JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 9
·47143
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IF 1.901
Xuping Yang,Yuxing Shan,Xiaonan Wei,Shengyuan Zhong,Yawen Huang,Hongtao Yu,Junxiao Yang
Reinforcement of materials with low dielectric constant by nanofillers has attained more and more attention. Conventional 1D nanofillers, such as carbon nanotubes, significantly enhance mechanical properties of polymers; however, they do not reduce dielectric constant. In this study, silica nanorods (SNR) were used to prepare polyethylene composites by mechanical blending followed by hot pressing. It was found that the incorporation of SNRs enables enhancement of strength and elastic modulus. Dielectric constant did not increase as predicted when SNRs were incorporated into polyethylene (PE); on contrary, it considerably decreased from ~2.4 to around ~2.2 at SNR loading of 5 wt %. However, when glass fibers were used as fillers, we did not observe such decrease. SEM image and density measurement indicated that the composites were compact with very low porosity. We believe that the incorporation of SNRs alters crystalline and chain arrangement of PE, thus reduces the polarization and dielectric constant. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47143.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 11
·47187
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IF 1.901
Jing Wang,Hongqiang Li,Lin Zhang,Xuejun Lai,Wenjian Wu,Xingrong Zeng
Reduced graphene oxide reinforced acrylic rubber (ACM/RGO) was in situ prepared via self-assembly method in the presence of hydrazine hydrate as reducing agent. X-ray diffraction and X-ray photoelectron spectroscopy confirmed the chemical structure of ACM/RGO, and transmission electron microscope and scanning electron microscope demonstrated that RGO was uniformly dispersed in ACM matrix. Due to the barrier role of RGO sheets, the resistances to heat and water of ACM/RGO were obviously improved. Furthermore, the mechanical properties were also largely affected by the incorporation of RGO. With 2 parts per hundred rubber of RGO, the tensile strength and Shore A hardness of ACM/RGO reached 18.8 MPa and 73, and the elongation at break maintained at 236%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47187.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 47
·46837
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IF 1.901
Junji Wei,Xiaojuan Meng,Xinyue Chen,Yafei Bai,Jiale Song,Ni Yan,Lei Zhu,Aiqin Shen
A new class of specialty polymer, fluorinated poly(arylene ether nitrile) (PAEN-F), was synthesized via the aromatic nucleophilic substitution reaction. Due to its rigid structure, PAEN-F exhibited enhanced heat resistance and thermal stability. Consequently, the glass-transition temperature and initial degradation temperature of PAEN-F reached as high as 179°C and 554°C, respectively. PAEN-F also showed excellent solubility in low-boiling solvents owing to fluorine groups and the nonplanar structure in the repeat unit. Due to its strong 6F dipoles, PAEN-F exhibited a high dielectric constant (ɛ r ) of 3.6, a high electrical breakdown strength of 346 MV/m, and a reasonably low dissipation factor (tan δ) of 0.014 at 25°C and 100 Hz. Therefore, this dipolar glass polymer is promising for high-temperature and low-loss electric energy storage applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46837.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 2
·46929
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IF 1.901
Yang Xue,Xiaofei Li,Haosheng Wang,Donghai Zhang,Yunfa Chen
In this study, we constructed hybrid three-dimensional (3D) filler networks by simply incorporating a relatively low content of one-dimensional carbon nanotubes (CNTs; 0.0005–0.25 vol %) and a certain content of two-dimensional boron nitride (BN; 30 phr) in a silicone rubber (SIR) matrix. As indicated by transmission electron microscopy observation, flexible CNTs can serve as bridges to connect BN platelets in different layers to form hybrid 3D thermally conductive networks; this results in an increase in thermally conductive pathways, and the isolation between CNTs can prevent the formation of electrically conductive networks. Compared to the SIR–BN composite with the same BN content, the SIR–BN–CNT composites exhibited improved thermal conductivity, slightly increased volume resistivity, and comparable breakdown strength without a largely decreased flexibility. When 0.25 vol % CNTs were incorporated, the SIR–BN–CNT composite exhibited 75 and 25% higher thermal conductivities relative to the neat SIR and SIR–BN composite with 30 phr BN, respectively, and a thermal conductivity that was even comparable to SIR–BN composite with 40 phr BN. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46929.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 6
·47054
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IF 1.901
Changzeng Yan,Tianhang Yu,Chao Ji,Xiaoliang Zeng,Jibao Lu,Rong Sun,Ching-Ping Wong
