JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 5
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IF 1.768
Muhammad Remanul Islam,Mohammad Dalour Hossen Beg,Saidatul Shima Jamari
In this study, the contribution of multiwalled carbon nanotubes (MWCNTs) was studied for the evaluation of the performances of polyalkyd-based films produced from dehydrated palm oil. Initially, different percentages of MWCNTs, including 0.5, 1.0, and 1.5 wt %, were considered for loading into the resin with the help of sonication. Additionally, a 1.0 wt % loading was considered for in situ conditions during the esterification process to achieve better dispersion and obtain improved properties of the film. The loading was evaluated by different performance tests, such as those of tensile, elongation, pencil hardness, swelling ratio, gel content, wettability, chemical resistivity, adhesion, and surface morphology. The results of mechanical testing showed that the addition of 1.0 wt % MWCNTs enhanced the tensile strength by 50%, whereas in situ conditions were found to be favorable for significantly improving the tensile strength by 75%. Moreover, the wettability, surface morphology, and thermal properties were also found to be in favor of in situ conditions for the dispersion of the MWCNTs. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42934.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 30
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IF 1.768
Huiwen Zhao,Guofei Chen,Yu Zhou,Xing Li,Xingzhong Fang
A novel dianhydride, trans -1,2-bis(3,4-dicarboxyphenoxy)cyclohexane dianhydride (1,2-CHDPA), was prepared through aromatic nucleophilic substitution reaction of 4-nitrophthalonitrile with trans -cyclohexane-1,2-diol followed by hydrolysis and dehydration. A series of polyimides (PIs) were synthesized from one-step polycondensation of 1,2-CHDPA with several aromatic diamines, such as 2,2′-bis(trifluoromethyl)biphenyl-4,4′-diamine (TFDB), bis(4-amino-2-trifluoromethylphenyl)ether (TFODA), 4,4′-diaminodiphenyl ether (ODA), 1,4-bis(4-aminophenoxy)benzene (TPEQ), 4,4′-(1,3-phenylenedioxy)dianiline (TPER), 2,2′-bis[4-(3-aminodiphenoxy)phenyl]sulfone ( m -BAPS), and 2,2′-bis[4-(4-amino-2-trifluoromethylphenoxy)phenyl]sulfone (6F-BAPS). The glass transition temperatures ( T g s) of the polymers were higher than 198°C, and the 5% weight loss temperatures ( T d5% s) were in the range of 424–445°C in nitrogen and 415–430°C in air, respectively. All the PIs were endowed with high solubility in common organic solvents and could be cast into tough and flexible films, which exhibited good mechanical properties with tensile strengths of 76–105 MPa, elongations at break of 4.7–7.6%, and tensile moduli of 1.9–2.6 GPa. In particular, the PI films showed excellent optical transparency in the visible region with the cut-off wavelengths of 369–375 nm owing to the introduction of trans -1,2-cyclohexane moiety into the main chain. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42317.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 23
·
IF 1.768
Zhongfei Qi,Yong Yang,Zhu Xiong,Jun Deng,Ruoyu Zhang,Jin Zhu
A series of aliphatic diacyl adipic dihydrazides (ADHs) with different alkyl moieties were synthesized by the reaction between adipic dihydrazide and acyl chloride. Then these ADHs were solution blended with PLA respectively and were evaluated as nucleating agents. Through the investigation of nonisothermal and isothermal crystallization, it was found that both the crystallization rate and the crystallinity of PLA could be enhanced by adding only 1 wt % of ADHs. Especially for ADH-Oc (ADH-Octyl), the crystallization rate of PLA increased about 4 times at 105°C. Optical morphology showed that and the size of PLA spherulites decreased and the nucleation density increased with the existence of ADH-Oc. Meanwhile, the crystal structure of PLA were not discerniblly affected after the addition of ADHs as found by wide-angle X-ray diffraction. Thus, this study suggested these ADHs compounds are simple and potential nucleating agents to enhance crystallization ability of PLA. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42028.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 23
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IF 1.768
Huahong Zhuang,Yanhang Hong,Jingchen Gao,Siyuan Chen,Yina Ma,Shufang Wang
The purpose of this study was to develop a poly(γ-glutamic acid) (γ-PGA)-based hydrogel loaded with superoxide dismutase (SOD) to accelerate wound healing. First, γ-PGA was modified with taurine (γ-PGAS), and then the SOD-loaded γ-PGAS/γ-PGA hydrogel (SOD-PGAS/PGA-H) was prepared by cross-linking of ethylene glycol diglycidyl ether. The swelling behavior and water vapor transmission rate revealed that PGAS/PGA-H could create a moist environment for wound surface. In vitro kinetics of SOD release showed that SOD released from PGAS/PGA-H maintained high activity and SOD-PGAS/PGA-H effectively scavenged the superoxide anion. The results of our fibroblast proliferation experiments showed that PGAS/PGA-H had good cytocompatibility. The effects of SOD-PGAS/PGA-H on wound healing were examined in a Type I diabetic rat model with full-thickness wounds. Twenty-one days after grafted to wounds, SOD-PGAS/PGA-H exhibited a higher rate of wound healing than control group and showed increased collagen deposition and epithelialization. SOD-PGAS/PGA-H seems to promote better wound healing and thus might be a promising candidate for wound healing management. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42033.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 11
