JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 28
·e54044
·
IF 3
Zhoufeng Wang,Yingying Liu,Bolin Wang,Xiubo Long,Junwei Hu
A series of polyarylates composed of different bisphenol monomers were synthesized by interfacial polymerization using 9,9-bis(4-hydroxyphenyl)fluorene (BHPF), 2,2-bis(4-hydroxyphenyl)butane (BPB), terephthaloyl chloride (TPC), and isophthaloyl chloride (IPC) as raw materials. The DFT calculations showed that the energy required for the reaction of BHPF with TPC/IPC was between 15.82 and 16.04 Kcal/mol, which was higher than the energy required for the reaction of BPB with TPC/IPC of 8.05–8.40 Kcal/mol. The solubility test showed that the solubility of BHPF-BPB-type polyarylate was better than that of BPB-type polyarylate in various organic solvents with T g ranging from 199.3 to 215.0°C, indicating that the solubility was improved while increasing the T g of the products. The weight loss ( T 5% ) and maximum weight loss ( T max ) of BHPF-BPB-type polyarylates under N 2 atmosphere ranged from 464.6–489.4°C and 521.7–534.6°C, indicating good thermal stability. The tensile strength of the BHPF-BPB-type polyarylates ranged from 53.21 to 61.23 MPa, Young's modulus ranged from 1479.66 to 1867.23 MPa and elongation at break ranged from 19.5% to 30.1%. The mechanical property test showed that the BHPF-BPB-type polyarylates have high tensile strength. These characteristics indicate that BHPF-BPB-type polyarylates have a very broad potential for application in engineering plastics.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 27
·e54009
·
IF 3
Zhiqiang Song,Fei Xu,Heng Wang,Zhencai Zhang,Mi Feng,Yiwen Zhang,Zhao Yang,Jingxue Xie,Dan Su,Tao Li
Poly(isosorbide carbonate) (PIC) is an example of the shift from fossil to bio-based feedstocks in polymeric materials. However, the naturally high hygroscopicity of isosorbide may lead to the bad dimensional stability of its polymers, limiting its application. This work aims to develop a series of isosorbide-based copolycarbonates by introducing hydrophobic groups, such as alkane chains and aromatic rings, into the polymer backbone via one-pot melt polycondensation. As expected, the molecular structure and steric hindrance of the comonomer have a remarkable effect on the water absorption of the copolycarbonates. Among the comonomers, tricyclo[5.2.1.0(2,6)]decanedimethanol with an alkane skeleton bridge effectively reduces the saturation water absorption by 61% compared to PIC. The water absorption mechanism and kinetics of the copolycarbonates are investigated. Moreover, the incorporation of comonomers in PIC not only exhibits stronger hydrophobicity, but also significantly improves its optical properties. Copolycarbonates obtained have a light transmittance of 92% and a refractive index of 1.5394, which are higher than those of PIC, along with better thermal stability, flexibility, and lower glass transition temperature. This work provides a new strategy for the design of isosorbide-based polycarbonates for use in optics.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 25
·e53951
·
IF 3
Yifei Wu,Kun Wu,Fei Xiao,Enxiang Jiao,Jun Shi,Mangeng Lu
High thermal conductivity liquid crystal polymer has become a hot topic in electronic device research. Herein, we introduce a series of thermotropic liquid crystals synthesized by diphenyl diol, m-phthalic acid, and 5-hydroxyisophthalic acid. The intermolecular forces are tuned by adjusting the ratio (0, 20%, 40%, 60%, 80%, 100%) of monomers containing hydrogen bond donors in copolymers. The formation and dissociation of hydrogen bonds are analyzed from the red shift and blue shift of infrared spectra at variable temperatures. The thermal conductivity is increased to 0.31 Wm −1 k −1 . Meanwhile, its mechanical properties and thermal stability have improved significantly. A