Heat removal via thermal management materials is attracting more and more attention in the electronic industry. Conventional particle/polymer thermal conductive composites require a high filler loading ratio (>30 vol %), which cause severe thermal interfacial resistance and mechanical issue. In this work, we fabricate tellurium nanowires (NWs)/epoxy nanocomposites via a facile bar coating method. According to Agari model and Maxwell–Eucken model, the as-synthesized ultra-long NWs with high aspect ratio (>100) construct the 3D interconnected thermal conductive network better in resin matrix to facilitate the heat transfer process. The results show that at a low loading ratio of 2.4 vol %, this nanocomposite exhibits the out-of-plane and in-plane thermal conductivity of 0.378 and 1.63 W m −1 K −1 , respectively, which is 189 and 715% higher than that of pure epoxy resin. Importantly, good stability, and flexibility of nanocomposites are well maintained. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47054.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 8
·47100
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IF 1.901
D. Hu,L. Yan,T. Liu,Z. Xu,L. Zhao
In CO 2 -assisted polyurethane (PU) foaming, the solubility and diffusion coefficient of CO 2 is vitally important to the cell nucleation and growth. This work is aimed at the effect of molecular weights ( M n ) and crosslinking densities ( V e ) on the solubility and diffusion coefficient of CO 2 in PU oligomers. A series of PU oligomers with different M n and V e were synthesized. The solubility and diffusivity of CO 2 in PU oligomers were measured experimentally in the temperature from 80 to 140 °C and with pressures up to 15 MPa. It was shown that the solubility and diffusion coefficients of CO 2 was decreased 20.5 and 21.0%, respectively, with the M n increasing from 5864 to 153,754 g mol −1 at 80 °C, 15 MPa. The solubility and the diffusion coefficient also decreased 11.1 and 38.0% as the V e was increased from 64 to 1493 mol m −3 . Furthermore, the diffusion mechanism of CO 2 in PU oligomers was explored via molecular dynamics simulations. The results indicated that the calculated diffusivity of CO 2 showed the same changing trend as the experimental values, and the smaller M n or crosslinking degree contributed to an increase in fractional free volume and stronger polymer–CO 2 interactions. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47100.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 40
·e46834
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IF 1.901
Jiguang Liu,Gaoli Shi,Yue Liu,Siyan Chen,Cong Shang
A novel method is presented for the construction of a hierarchical microstructure/nanostructure via the chemical self-assembly of poly( N -isopropyl acrylamide- co -acrylic acid) particles on polyester fibers. The textile of the particle-bound fibers possessed smart wettability and an oil-absorbing capacity. The wettability was dependent on the initial contact angle and spreading time of water droplets on the particle-bound textile, which could be controlled with the content of acrylic acid inserted into the polymer chains. The wettability of the particle-bound textile was responsive to the pH value. In addition, the textile was superoleophilic on an air–solid surface and could absorb oil quickly from water. The oil-absorbing capacity could be controlled by the alteration of the pH value. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46834.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 38
·46694
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IF 1.901
Fuxin Dong,Yue Li,Xiaohua Yuan,Ping Wang,Junjie Yang,Lei Miao
A highly transparent thermoresponsive surface that could switch its wettability at different temperatures was constructed via tea-stain-inspired chemistry. The pristine tannic acid was modified by alkyl bromide with a substitution degree of 1.7 alkyl bromide units per tannic acid molecule. A coating of the alkyl bromine modified tannic acid with a thickness of 22 ± 3 nm was deposited onto the surface of glass via auto-oxidation. A poly( N -isopropylacrylamide) (PNIPAAm) brush was grafted from the alkyl bromide initiator via surface initiation atom transfer radical polymerization with a polymer grafting density of 8.6 × 10 −3 mg/cm 2 . Due to the low thickness of the tannic acid and PNIPAAm coating, the transparency of this thermoresponsive surface remained constant at 94.3% even when the temperature was changed from 20 to 40 °C, but the water contact angle of this surface increased rapidly when the temperature was elevated from 25 to 35 °C. Due to the inevitable hydrolysis and deprotonation, this tea-stain-inspired chemistry-based coating was stable in aqueous solution with a pH of 7 or isopropanol for soaking times of up to 24 h. The coating reported here may have various potential applications such as surfaces for cell culture media, food storage, or self-cleaning materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46694.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 32
·46612
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IF 1.901
Jian Zhang,Jing-Wen Wang,Ren-Kui Ge