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IF 1.768
Tingting Li,Zhiming Zhang,Wei Li,Ce Liu,Haoyu Zhou,Libao An
Silicotungstic acid (H 4 SiW 12 O 40 )/poly(vinyl alcohol) (PVA)/poly(methyl methacrylate) (PMMA) composite nanofiber membranes were prepared by an electrospinning technique. A PMMA emulsion was mixed with PVA and H 4 SiW 12 O 40 evenly in water (electrospinning solvent). The configuration and elemental composition of the membranes were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The results indicate that H 4 SiW 12 O 40 with an intact Keggin structure existed in the composite membrane. The as-prepared H 4 SiW 12 O 40 /PVA/PMMA membranes exhibited enhanced photocatalytic efficiency (>84%) in the degradation of methyl orange (MO); it outperformed H 4 SiW 12 O 40 powder (4.6%) and the H 4 SiW 12 O 40 /PVA nanofiber membrane (75.2%) under UV irradiation. More importantly, the H 4 SiW 12 O 40 /PVA/PMMA membranes could be easily separated from the aqueous MO solution, and the photocatalytic efficiency of the membranes decreased inappreciably after three photocatalytic cycles. This may have been due to the enhanced water tolerance of the membranes and the stability of H 4 SiW 12 O 40 in the membranes. The photocatalytic process was driven by the reductive pathway with a much faster degradation rate because of the presence of PVA. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43193.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 3
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IF 1.768
Lei Zhang,Yingjie Cao,Lei Wang,Lu Shao,Yongping Bai
In the area of pressure sensitive adhesives (PSAs), corona treatment or other preprocessing on the carrier was commonly utilized for the enhancement of the interaction between the adhesive layer and the carrier, with complicated procedures and operations. To make it easy, one-pot emulsion polymerization using n-butyl acrylate, isobornyl methacrylate (IBOMA), 2-hydroxyethyl acrylate and acrylic acid was conducted in the presence of a reactive emulsifier SR-20 to obtain a reinforced adhesive tape. First, the emulsion had good stabilities, especially freeze-thaw stability, which was helpful to the fabrication of PSAs. Second, IBOMA increased the binding strength between adhesive layer and adherend. The properties of the final tapes well fulfilled the requirements of this areas, such as that the 180° peel strength of 125.9 N/m when coated on non-corona surfaces, the tack of 19 #, and the shear holding time of more than 100 h. Third, the tapes produced using the above emulsion could be removed many times, with no PSAs residue on the adherend even when coated on untreated PP, which showed the potential of recycling and environmental protection. Thus, these properties make the polyacrylate emulsion have great potential for practical applications. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42886.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 37
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IF 1.768
Hongqiu Wei,Fenghua Zhang,Dawei Zhang,Yanju Liu,Jinsong Leng
With aim of constructing a class of functional environmentally friendly materials, we electrospun chitosan (CS) blends with various contents of poly(ethylene oxide) (PEO) into a series of composite nanofibrous membranes exhibiting shape-memory behaviors. In the present composite system, CS and PEO served as hard and soft domains, respectively. The CS, presenting no thermal transition, and the PEO, with apparent melting–crystallization, were demonstrated by differential scanning calorimetry testing. Characterizations also revealed that the morphologies of the CS/PEO membranes were controlled by the mass ratios of CS/PEO. The composite fibrous membranes showed great mechanical performances and thermal stabilities as well. Moreover, CS/PEO possessed excellent shape-memory behaviors. Such fibrous membranes could complete their shape-recovery processes within 20 s at the temperature of 20°C above the melting transition temperature ( T m ). Both the shape fixity and shape-recovery ratios were higher than 90%, even after five cycles. The CS/PEO fibrous membranes present significant potential applications in the field of biotechnology and tissue engineering, such as in scaffolds and smart tubes. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42532.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 25
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IF 1.768
Zhengbin Tian,Lei Zong,Rujie Niu,Xiao Wang,Yan Li,Shiyun Ai
Conversion of lignin derived from lignocellulosic biomass to bio-oil has the promising potential to significantly reduce petroleum dependence. For that purpose, it is necessary to search for a low-cost lignin source. In this study, lignin sample was separated from straw pulping black liquor by HCl-precipitation, followed by extraction with a mixture of dioxane and water. The content of lignin in the total black liquor solid reached up to 34.8%, determined by UV spectroscopy, and the yield could account for 74.4% of the total lignin composition. The structure of lignin was investigated by various spectroscopic techniques such as FTIR, 1 H-NMR, XRD, and XPS. The structural analysis revealed that recovered lignin preserved basic lignin structure, but had relatively lower amount of β-O-4 linkages. The molecular weights were studied through THF-eluted GPC showing that separated lignin had the low M n , which was favorable for the full degradation process during conversion of lignin to bio-oil. Therefore, a feasible solution for effective utilization of lignin in straw pulping black liquor as feedstock for bio-oil was proposed in the study. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42057.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 23