sharp increment of 2120% in tensile strength was observed, the maximum tensile strength is 17.39 MPa. While Young's modulus increased from 0.26 to 1.224 GPa. The increase in intermolecular forces is the main reason for this result. Moreover, X-ray single-crystal diffraction, polarizing microscope, differential scanning calorimetry, and thermogravimetric analysis (TGA) were also analyzed to further explore the thermal conduction mechanism. The formation of hydrogen bonds makes the linear polymer chain segments undergo reversible cross-linking, which affects their crystallization behavior and provides more thermal conduction pathways. By controlling the number of hydrogen bond donors to control the cross-linking density, the thermal conductivity and mechanical properties can be greatly improved.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 24
·e53960
·
IF 3
Yanqin Shi,Lukai Chen,Songyan Lu,Yuchen Yao,Si Chen,Huiwen He,Meng Ma,Xu Wang
A new kind of highly efficient organic zinc thermal stabilizer for polyvinyl chloride (PVC), zinc arginine stearate [Zn(Arg)(St)], is designed by introducing the arginine and stearate to the same zinc atoms to regulate the binding energy between anions and cation. Gaussian soft is used to calculate the binding energy. The results of Fourier transform infrared spectra, elemental analysis, thermogravimetric analysis, and differential scanning calorimetry show that Zn(Arg)(St) has been successfully synthesized. Zn(Arg)(St) stabilized PVC displays excellent Congo red, static and dynamic thermal stability time, especially the excellent initial whiteness and whiteness retention time. The thermal stability mechanism of Zn(Arg)(St) attributes to the different binding energy between the two anions and zinc cation, which results in Zn(Arg)(St) continuously replacing the unstable chlorine atoms step by step by Arg and St anions. Moreover, the amino group in Arg could complex ZnCl 2 to inhibit the “zinc burning” effect, and the guanidine group could absorb HCl to inhibit the “autocatalytic effect” of HCl. In addition, Zn(Arg)(St) has a remarkable lubrication effect, which also enhances the thermal stability of PVC. Thus, Zn(Arg)(St) is an environmentally friendly thermal stabilizer for PVC with an excellent thermal stability effect. Importantly, this work also proposes a new method to design highly efficient thermal stabilizers for PVC.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 25
·e53969
·
IF 3
Jiayan Shi,Chunhua Wei,Mengyu Deng,Lei Liang,Yanqing Tian
Pressure-sensitive paints (PSPs) have been demonstrated to be very important for aerodynamics research. In order to improve the pressure sensitivity and adhesion ability of PSP, herein, a series of fluorine-containing copolymers compositing of an oxygen and pressure-responsive probe derived from platinum(II)-5,10,15,20-tetrakis-(2,3,4,5,6-pentafluorophenyl)-porphyrin (PtTFPP) named as poly[(tBs) a - co -(TFEM) b - co -(PtTFPP-1MA) c ] were synthesized and investigated as PSPs. These PSPs were constructed with different fluorine ratios for the investigation of the effect of fluorine contents on PSPs. Especially, PSP (F 0.33 ) with the trifluoroethyl methacrylate (TFEM) molar ratio of 33% in the copolymers could adhere well to the surface of an aircraft model. F 0.33 showed high oxygen sensitivity ( I 0 / I 100 = 32.87), reasonable response time to oxygen (44 s), high pressure sensitivity ( S P = 0.75%/kPa at 20°C) and low temperature response ( S T = −0.77%/°C at 100 kPa). F 0.33 was further sprayed on the surface of a delta wing of an aircraft model and its pressure response was verified in a wind tunnel. The data from F 0.33 film at the same wind speed and position were close to the pressure data measured by using traditional method using open pressure holes, showing the potential application of these PSPs.
