JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 39
·
IF 1.866
Lili Yu,Ning Ren,Kuan Yang,Miao Zhang,Li Su
A novel dual-responsive (light and pH) particle based on poly(methacrylic acid), poly(methacrylic acid)–poly[1-(2-nitrophenyl)ethane-1,2-diyl bis(2-methylacrylate)]was prepared with the facile method of two-step homogeneous radical polymerization with methacrylic acid as the monomer and 1-(2-nitrophenyl)ethane-1,2-diyl bis(2-methylacrylate) as a photodegradable crosslinker. Photolytic assessments were conducted upon irradiation with a UV lamp; this led to particle disintegration caused by cleavage of the photolabile crosslinking points. The light-dependent degradation was investigated through particle size changes, absorption spectra variations, surface morphology changes, Fourier transform infrared spectroscopy, and the release of Nile red from the particles after irradiation. The pH dependence of the particle systems induced by the protonation and deprotonation of poly(methacrylic acid) was also confirmed by fluorescence spectroscopy. The triggered release of fluorescein diacetate was investigated to demonstrate that the release behavior in cells was light dependent. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44003.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 39
·
IF 1.866
Yu Zhao,Nana Li,Fangzhu Yuan,Haiding Zhang,Shengji Xia
Zn–Al layered double hydroxide (LDH)-entrapped poly(ether sulfone) (PES) ultrafiltration membranes with four different weight percentages, 0.5, 1.0, 2.0, and 3.0%, were prepared by a phase-inversion method. Characterization by scanning electron microscopy, atomic force microscopy and contact angle (CA), equilibrium water content, porosity, average pore size, mechanical strength, and ζ potential measurement were used to evaluate the morphological structure and physical and chemical properties of membranes. Static protein adsorption, filtration, and rejection experiments were conducted to study the antifouling properties, water permeability, and removal ability of the modified membranes. The results show that significant change occurred in the membrane morphology and that better hydrophilicity, water permeability, and antifouling ability were also achieved for the PES/LDH membranes when a proper amount of LDH was used. For example, the CA value decreased from 66.60 to 50.21°, and the pure water flux increased from 80.21 to 119.10 L m −2 h −1 bar −1 when the LDH loading was increased from 0 to 2.0 wt %. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43988.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 37
·
IF 1.866
Peng Wang,Fusheng Yang,Liang Li,Zaisheng Cai
Two phosphorus-containing phenolic amines, a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based derivative (DAP) by covalently bonding DOPO and imine (SB) obtained from the condensation of p -phenylenediamine with salicylaldehyde, and its analog (AP) via the addition reaction between diethyl phosphite and SB, were used to prepare flame-retardant epoxy resins. The burning behaviors and dynamic mechanical properties of epoxy thermosets were studied by limited oxygen index (LOI) measurement, UL-94 test, and dynamic mechanical analysis. The flame-retardant mechanisms of modified thermosets were investigated by thermogravimetric analysis, Py-GC/MS, Fourier transform infrared, SEM, elemental analysis, and laser Raman spectroscopy. The results revealed that epoxy thermoset modified with DAP displayed the blowing-out effect during UL-94 test. With the incorporation of 10 wt % DAP, the modified thermoset showed an LOI value of 36.1% and V-0 rating in UL-94 test. The flame-retardant mechanism was ascribed to the quenching and diluting effect in the gas phase and the formation of phosphorus-rich char layers in the condensed phase. However, the thermoset modified with 10 wt % AP only showed an LOI value of 25.7% and no rating in UL-94 test, which was possibly ascribed to the mismatching of charring process with gas emission process during combustion. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43953.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 38
·
IF 1.866
Shuyi Wang,Xiaohui Tian,Jinyu Sun,Jin Liu,Junchao Duan
Na-montmorillonite/polyethyleneimine- g -poly(methyl methacrylate) (Na-MMT/PEI- g -PMMA) nanocomposite latexes were prepared by soap-free emulsion polymerization in the aqueous suspension of Na-MMT. The exfoliated morphology of the nanocomposites was confirmed by XRD and TEM. With the aim of improving morphology and mechanical properties of natural rubber latex (NRL) films, the synthesized Na-MMT/PEI- g -PMMA nanocomposites were mixed with NRL by latex compounding technology. The results of SEM and AFM analysis showed that the surface of NRL/Na-MMT/PEI- g -PMMA film was smoother and denser than that of pristine NRL film while Na-MMT was dispersed uniformly on the fracture surface of the modified films, which suggested the good compatibility between NRL and Na-MMT/PEI- g -PMMA. The tensile strength of NRL/Na-MMT/PEI- g -PMMA films was increased greatly by 85% with 10 phr Na-MMT/PEI- g -PMMA when Na-MMT content was 3 wt % and the elongation at break also increased from 930% to 1073% at the same time. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43961.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 38