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IF 1.768
Xiaomin Luo,Peng Zhang,Jing Ren,Rui Liu,Jianyan Feng,Binghui Ge
The long-chain functionalized graphene nanoplatelets (FGN) were functionalized by isophorone diisocyanate and then octadecylamine, the graphene functionalized/waterborne polyurethane (WPU) composites were prepared by solution mixture. The results showed that the FGN achieved good dispersion with exfoliated and intercalated nanostructure and strong interfacial adhesion with WPU, which made the nano–composites have a significant enhancement of thermal stability and mechanical properties at low FGN loadings. With 1.5% of FGN added, the tensile strength of the composites reached the maximum of 17 MPa, which improved by 41.6%, the water absorption of the composites is only 6.7%. With the incorporation of 2 wt % FGN, and the static contact angle of the composites reached to about 120°, showing the high hydrophobicity. At the same time, the volume resistivity of the composites was changed from 2.34 × 10 12 Ω·cm to 3.77 × 10 9 Ω·cm. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42005.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 24
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IF 1.768
Dandan Zhang,Hongbo Liang,Jiang Bu,Lei Xiong,Shengmei Huang,D. D. Zhang,H. B. Liang,J. Bu,L. Xiong,S. M. Huang
In this study, epoxidized soybean oil was modified to prepare acrylated epoxidized soybean oil (AESO) and vinyl/acrylate ended soybean oil (VASO), which were blended with mercaptopropyl polyhedral oligomericsilsequioxane (POSS-SH) to prepare UV curable thiol-acrylate and thiol-ene-acrylate hybrid coatings. Photopolymerization processes of the coatings were measured and the results showed that addition of POSS-SH obviously increased the conversion of double bond. The physical and mechanical properties of all cured samples were investigated, which indicated that the pencil hardness, tensile strength, and fracture toughness were significantly improved by POSS-SH. Moreover, with increasing POSS-SH content, the water contact angles of cured samples were increased, and the water resistance was greatly improved. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42095.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 132
·期 9
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IF 1.64
Haijiao Wang,Heyun Wang,Kai Chen,Yanmei Song,Zhong Wei,Mei Xue
A series of thermally stable lanthanum organic montmorillonites (La-OMMTs) were successfully prepared by modifying Na-MMT with anionic surfactants and lanthanum chloride. Fourier transform infrared spectroscopy and X-ray diffraction indicated that the anionic surfactants resided in the interlayer spaces and expanded the MMT basal spacing from 1.23 nm to 3.3 nm. Thermogravimetric and differential thermal analysis (TG/DTA) results showed that the intercalation of sodium dodecyl sulfonate into the lanthanum organic MMT resulted in its excellent thermal stability. The use of the La-OMMT samples in polyvinyl chloride (PVC) resins was tested, and the TG/DTG results revealed that the three La-OMMTs could significantly enhance the thermal stability of PVC. The modified La-OMMT with the highest thermal stability is expected to be useful in polymer/layered silicate nanocomposites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41535.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 132
·期 9
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IF 1.64
Yan-Yan Hu,Jing Zhang,Qi-Chen Fang,Dong-Mei Jiang,Chu-Cheng Lin,Yi Zeng,Ji-Sen Jiang
A novel semi-interpenetrating poly(2-hydroxyethyl methacrylate) (pHEMA) based polyelectrolyte hydrogel [p(HEMA- co -METAC)/PEG] was prepared by copolymerizing HEMA with the cationic monomer 2-methacryloyloxyethyltrimethyl ammonium chloride (METAC) in the presence of polyethylene glycol (PEG) with different content and molecular weight (MW 4000 and 400). The chemical structure of the gels was confirmed by FT-IR spectroscopy, morphology study was performed by scanning electron microscope (SEM), thermal stability was revealed by thermogravimetric analysis (TGA), and the mechanical properties were determined by electronic universal testing machine. Swelling studies showed introduction of cationic monomer METAC led to high water content, and the obvious salt and pH sensitive properties were observed which proved the smart behavior of the semi-interpenetrating polymer networks (IPNs) gels. In addition, the effect of temperature and some important biological solution on swelling behavior were reported. Cytotoxicity test demonstrated that synthesized gels owned satisfactory cytocompatibility and were convenient for the application as biomaterials. Finally, the weak bovine serum albumin (BSA) adsorption on semi-IPNs by introducing METAC and controlling the content of PEG in gels demonstrated that they were of good protein resistance effect in biomedical applications. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41537.
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