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 23
·e53932
·
IF 3
Hao Dong,Xiangming Hu,Jindi Liu,Yuntao Liang,Wei Wang,Hui Tang,Fusheng Zhu,Zhenglong He,Peng Wang
In order to solve the problem of formaldehyde release from the traditional phenolic foam (PF) in the process of coal mine filling and plugging. In this paper, the effect of different factors on the efficiency of formaldehyde trapping agents were studied by adding formaldehyde trapping agents containing amino compounds after PF synthesis. The effect of formaldehyde trapping agents on the performance of resin was investigated. The results showed that the addition of formaldehyde trapping agents could greatly reduce the residual formaldehyde content in phenolic resin. Fourier-transform infrared spectroscopy (FTIR) data showed that the addition of formaldehyde trapping agent not only successfully prepared PF, but also produced a stable formaldehyde trapping agent product. Compared with the unmodified PF, the pore size and foaming rate of the modified PF decreased in varying degrees, and the foaming temperature also decreased in varying degrees. Among them, urea modified phenolic resin (PUF) had the highest formaldehyde removal efficiency. It had the t lowest heat release during combustion and the foam pore size was large and uniform. In addition, through the application of urea-modified PF in the goaf return air corner fissure sealing application, it was found that the CO concentration in the goaf maintained at the lowest state of 0.002%. It has reached the national industry standard of polymer gas plugging materials and conforms to the green development concept in the field of coal mine fire prevention.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 24
·e53955
·
IF 3
Xiaodong Bai,Licheng Deng,Yancheng Yan,Hua Hu,Yumei Luo,Xuetong Cai
Lost circulation will cause huge economic losses every year. In order to effectively reduce the harm of lost circulation to drilling, it is particularly important to use reasonable and efficient lost circulation materials (LCM). As a kind of water-absorbing, expandable and deformable LCM, water-absorbing resin can adapt to holes and cracks of different sizes. In this study, a kind of encapsulated water-absorbing resin LCM (PMMA/PNAD) was proposed. The water-absorbing resin is synthesized by acrylamide (AM), 2-acrylamide-2-methyl-propane sulfonic acid (APMS) and diallyl dimethyl ammonium chloride (DMDAAC) as reaction monomers through aqueous solution polymerization. The shell material is polymethylmethacrylate (PMMA), which is coated on the surface of the water-absorbing resin by oil phase separation method. The results of the experimental evaluation indicate that the water-absorbing resin possesses robust water-absorbing and swelling properties, which significantly affect the rheological properties of the drilling fluid. However, the coated shell can effectively mitigate the impact of the absorbent resin on the drilling fluid. Under the formation environment of 100°C or 2 Mpa, the shell can soften or break to release the absorbent resin. The lost circulation control performance test results show that PMMA/PNAD has good pressure bearing capacity, and can still maintain good lost circulation control at 6.9 Mpa.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51921
·
IF 3.125
Hongxu Meng,Zhisong Li,Linbo Wu,Bo-Geng Li,Yumiao Hu,Kecheng Wang
Poly(ethylene 2,5-furandicarboxylate) (PEF) is a biobased polyester with high gas barrier properties, tensile modulus, and strength. In PEF chain, in addition to ethylene furandicarboxylate repeat unit, there is also a small amount of diethylene glycol furandicarboxylate (DF) unit which is formed by etherification side reactions. However, the effect of DF unit in a wide composition range on polymer properties is still unclear. In this study, random poly(ethylene-co-diethylene glycol 2,5-furandicarboxylate) (PEDF) copolymers were synthesized via melt copolycondensation of 2,5-furandicarboxylic acid, ethylene glycol and diethylene glycol. The copolymers were characterized and evaluated by intrinsic viscosity, 1 H NMR, thermal transition, thermogravimetric analysis, tensile, impact, and O 2 penetration tests. The copolymers are amorphous in the full composition range. The presence of less than 58 mol% DF unit in PEDFs neither improves the tensile ductility nor deteriorates the oxygen barrier performance, but reduces the glass transition temperature clearly. In comparison with poly(ethylene terephthalate), the PEDF copolymers containing <58 mol% DF unit have higher tensile modulus, strength, and O 2 barrier properties.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51922