·
IF 1.866
Xinghua Guan,Fang Chen,Zhiguang Li,Hualong Zhou,Xiaoyan Ma
Diblock copolymers poly(methyl methacrylate)- block -polystyrene with three different molar ratios [poly(methyl methacrylate)/polystyrene (PS) = 1:1, 1:1.5, and 1:1.8] were synthesized by atom transfer radical polymerization and used as a polymer matrix for gel polymer electrolytes (GPEs). The positron annihilation lifetime spectroscopy was applied to determine the free-volume behaviors of different GPEs, respectively. We illustrated that a proper PS ratio may led to the formation of a high fraction of free volume, and the influence of the PS ratio on the free-volume fraction was caused by the different morphologies of the GPEs because of the different packing densities of the PS rigid block. The ionic conductivity was correlated with the free volume in the GPE through the study of the ionic conductivity dependence on the temperature; this followed the Vogel–Tamman–Fulcher equation. Moreover, an ionic conductive model was proposed, in which variations of the free-volume behavior provide different ionic-conducting abilities. Thermogravimetric analysis indicated that GPEs based on different block copolymers exhibited high liquid-electrolyte preservation properties. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43901.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 37
·
IF 1.866
Yan Wu,Zongliang Du,Haibo Wang,Xu Cheng
To construct waterborne polyurethane with excellent water resistance and mechanical properties, an organic-inorganic hybrid nanocomposite based on modified halloysite nanotubes (mHNTs) and polyurethane was prepared. The HNTs were modified with an amino-silane coupling agent (KH550) and then reacted with polypropylene glycol, 2,2-Dimethylol propionic acid, and Toluene diisocyanate to form mHNTs/PU aqueous dispersions. The structure of the siloxane functionalized mHNTs was confirmed by a Fourier transform infrared study. The PU/mHNTs composites were characterized by using differential scanning calorimetry, scanning electronic microscopy, thermal gravimetric analysis, a tensile test, particle size analysis, and a water swelling experiment. The tensile strength, Young's modulus, and elongation at the break of the composite polymer with 0.5 wt % mHNTs was shown to be significantly improved, by approximately 200%, 200%, and 30%, respectively. An excess amount of mHNTs could weaken the reinforcing effect and stability of the composite emulsion. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43949.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 35
·
IF 1.866
Jin Liu,Xiaohui Tian,Jinyu Sun,Yizhong Yuan
Poly(methyl methacrylate- co -butyl methacrylate) [P(MMA- co -BMA)] nanoparticles were synthesized via emulsion polymerization, and incorporated into natural rubber (NR) by latex compounding. Monodispersed, core-shell P(MMA- co -BMA)/casein nanoparticles (abbreviated as PMBMA-CA) were produced with casein (CA) as surfactant. The chemical structure of P(MMA- co -BMA) copolymers were confirmed by 1 H-NMR and FTIR analyses. Transmission electron microscopy demonstrated the core–shell structure of PMBMA-CA, and PMBMA-CA homogenously distributed around NR particles, indicating the interaction between PMBMA-CA and NR. As a result, the tensile strength and modulus of NR/PMBMA-CA films were significantly enhanced. The tensile strength was increased by 100% with 10% copolymer addition, when the molar ratio of MMA:BMA was 8:2. In addition, scanning electron microscopy and atomic force microscopy results presented that the NR/PMBMA-CA films exhibited smooth surfaces with low roughness, and PMBMA-CA was compatible with NR. FTIR-ATR analyses also suggested fewer PMBMA-CA nanoparticles migrated out of NR. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43843.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 36
·
IF 1.866
Jiangquan Liu,Xiaoguang Ying,Hongxun Wang,Xiao Li,Weiying Zhang
Polyethylene glycol grafted calcium alginate hydrogel microspheres are synthesized by ring-opening and addition reaction of epoxy chloropropane. FTIR, 13 C NMR, optical microscope, SEM, TG, and DSC are used for characterization. Swelling behaviors are studied and it is found that polyethylene glycol grafted calcium alginate microspheres are improved in anti-swelling properties. Protein-imprinted polyethylene glycol grafted calcium alginate hydrogel microspheres exhibit enhanced specific rebinding quantity (11.16 mg/g) and selective recognition properties (4.71 against BHb), towards target molecule in the presence of competing protein, compared with that of the unmodified samples (4.96 mg/g and 1.75, respectively). © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43617.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 20
·
IF 1.866
Caihong Wang,Hao Wu,Fangshu Qu,Heng Liang,Xiaojun Niu,Guibai Li
