JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 23
·52307
·
IF 3.057
Yi Zhang,Han Wang,Tao Xu,Liyun Wu,Haoting Niu,Xuhua He,Nanyang Wang,Yagang Yao
Boron nitride-based polymer composites possess high thermal conductivity and are commonly used for thermal management. However, the poor interfacial interaction between the fillers and matrix and the random distribution of fillers restrict further improvement of the thermal conductivity and other properties of these composites. Therefore, we propose a strategy to fabricate highly thermally conductive composites with multifunctionalities by interacting boron nitride as the filler with a poly(vinyl alcohol) (PVA) matrix after a ball milling modification, forming a layered nacre-like structure through vacuum filtration, and hot pressing. The hot-pressed functionalized boron nitride nanosheets/PVA (HPF-BNNSs/PVA) composites exhibit a high in-plane and out-of-plane thermal conductivity of 29.4 W/mK and 2.5 W/mK, respectively, at 70 wt% functionalized boron nitride nanosheets (f-BNNSs) loading. This extraordinary enhancement in thermal conductivity can be ascribed to the formation of an effective thermally conductive network of fillers inside the polymer matrix. Additionally, the HPF-BNNSs/PVA composites exhibit a low dielectric constant of 3.5, a low dielectric loss of 0.04, high electrical resistivity of 4 × 10 9 Ω·m, and outstanding mechanical properties (e.g. a tensile strength of 62 MPa and a Young's modulus of 225 MPa) at 70 wt% f-BNNSs loading. Overall, this study provides a green and facile method to fabricate multifunctional and highly thermally conductive composites for thermal management applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52332
·
IF 3.057
Xibin Wu,Zhimei Wei,Jie Yang,Gang Zhang,Shengru Long,Xiaojun Wang
The purification of dye wastewater plays a critical role in water pollution treatment. Adsorption is a cheap and effective separation technology but is limited by the reuse of adsorption materials. Ultrafiltration membranes have a relatively high flux but their pores are too large to reject small dye molecules. In this study, negatively charged oxidized poly (arylene sulfide sulfone) (O-PASS) membrane, NMP pretreatment oxidized O-PASS (N-O-PASS) membrane, and O-PASS@UiO-66-NH 2 /O-PASS composite membranes were fabricated to retain cationic methylene blue (MB) from wastewater by combining ultrafiltration and adsorption techniques. The increased porosity of the N-O-PASS membrane provides more available adsorption sites for an equilibrium MB adsorption amount of 22.5 (mg g −1 ) and 100% rejection in the first 10 min during ultrafiltration with a pure water flux of 162.32 (L m −2 h −1 bar −1 ). Due to the enhanced hydrophilicity and separating property by deposited UiO-66-NH 2 particles and PASS resin, O-PASS@UiO-66-NH 2 /O-PASS composite membrane shows a flux of 170.32 (L m −2 h −1 bar −1 ) and a 100% MB rejection in 60 min with great reusability. The O-PASS@UiO-66-NH 2 /O-PASS composite membrane is a new promising membrane for the removal of dyes from wastewater. Meanwhile, the superior solvent resistance endows it great adaptability in wide applications, especially in harsh conditions.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 27
·e52485
·
IF 3.057
Xiaoshuai Zhu,Xijue Li,Hao-Yang Mi,Xin Jing,Binbin Dong,Ping He,Chuntai Liu,Changyu Shen
Thermoplastic polyurethane (TPU) foams are commonly used buffering materials due to their lightweight, high elasticity, and excellent energy absorption properties. Improving their compressive property without increase foam density is a challenge for TPU foams. Herein, graphene oxide (GO)/TPU composite foams containing micro-sized wrinkles on the cell surface were fabricated by a novel dynamic supercritical carbon dioxide (scCO 2 ) foaming method. The addition of GO created hydrogen bonding and physical crosslinking sites with the TPU molecules, which acted as nucleation agents to improve the cell density of the GO/TPU foams. With the increase of GO content, the mechanical properties of GO/TPU foams were significantly enhanced, and the wrinkled foams prepared via dynamic scCO 2 foaming displayed superior compressive modulus, strength, energy absorption, and recoverability compared with the counterpart foams without wrinkly structure. The wrinkled GO/TPU foams with 0.5 wt% GO revealed higher expansion ratio, lower foam density, superior compressive property and energy absorption than both neat TPU and 1 wt% GO foams owing to the reinforcing effect of the wrinkly structure. This study is of great significance in the development of low-density composite foams with enhanced compressive performance by wrinkly structures.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 26