In order to improve the adhesion strength of acrylic adhesive to untreated poly(ethylene terephthalate) (PET) substrate, two-component acrylic structural adhesives initiated by tributylborane were prepared. The effects of acrylic monomers, elastomers, decomplexers, and oligomers on the adhesion properties of two-component acrylic structural adhesive were investigated in sequence. It is found that the shear strength on PET of adhesives toughened by acrylonitrile–butadiene–styrene copolymer and carboxyl-terminated butadiene–acrylonitrile copolymer is higher than that of commercial adhesives Dp8010NS and Loctite 3030. A tailored oligomer was synthesized from hydroxyl propyl–terminated polydimethylsiloxane and 3-isopropenyl-α,α-dimethylbenzyl isocyanate. It is also noticed that premature failure usually takes place in the lap shear test samples due to the brittleness of the acrylic adhesive, except in the sample of adhesive modified by tailored oligomer. Excellent adhesion to the PET substrate is achieved by this adhesive modified by tailored oligomer, with a lap shear strength above 11 MPa and T-peel strength up to 5.34 N/mm. Additionally, the resulting adhesive is qualified for the structural bonding of PET materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46612.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 33
·46624
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IF 1.901
Yong Chen,Qingkun He,Guoyuan Ren,Chunyan Feng,Na Li,Hao Yu,Qiuxia Han
A cyclic N -halamine precursor, 4-ethyl-4-(hydroxymethyl)oxazolidin-2-one (EHMO), was synthesized and attached to poly(methylhydrosiloxane) (PMHS) through silane alcoholysis between the O H of EHMO and Si H of PMHS. The alcoholysis product was chlorinated with tert -butyl hypochlorite to transfer the N H to N Cl and obtain an EHMO-based N -halamine polysiloxane. The N -halamine polysiloxane was impregnated into inert polypropylene (PP) fibers and formed a 72 nm coating layer using supercritical carbon dioxide (scCO 2 ) as solvent and swelling reagent at 28 MPa and 50 °C for biocidal application. The overall synthetic procedure and the impregnation process were characterized by FTIR, XPS, and SEM, respectively. The N-halamine polysiloxane layer on PP imparted potent antibacterial abilities against both Staphylococcus aureus and Escherichia coli while pristine ones did not exhibit noticeable killing activities. Stability tests showed that the N -halamine polysiloxane layer was resistant to washing cycles, storage, and UV irradiation and the rechlorination of lost chlorines was good. The strategy of using CO 2 -philic PMHS as carrier polymer and scCO 2 as working solvent for impregnation presents a general and friendly procedure to functionalize inert substrates without the need of chemical linkage and organic solvent. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46624.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 32
·46583
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IF 1.901
Ying Pan,Hongting Zhao
Sulfonated melamine-formaldehyde (SMF) resin was successfully synthesized with a mixture of formaldehyde, melamine, and NaHSO 3 in an aqueous solution. Then the SMF was used as the blowing agent to combine with chitosan and phytic acid for fabricating the intumescent flame retardant coating on the surface of the cotton fabric by layer-by-layer (LbL) self-assembled technology. As characterized by X-ray photoelectron spectroscopy, scanning electron microscopy, and attenuated total reflection Fourier transform infrared spectroscopy, the (chitosan/SMF + phytic acid) n coating was successfully deposited on the surfaces of cotton fibers. Thermogravimetric analysis results exhibited that the thermal stabilities of coated cotton fabrics under nitrogen and air atmosphere were enhanced at temperatures ranging from 400 to 700 °C compared with pure cotton fabric. At 700 °C, the char residues of cotton-5BL and cotton-10BL under a nitrogen atmosphere were improved 25.9 and 32 wt % than that of pure cotton fabric, respectively. In the vertical flame test, the self-extinguishing could be obtained for the cotton-10BL sample. This work first utilized SMF as negative polyelectrolyte to fabricate intumescent flame retardant coating by LbL self-assembled technology on cotton fabric to strengthen its thermal stability and flame resistance. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46583.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 31
·46593
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IF 1.901
Li Yang,Ting Wang
Cyclodextrin-grafted cellulosic hydrogel beads (CD + @HEC-CMC-gel) were prepared through electrostatic and host–guest interactions. β-Cyclodextrin (CD + ) modified with quaternary ammonium groups was used as the electropositive binding site, and carboxymethyl cellulose (CMC) in a double-network hydrogel structure was used as the electronegative binding site. The double-network structure was obtained by controlling the crosslinking of CMC and hydroxyethyl cellulose (HEC) in the presence of epichlorohydrin. The electrostatic interaction was used to graft CD + onto the electronegative double-network structure. Scanning electron microscopy indicated an obvious change in the cellulosic double network after grafting of CD + . The grafting content of CD + in CD@HEC-CMC-gel is determined as 93.10 ± 0.74% by the photometric titration method. In order to evaluate the assembling and releasing ability, ibuprofen (IBU) was selected to be encapsulated in CD + @HEC-CMC-gel by host–guest interaction. In addition, the release of IBU by the hydrogel beads was explained by several kinetic models. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46593.
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高影响因子
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