To investigate the influence of magnetic materials combined with carbon nanotubes (CNTs) as fillers on the membrane properties, multi-walled carbon nanotubes (MWCNTs) functionalized by mixed acids (V H2SO4 :V HNO3 =3:1) were loaded by Fe 3 O 4 through a hydrothermal method. The obtained MWCNTs/Fe 3 O 4 hybrids were characterized by X-ray diffraction (XRD), Infrared spectroscopy (IR) spectrum, and scanning electron microscope (SEM) and then blended with polyvinyl chloride (PVC) to prepare ultrafiltration (UF) membranes through a phase inversion process. Simultaneously, two other UF membranes, PVC blended with acid-treated MWCNTs and PVC blended with nothing, were also prepared. The results showed that the membrane porosity and mean pore size increased slightly with the addition of fillers. Static contact angle showed that MWCNTs/Fe 3 O 4 hybrids improved the hydrophilicity of membrane surface better than the acid-treated MWCNTs. Pure water flux increased consistently with the hydrophilicity of the membrane surface. SEM and atomic force microscope (AFM) images showed that the MWCNTs/Fe 3 O 4 blended membrane formed a relatively complete pore structure throughout the cross-section and had a rougher top surface. However, the mechanical properties of membranes with fillers were reduced compared with the pristine PVC membrane. The rejections of membranes for Bovine serum albumin (BSA), Bisphenol A (BPA), and Norfloxacin (NOR) showed that MWCNTs/Fe 3 O 4 played an important role in trapping pollutants in membrane filtration. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43417.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 19
·
IF 1.866
Honggang Mei,Guowen Chen,Qingzeng Zhu,Peng Dong,Dannan Zhao,Waqas Ahmed Raza
Two types of vinyl silicone oil (VSO), allyl-capped hyperbranched polycarbosilane (HBP), and triethoxysilane (TES) were employed to synthesize macromolecular silane coupling agent (MMSCA) by hydrosilylation. VSOs, HBP, and the hydrosilylated products were used as crosslinker, respectively, to improve weak mechanical properties of silicone rubber (SR). Structures of the crosslinkers were studied by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), and nuclear magnetic resonance (NMR). Crosslinking density test and scanning electron microscope (SEM) observation showed an increased interaction between silicone rubber and fumed silica by the use of MMSCA. Mechanical properties of the resulted composites using MMSCAs were increased to varying degrees compared with those possessing crosslinkers without ethoxy group. MMSCAs were effective for further property enhancements of composites. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43415.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 19
·
IF 1.866
Wanpeng Ma,Wei Zhang,Yang Zhao,Sijie Wang
Information on the mechanical properties of microcapsules is essential to understanding their performance during manufacturing, processing, and applications. The mechanical properties of urea–formaldehyde (UF) microcapsules filled with ethyl phenyl acetate (EPA) were determined by applying single-microcapsule compression and a finite element model. Microcapsules were prepared by in situ polymerization, and the average wall thickness of microcapsules was 192 ± 12 nm as determined using scanning electron microscopy. The deformation behavior of the microcapsule was measured by a single-microcapsule compression experiment between two parallel plates. The results show that both burst deformation and burst force were linearly related to microcapsule size. A model for an elastic shell filled with incompressible fluid was used to simulate compression of the microcapsule in ABAQUS. Dimensionless parameters were introduced to the model. The relationship between dimensionless force and dimensionless displacement depended on the ratio of wall thickness to diameter (ε). However, the relationship remained the same when ε was less than 1% and can be fitted well by the mathematical equation. An estimation of Young's modulus can be obtained from the compression data for the dimensionless deformation from 10% to 15%. The average Young's modulus of a UF/EPA microcapsule is estimated to be 2.12 ± 0.45 GPa. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43414.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 18
·
IF 1.866
Fangyuan Guo,Wei Zhang,Xiaohong Pei,Xia Shen,Qinying Yan,Weiyong Hong,Gensheng Yang
With the growing number of therapeutic proteins on the market, effective delivery systems are receiving particular attention. In this study, biodegradable elastomers, intended for protein drug delivery and based on methacrylic tripoly(ε-caprolactone- co - d , l -lactide) cyclic ester with different ratios of ɛ-caprolactone to d , l -lactide and methacrylic bipoly[ɛ-caprolactone- b -poly(ethylene glycol)- b -ɛ-caprolactone], were synthesized and characterized. The degradation behavior, bovine serum albumin (BSA)-releasing kinetics, and cytotoxicity of the elastomers in vitro were investigated. The elastomers were degraded by the hydrolysis of the ester bond; this resulted in pH changes, which further affected the degradation rate. The BSA-releasing behavior was strongly dependent on the diffusion mechanism. In the diffusion-controlled period, nearly sustained and stable BSA release was achieved. Furthermore, the elastomers displayed good biocompatibility, as demonstrated by a 3-(4,5-dimethyl thiazol-2-yl)−2,5-diphenyl tetrazolium bromide assay and inflammation–induction experiments, and are considered promising candidates for the controllable delivery of protein drugs. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43393.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）