·e52432
·
IF 3.057
Jialiang Chen,Chichao Li,Xi Chen,Xuming Zhang,Hongbing Jia,Zhenyang Luo,Yanlong Luo
Epoxidized solution-polymerized styrene butadiene rubber (ESSBR) with different epoxidation degrees was prepared using formic acid as a catalyst. Experimental methods and density function theory calculation confirms that peroxyformic acid preferentially attacks trans-1,4-butadiene, and then cis-1,4-butadiene, and 1, 2-butadiene is not epoxidated due to high energy barrier. Two SiO 2 /graphene oxide hybrids covalently linked with bis-[3-(triethoxysilyl)propyl]-tetrasulfide or 3-aminopropyltriethoxysilane (KH550) were prepared and named SiO 2 @TESPT@GO and SiO 2 @KH550@GO, respectively. The results for ESSBR composites filled by hybrid fillers indicate that the increase of epoxy degree can greatly improve the wet skid resistance while maintaining rolling resistance. Besides, in the case of the same epoxy degree, the rolling resistance of composites using hybrid fillers is lower than that of using SiO 2 only. Notably, the SiO 2 @TESPT@GO/ESSBR composite with high epoxy degree (10.09%) has a good balance between wet skid resistance and low rolling resistance. Molecular dynamics simulation was further employed to perform fixed and cyclic stretching to give the mechanism for mechanical properties. Binding energy and mean square distance illustrate that that as the epoxy degree increases, on the one hand, the strong filler-matrix interactions will make the movement of ESSBR chains keep up with the strain. On the other hand, the strong filler-matrix and inter-chain interactions provide more friction. These two factors lead to an increase in hysteresis loss. Besides, only moderate filler-matrix interaction is conducive to the improvement of wet skid resistance, and too strong or too weak interaction is unfavorable.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52361
·
IF 3.057
Xin Rao,Zhiqiang Ou,Qi Zhou,Lingying Fu,Yue Gong,Qin Wen,Xueyu Du,Chen Liang
Poly(vinyl alcohol) (PVA) based materials have received enormous attention ascribed to the merits of good mechanical properties, biodegradability, and environmental friendliness, but its widespread applications are severely hindered by poor water resistance. In the current study, self-made coir cellulose nanocrystal (CCNC) was applied as a reinforcing filler together with a cost-effective and green cross-linker (oxalic acid, OA) for preparation of CCNC/OA/PVA composite film via solution casting. After the thermal treatment of 120°C for 2 h, the ultimate product exhibited remarkable improvements in tensile strength (132.4 MPa), Young's modulus (4427.1 MPa), water resistance (degree of swelling: 33.6%; contact angle: 84.7°; solubility: 0.9%), and thermal stability relative to the cleavage of the polymer chains (depolymerization). A reinforced synergetic effect of physical interaction (hydrogen bond) and hydrophobic ester linkages has been suggested according to the comprehensive analyses of functional groups, crystal structure, thermal behavior and stability, and fracture surface morphology.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52209
·
IF 3.057
Yong Guo,Zhongwei Chen,Yuan Yu,Tingting Chen,Qingwu Zhang,Changxin Li,Juncheng Jiang
