JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 31
·e52703
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IF 3.057
Yuanyuan Ren,Wei Deng,Wanyu Li,Hong Zhao
With the popular application of alternating current/direct current (AC/DC) hybrid power grid, ultra-high-voltage (UHV) AC/DC cables of long-distance and large-capacity transmission systems have been strongly demanded. Voltage stabilizers are widely used to resist AC electrical tree of cross-linked polyethylene (XLPE) insulation materials, but poor compatibility with polymer matrix limited improvement of DC insulation performance. In this research, the maleic anhydride-modified 2,4-dihydroxybenzophenone as a novel voltage stabilizer 4-(4-benzoyl-3-hydroxyphenoxy)-4-oxobut-2-enoic acid (MDVS) was synthesized to improve the electrical properties of XLPE. The XLPE-g-MDVS with different contents of MDVS was prepared, and both AC electrical properties and DC electrical properties were tested. The results indicate that the modified XLPE retain the characteristic of voltage stabilizer to resist AC electrical tree and improve breakdown strength, and to exhibit excellent DC insulation performance in a wide temperature range. In the comparison with the pristine XLPE, the graft of MDVS can significantly suppress space charge accumulation and decrease DC conductivity. At 70°C, the maximum amount of space charge density of XLPE-g-1.2wt%MDVS is 56.2% lower than that of XLPE, and the DC conductivity decreases by nearly two orders of magnitude. Furthermore, the DC breakdown strength of XLPE-g-1.2wt%MDVS materials exhibit higher than that of the pristine XLPE. In addition to the self-excited energy dissipation of the voltage stabilizer, quantum chemical calculations demonstrated that the improvement of DC performance attributed to the deep traps introduced by MDVS.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 30
·e52660
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IF 3.057
Hongshun Ran,Wenhui Yan,Wenze Tan,Zhixin Hu,Changxin Huang,Shigang Yang,Zixi Yuan,Xueqin Chen,Cao Li,Ziqiang Xu,Bingbing Jiang
Although nano-porous materials are widely used, they are still difficult to prepare in large size and expand flexibly. In this work, a new method for the synthesis of porous materials is proposed. First, the block polymers were prepared by atom transfer radical polymerization. Through electrostatic spinning, the fiber films were fabricated, then the fibers were modified by surface post-treatment and related Friedel–Crafts alkylation reaction. The pore and CO 2 adsorption properties of the porous fiber films are characterized by nitrogen adsorption–desorption isotherm. In order to improve the pore properties and CO 2 adsorption properties of thin films, the additives and pretreatment process are optimized. The maximum specific surface area of the porous fiber membrane is determined to be 640 m 2 /g, and the CO 2 adsorption capacity is high up to 36.3 wt.% (8.68 mmol/g). Moreover, the porous fiber membrane derived from this strategy is superior in the aspects of large size, convenient adjustment and simple processing, which makes up for the drawbacks of traditional porous materials. The fiber membrane obtained by this strategy has high productivity, and the fiber membrane is easy to be postprocessed, which can be integrated into functional devices, and is widely used.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 28
·e52621
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IF 3.057
Xiao-Qiong Cheng,Wei Liu,Chun Zhang,Xiao-Cheng Chen,Shu-Qian Duan,Hai Fu
In recent years, the problem of oily sewage has seriously affected the ecological environment and human health. Thus, we prepared a novel biodegradable poly (lactic acid) (PLA) membrane with antibacterial property and oil–water separation function via electrospinning method. First, the matter of silver ion glass microbeads (AgGB) loaded with layered double hydroxides (LDHs) and the LDH@AgGB modified with 3-triethoxysilyl-1-Propanamine (APTES) were synthesized. Then, the LDH@AgGB were blended with PLA to prepare PLA/LDH@AgGB composite. And the PLA nanofibrous membranes were electrospun. The results showed that APTES could significantly improve the dispersion and compatibility of LDH@AgGB in PLA matrix. The addition of A-LDH@AgGB could greatly improve the crystallinity, and control the porosity and pore-size of PLA membranes. The maximum water contact angle of the PLA membranes could reach to 109.31°, while the oil contact angle of the PLA membranes decreased to 0° resulting in a high oil absorption capacity, and fast oil absorption rate performance. Meanwhile, the PLA membrane had efficient antibacterial property against Escherichia coli . The reported novel LDH@AgGB and its PLA composite membrane provided a method for designing and preparing environmental-friendly, high-performance materials with both excellent antibacterial property and oil–water separation.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 28
