulator of low cost, with methyl methacrylate (MMA), butyl acrylate (BA), styrene (St) as main raw materials. Ubbelohde viscometer, dynamic light scattering, infrared and raman spectra, TEM, DSC, TGA, and GPC were all used to characterize constituent and structure, morphology, and molecular weight. As a result, when the ratio of soft monomer (BA) and hard monomer (St + MMA) is 1:3, MMA:St = 4:1, potassium persulfate (KPS): 0.15%, sodium hydrogen sulfite (SHS): 0.05%, azodiisobutyronitrile (AIBN): 0.15%, divinyl benzene (DVB): 0.3%, the final product terpolymer has obvious core-shell structure and ultra-high molecular weight ( M w = 1,400,000). This kind of foam regulator showed improvements in the melt strength, prevention of bubble coalescence and reduction on cost when compared with the traditional. Finally, the coefficients of poly (methyl methacrylate-butyl acrylate-styrene) terpolymer's Mark-Houwink equation were calculated with tetrahydrofuran (THF) solvent at 25 °C. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44479.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 134
·期 8
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IF 1.866
Jianquan Tan,Weiqu Liu,Zhengfang Wang
Novel waterborne UV-curable polyurethane containing long fluorinated side chains (WUVFPU) was prepared and the fluorinated component was incorporated by two novel fluorinated macromolecular diols (FDO) with different chain length as chain extender. FDO was synthesized via free radical polymerization of hexafluorobutyl methacrylate (HFBMA) using 1-thioglycerol (TG) as chain transfer agent. Extremely low dosage of FDO incorporated could change the surface property significantly. The influence of both the content and chain length of FDO on the surface energy, surface composition and morphology were investigated by contact angle measurement, XPS and AFM. Surface energy significantly decreased at extremely low concentration of FDO. The hydrophobicity was enhanced with increasing both the content and the chain length of FDO. XPS and AFM results revealed the enhancing hydrophobicity was attributed to the enrichment of F atoms and rougher surface morphology. Gel content, pencil hardness, adhesion, and optical transmittance tests were employed to investigate the coating properties of the UV-cured films. The preparation and investigation of WUVFPU might provide better understanding of the influence of fluorinated chain length on the properties of polyurethane for theory. Moreover, it might provide a facile and effective route to prepare polyurethane materials with low surface energy for engineering and industry. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44506.
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高影响因子
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