A new-type flame retardant DEZ of bi-DOPO compound containing bi-hydroxy and two amino groups, was synthesized from terephthalonitrile, hydroxylamine hydrochloride, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and used with curing agent 4,4′-diamino-diphenylmethane to prepare flame retard epoxy resin (EP) composites. 1 H and 31 P nuclear magnetic resonance spectra and Fourier transform infrared spectra have determined the chemical structure of DEZ. The properties of cured EP composites were explicitly evaluated by differential scanning calorimeter, thermogravimetric analysis, the limiting oxygen index (LOI), vertical burning (UL-94) test, cone calorimetry test, and flexural test. The 1 wt% addition of DEZ could improve the EP composites by almost 14.4% of flexural strength and 29.6% of flexural modulus, respectively. The LOI of EP composites with 5 wt% of DEZ was 29.7% and EP composites reached a V-0 rating in the UL-94 test, as well as total heat release was decreased by 11.2%. All EP modified by DEZ exhibited a blow-out effect in the combustion process, which was due to the release of pyrolysis gases and incombustible gases containing phosphorus radicals and nitrogen compounds.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52210
·
IF 3.057
Huili Shi,Zhiwei Li,Xiaohong Li,Zhijun Zhang
Doping is a simple and effective method to change material properties. In this work, in order to improve the flame retardant performance of bismuth oxychloride (BiOCl) nanosheets in poly (vinyl chloride) (PVC), for the first time, iron and tin ions were doped into BiOCl (Fe-BiOCl and Sn-BiOCl) via a doping approach, respectively. X-ray diffraction and morphology characterization confirmed that the Fe and Sn ions were doped into the BiOCl lattices, respectively. After doping, PVC composites obtained superior flame retardancy and smoke suppression. With the adding amount of 3 wt% Fe-BiOCl and Sn-BiOCl, the UL-94 test rating of the PVC composites reached V-0, and the peak of heat release rate reduced by 38% and 34%, total smoke production decreased by 55% and 42%, respectively, compared to neat PVC. Thermogravimetric and Thermogravimetric-Fourier Transform Infrared results showed that Fe or Sn doping could further reduce organic volatiles in the gas-phase and improve char residual in the condensed phase, both of which contribute to reducing fire hazards. Tensile properties and tensile modulus of PVC composites increased. In short, it is an economically effective approach targeting to improve the comprehensive properties of PVC through doping Fe or Sn into BiOCl.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 22
·52263
·
IF 3.057
Jie Zhang,Zongwei Guo,Jinpeng Ma,Lingxiao Song,Guorui Yang,Yuhui Ao,Lei Shang,Ming Li
As an important thermosetting resin, epoxy resin (EP) is widely used in the field of composite materials. Long storage time, rapid curing and low viscosity of one-component EP is ideal for preparing composite materials by vacuum assisted resin transfer molding (VARTM). For this sake, we developed and synthesized a new imidazole thermal latent curing agent, 4,7-diimidazol-2,1,3-benzothiadiazole (BTD-MZ 2 ) with a yield of about 75%. The curing behavior, thermal stability and storage time of the prepared EP system was studied by differential scanning calorimeter (DSC), thermal gravimetric analyzer (TGA), modular compact rheometer (MCR), respectively. DSC results showed that EP/17.5 wt% BTD-MZ 2 had a good latent period at low temperature, and can rapidly cure EP when heated to 150°C. TGA results show that BTD-MZ 2 promoted the formation of carbon residue and the residual carbon rate of EP/17.5 wt% BTD-MZ 2 is as high as 37.9%. MCR results show that the storage time of EP/17.5 wt% BTD-MZ 2 at 60°C can reach 850 min. In addition, it could play a role of catalyst used as co-curing agents with aromatic amines for EP. DSC test showed that the addition of 5 wt% BTD-MZ 2 reduced the activation energy of EP/4,4′-diaminodiphenylmethane (DDM) and promoted the curing reaction.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 27
·e52469
·
IF 3.057
Ang Shen,Jinggang Wang,Xiaoqin Zhang,Xuan Fei,Lin Fan,Yanliu Zhu,Yunxiao Dong,Jin Zhu
The polyesters with high T g (≥100°C) and good clarity are desired in fabricating heat-resistance containers such as baby bottles, cups, medical apparatus, and kitchen appliances. In this work, a series of poly(butylene bis[4-(2-hydroxyethoxy) phenyl] sulfone 1,4-cyclohexanedimethylene 2,5-furandicarboxylate) (PBSCFs) that show superior thermal and mechanical properties against current bio-based polyesters were synthesized via a melt polycondensation method. The accurate chemical structures of PBSCFs were confirmed by 1 H-NMR and 13 C-NMR. The SEC results show that PBSCFs have number averaged molar mass ( M n ) in the range of 9700–28,500 g/mol. The T g of PBSCFs increase from 94°C for PBSF to 108°C for PBSCF-50 as the increasing of CHDM unit. Meanwhile, the ductility of PBSCFs also improved with the elongation at break of PBSCF-40 increased to 223%. In addition, the PBSCF-40 sample reported in this paper shows thermal decomposition temperature of 427°C, transmittance of 84.6%, haze of only 0.17%, tensile strength of 74.1 MPa, and tensile modulus of 2287 MPa.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 27