·e52614
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IF 3.057
Quan Long,Xia Li,Yawen Huang,Qiuxia Peng,Xian Li,Liangbo Zhu,Jiajun Ma,Xu Ye,Junxiao Yang
The route via the cross-linking of hyperbranched prepolymers has potential advantage to construct low dielectric constant (low- k ) resins owing to the enhanced molecular free volume in hyperbranched structure. However, it is still a challenge to prepare hyperbranched resins with good film-forming property and low- k . In this paper, two hyperbranched polycarbosilanes with reactive benzocyclobutene groups were synthesized via hydrosilylation reaction to avoid the generation of Si O bonds for enabling the low polarity of chemical bonds. The spacing groups including phenyl or ethylene were incorporated into the hyperbranched structures, and the effect of the spacing groups on the physicochemical properties of hyperbranched polycarbosilane derived resins were investigated. The phenyl groups were found to effectively decrease the dielectric constant ( k ), while endowing the resins with good film forming ability and thermostability. The UV/thermally cured phenyl group resin owing to dual crosslinked structure, the patterns would not be deformed significantly during thermally cured process. Both hyperbranched polycarbosilane derived resins could be potential photoresists.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 32
·e52478
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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.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 27
·e52469
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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.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 25
·e52376
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IF 3.057
Haofei Sima,Yanlong Sui,Chunling Zhang
Mechanical exfoliation of graphene (MEG) and reduced graphene oxide (RGO) are fabricated with using graphite and they are used as fillers to improve the electromagnetic interference (EMI) shielding performance and thermal stability of polysiloxane composite foam. Since graphene builds a conductive network in the matrix and at the same time enhances the impedance mismatch between the syntactic foam and the external free space, the total shielding effectiveness (SE total ) of the composite foam can reach up to 4.74 dB, which is 500% higher than that of pure foam. Moreover, the layered structure of graphene can restrict the small molecules generated during the foam pyrolysis process from leaving the system, and also increases the maximum decomposition temperature of the composite foam (increased from 431.8 to about 500°C), which improves the thermal stability of the foam. These results indicate that the combination of graphene in polysiloxane foams produces composite foams with multifunctional properties, suitable for applications requiring EMI shielding and thermal performance.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 25
·e52394
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IF 3.057
Ruilong Ran,Yan Peng,Lang Xiao,Yanlai Wang,Tonghua Zhang,Zhongwen Liu,Zhi Li
Antibacterial wound dressings can kill bacteria around the wound and then accelerate the wound healing. To fabricate an antibacterial membrane for potential application of wound healing, poly(lactic- co -glycolic acid) (PLGA), silk fibroin (SF), and natural antimicrobial agent aloe anthraquinone (AA) were blended for electrospinning. The electrospun PLGA/SF/AA fibrous membrane consists of smooth and uniform fibers with an average diameter of 583 ± 112 nm. The stress of the PLGA/SF/AA fibrous membrane is 3.88 ± 0.34 MPa, which can ensure its application in skin wound healing. Owing to the good hydrophilicity of blended SF, PLGA/SF/AA fibrous membrane can release 47% of AA at 48 h and 62% of AA in 15 days. PLGA/SF/AA membrane also exhibits good antimicrobial properties and cell compatibility. These results indicate that the fabricated PLGA/SF/AA fibrous membrane in this study has a good application potential for wound healing.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 25