·
IF 3.125
Tianqi Chen,Mengjin Chen,Chaoyang Fu
Compared with small organic molecular, polymer corrosion inhibitors exhibit better anti-corrosion performance in neutral medium because of multiple adsorption sites and temperature toleration, which are becoming the focus of scholars in the field of water treatment. However, the effect of molecular weight of polymer inhibitors is rarely studied, which has a significant impact on its performance. Polyethyleneimine (PEI) containing polar groups and numerous N atoms is a kind of water-soluble polymer which is prone to being modified, and three kinds of modified polyethyleneimine (PEPA) inhibitors are synthesized by PEI with different molecular weights (600, 1800, 10,000) in this work. The anti-corrosion performance of PEPA for Q235 carbon steel in neutral medium was evaluated by electrochemical measurements (Tafel polarization plots and electrochemical impendence spectroscopy [EIS]), weight-loss tests, and surface morphology analysis. Results of weight loss method and other measurements confirm that PEPA is an excellent polymer inhibitor, and the inhibition performance of PEPA synthesized by PEI with molecular weight of 1800 is the best with an inhibition efficiency of 94.6% at a dosage of 200 mg/L at 298 K in neutral medium.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51949
·
IF 3.125
Mengnan Ruan,Dandan Guo,Defu Zhu,Zhifeng Liu
Natural rubber (NR) composites filled with modified aluminum nitride (AlN) particles were successfully fabricated with high thermal conductivity and dielectric constant. To boost the interfacial interactions form thermal conductive networks between AlN and NR matrix, a mussel-inspired polydopamine and γ-(2,3-epoxypropoxy)propy trimethoxysilane (KH560) grafting were combined to yield AlN-PDA-KH560. The double-layer structure led to good filler dispersion of AlN-PDA-KH560 with decreased interfacial thermal resistances. As a result, the largest thermal conductivity in 30 phr AlN-PDA-KH560/NR was reached to 0.48 W/m K, which was 2.28 times larger than pure NR. Furthermore, the 30 phr AlN-PDA-KH560/NR composite also had relatively high dielectric constant (3.95 at 10 3 Hz) and low dielectric loss (~0.01 at 10 3 Hz), benefiting for long time operation and thermal diffusion. This strategy provides a facile, low-cost, and scalable method to fabricate high electrical and thermal conducting composites for strong potential in thermal management for electronic devices.
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52049
·
IF 3.125
Xiangqian Jiang,Chuncheng Ban,Ling Li,Jiandong Hao,Ningqiang Shi,Weiping Chen,Peng Gao
In recent years, the thermoelectric properties of one-dimensional boron nitride nanomaterials have gradually attracted widespread attention of researchers in the world. In this paper, boron carbon nitrogen based composite nanofiber films were prepared by electrospinning. It is found that the diameter of nanofibers decreases in BCNNTs/PVA/PEDOT composite films when electrospinning voltage rises, while diameter increases as PVA and BCNNTs concentration increase of electrospinning precursor solution. Finally, thermoelectric power factor is investigated of the composite nanofiber films. It is verified that thermoelectric properties of the films closely related to electrospinning quality. However, fiber density of single-layer BCNNTs/PVA/PEDOT nanofiber film is too low, folding increase the density and thickness of multilayer BCNNTs/PVA/PEDOT nanocomposite fiber films, and the thermoelectric characteristics are significantly improved. The Seebeck coefficient can reach 3.62 mV/K and the power factor is 29.09 nW/mK 2 .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52029
·
IF 3.125
Mengyuan Tian,Fuhua Xin,Yanjing Gao,Jun Nie,Fang Sun
A near-infrared (NIR)-triggered photo/thermal dual-responsive composite carrier (UCNPs-NG-PDA) was designed and fabricated by the incorporation of upconversion nanoparticles (UCNPs), coumarin-based photo/thermal-responsive nanogel (NG) with uniform particle size (193 nm) and polydopamine (PDA) particles. UCNPs-NG-PDA has good photothermal conversion capability because of the introduction of PDA. The light and heat dual-responsiveness of coumarin-based nanogels markedly enhances the drug release of UCNPs-NG-PDA. Under NIR irradiation for only 20 min, the final cumulative release reaches 79.4% and is much higher than that (58.8%) under UV irradiation. More remarkably, the UCNPs-NG-PDA exhibits an excellent biocompatibility and has fascinating application prospects in drug delivery fields.
✓ 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）