·e52444
·
IF 3.057
Yulin Jiang,Jing Wang,Juehan Wang,Yi Zhuang,Lin Qi,Ganjun Feng,Li Zhang
In this research, we successfully prepared a new kind of core-shell microspheres (PNIPAM@GO) composed of hydrophilic poly (N-isopropyl acrylamide) (PNIPAM) nanoparticles as the core and amphiphilic graphene oxide (GO) nanosheets as the shell through hydrogen bonding and self-assembly in organic solvent. The temperature-sensitive behavior of the PNIPAM core made its average size decrease from 888.3 nm to 630.3 nm with temperature increasing from 25°C to 50°C. And the GO shell could give PNIPAM@GO microspheres remarkable photothermal effects in water under NIR laser irradiation (808 nm) for 20 min. Further, doxorubicin (DOX) and 5-fluorouracil (5-FU) were loaded into the core and the shell with loading efficiency of 81% and 11%, respectively. By turning on/off NIR irradiation, the PNIPAM@GO microspheres could respond to the heat generated from GO shell by volume shrinkage, thus on-demand controlling the drug release. The in vitro biological assessment verified that the samples prepared here were biocompatible. The developed platform shows a potential application in chemo-photothermal therapy of cancers in the future.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 32
·e52478
·
IF 3.057
Yuhao Liu,Ying Lin,Yunsong Wang,Kangning Wu,Bin Cao,Liming Wang
To improve the toughness and hydrophobic property of the cycloaliphatic epoxy resin (CEP), which is vital to application in high voltage insulation of outdoor transmission lines, 3-aminopropyltriethoxysilane was used as the intermediate to prepare the silicone prepolymer by the interaction of the end groups of the CEP and the hydroxy-terminated polydimethylsiloxane. The results showed that the silicone prepolymer segments were self-assembled to form solid dispersion phases distributed uniformly in the CEP. The size of the dispersed phase gradually increased in CEP with more concentration of silicone prepolymer. The tensile strength and static contact angle of the CEP were simultaneously improved when content of the silicone prepolymer reached 10 phr. The tensile strength and static contact angle were mainly affected by the distribution of dispersed phase and by surface tension, respectively. With the increase of Si/C on the surface, surface tension decreased and tended to saturate. Due to small molecule migration, the CEP containing silicone prepolymer was also endowed with hydrophobic transfer properties. This paper affords a method to simultaneously enhance toughness and hydrophobic properties of CEP and deepens fundamental understanding of hydrophobic properties.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 22
·52267
·
IF 3.057
Guo-Yan Ma,Cheng-Jun Wang,Chun-Bao Du,Xi Li,Xiao-Rong Wang
Novel polymeric surfactant (MBSP) is obtained with phosphate esters monomer (PEGMAP) as the functional monomer in the presence of other acrylic monomers. The synthesized MBSP is further used as emulsifier for preparing the corrosion-resistance polyacrylate coatings (PAMBSP). Attenuated total reflection Fourier transform infrared (ATR-FTIR) and nuclear magnetic resonance results show that phosphate esters functional monomer was introduced into the MBSP molecular chains. The surface tension measurements illustrated that with the PEGMAP content 1%, the lowest surface tension 44.45 mN/m and the equilibrium concentration critical micellar concentration (CMC) 1.02 g/L of MBSP are obtained. The stability analysis of the PAMBSP emulsions demonstrates that the Turbiscan Stability Index (TSI) value decreased from 0.64 to 0.32 with the PEGMAP content increased from 1% to 3%. The electrochemical analysis displays that with PEGMAP content 3%, the biggest corrosion potential −0.02 V, smallest etching current density 2.19 × 10 −9 A•cm 2 and biggest impedance modulus 1.46 × 10 7 Ω·cm 2 was obtained.
✓ 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）