·e52383
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IF 3.057
Jin Li,Yuxiu Yu,Pucha Zhou,Haojie Li,Yaodong Liu
In this study, non-solvent induced phase separation (NIPS) is used to prepare polyacrylonitrile (PAN) based membranes. A thorough analysis on the correlations between coagulation conditions and membrane structures was carried out according to Hansen solubility parameters of coagulants and solvents. When coagulant is various, a larger Hansen solubility distance ( R a ) between PAN and coagulant leads to a quicker phase separation and faster growth of finger-like pores. By comparison, when PAN solvent is tuned by adding small amount of water, the R a plays totally different roles for the formation of dense layer and the growth of finger-like pores. The structural variations of PAN membranes have been mapped in Hansen space according to the R a . Additionally, the low temperature induced sol–gel transition of PAN solution also affects the pore structures of the resultant membranes. These results would be helpful for better understanding the NIPS and fabricating PAN and other types of polymer membranes with desired structures and performances.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52342
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IF 3.057
Xu Han,Ying Guo,Huanhuan Cai,Xiang Li,Jiangnan Ding,Xiaojuan Zhao,Heng Zhou,Wantao Guo,Wei Huang,Tong Zhao
To improve the flame retardancy of vinyl epoxy (VE) resins more effectively, a half-cage and cage structure polyhedral oligomeric silsesquioxanes (P/N-POSS) containing phosphorus and nitrogen was synthesized by a one-step Kabachnik-Fields reaction from paraformaldehyde, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 3-aminopropyltriethoxysilane. It was then blended with tetrabutyl titanate (TBT) in VE resins to construct a phosphorus-nitrogen-silicon-titanium synergy flame retardant system. P/N-POSS was well dispersed in the VE matrix at low loadings (≤4 wt%). With the addition of only 4 wt% P/N-POSS and 0.2 wt% TBT, the LOI value reached 29.2 and the UL-94 grade passed V-1 rating. Moreover, compared with VE-0, the peak heat release rate, total heat release, smoke production rate and total smoke production decreased significantly. The investigations on pyrolysis volatiles and char residue of cured VE composites revealed that the excellent flame retardancy of the VE composites were due to the superior free radical capturing ability, the dilution effect of P/N-POSS in the gas phase, and the promoting the carbonation effect of P/N-POSS, the catalyzing char formation ability of TBT in the condensed phase. Meanwhile, VE composites exhibited improved mechanical properties, thermal stabilities and retained the low viscosity and good processability of VE resins.
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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.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 29
·e52633
·
IF 3.057
Chenyu Zhu,Xue Zhang,Fuzhi Li,Xuan Zhao
Thin-film composite (TFC) nanofiltration (NF) membranes have been fabricated on polyvinylidene fluoride (PVDF) substrates to separate Cl − and SO 4 2− . With increasing polyvinylpyrrolidone (PVP) content (0–1.00 wt%) in PVDF casting solution, the corresponding substrates have similar surface pore size and hydrophilicity, but have enlarged surface porosity and bulk pore size. Obvious defects were found on TFC membrane surface, which were fabricated on the substrate with large and deep finger-like pores. On such substrates, piperazine solution is prone to sink to the pore bottom and cannot react with trimesoyl chloride to form a defect-free polyamide layer. Different from previous reports, the bulk pore size and structure, especially for the finger-like pore, is found to be a key factor influencing the interfacial polymerization (IP) process. The optimal TFC membrane was prepared on the substrate with 0.15 wt% PVP in casting solution, which had crater-shaped ridge-valley structures, relatively high permeability and the largest separation factor of 4.66 for Cl − and SO 4 2− . Although the NF performance needs to be further improved, the results shed lights on the important effects of the substrate bulk pore size and structure on the IP process, which will enlarge the knowledge on the impact of substrate on IP process.
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高影响因子
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