JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 30
·48897
·
IF 2.52
Di Li,Kai Liu,Jian Tang,Zixu Cui,Jing Hua
In this study, with Mo-based catalytic systems consisting of molybdenum pentachloride (MoCl 5 ) as the main catalyst, alkyl aluminum as the cocatalyst and organophosphorus compound as the ligand, high 1,2-orientation butadiene (Bd)-styrene (St) copolymers were prepared by the coordination polymerization. The effects of phosphorous ligand, alkyl aluminum, polymerization temperature, polymerization time and monomers feed ratios on the monomer conversion and intrinsic viscosity of copolymers were explored in detail. The experimental results indicated that with MoCl 5 •TBP (tributyl phosphate)/Al(OPhCH 3 )(i-Bu) 2 as the catalytic system to initiate Bd-St copolymerization, the reactivity ratios of butadiene and styrene monomers are 3.64 and 0.16, and the 1,2-structural content in the resulting copolymers is over 80%, regarded as high 1,2-orientation Bd-St copolymers. All these results provided a basis for the design of catalyst used to prepare high 1,2-orientation Bd-St rubber. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48897.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 6
·49813
·
IF 2.52
Yingtong Pan,Zhonglin Luo,Biaobing Wang
Amino trimethylene phosphonic acid piperazine (ATPIP) salt, as a novel charring agent, is prepared via a simple ionic reaction in distilled water using amino trimethylene phosphate (ATMP) and piperazine as raw materials. The synergistic flame retardant effect of ATPIP and ammonium polyphosphate (APP) as an intumescent flame retardant (IFR) is investigated by various characterization and testing methods. The results show that the polypropylene (PP)/modified APP with piperazine (MAPP)/ATPIP ternary blend passes UL-94 V-0 rating and achieve a limiting oxygen index (LOI) of 30% at a loading level of 25 wt% IFR (MAPP:ATPIP = 3:1). Meanwhile, the total smoke production (TSP) value of IFR-PP samples is 3.3 m 2 , which decreases by 93.2% compared with that of pure PP, exhibiting excellent smoke suppression performance. Besides, the analysis of gaseous pyrolysis products and char residue indicates that the IFR-PP samples show a synergistic flame-retardant mechanism including the gas phase and the condensed phase.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 48
·45510
·
IF 1.86
Chunmiao Xia,Yingwu Luo
Bitumen emulsions have often been modified by styrene–butadiene rubber latex. The modified bitumen can have excellent low-temperature cracking resistance, but rutting resistance at high temperature still remains poor. In the current work, for the first time, a stable poly(styrene- b -isoprene- b -styrene) (SIS) triblock copolymer latex is synthesized by reversible addition–fragmentation transfer (RAFT) emulsion polymerization. Based on this, a simple heterocoagulation process is developed to prepare the bitumen emulsions modified by SIS. The heterocoagulation results in hybrid particles of SIS shell and bitumen core. With addition of 5 wt % SIS, a continuous polymer-rich phase could be formed in the modified bitumen once the modified emulsion was broken down. The bitumen modified by 5 wt % SIS shows a significant increase in complex modulus at high temperature and a significant decrease in loss tangent, suggesting excellent resistance to rutting at high temperature, which is consistent with the significant increase in softening point from 41 °C for the base bitumen up to 64 °C. Meanwhile, the ductility at 5 °C of the modified bitumen is also dramatically increased from 1.4 cm for the base bitumen to 40 cm, indicating the low-temperature cracking resistance should also be much enhanced. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45510.
研究领域:
材料科学
·
高分子科学
·
土木工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 125
·期 4
·3092-3099
·
IF 1.289
Suwen Ye,Licheng Tan,Yiwang Chen,Junchao Wei,Weihua Zhou
A series of aliphatic biodegradable poly(butylene succinate)- co -oligo( L -valine) (PBSVAL) copolyesters were synthesized with dimethyl succinate, 1,4-butanediol (BDO), and oligo( L -valine) (OVL) as reagents. The GPC results show that the weight average molecular weight ( M w ) of the copolyester with a feed ratio (PBS/OVL) of 0.9/0.1 (PBSVAL 10 ) is 4.9 × 10 4 g/mol, and its polydispersity index is 1.68. All the copolyesters were more thermally stable than the pristine poly(butylene succinate) (PBS). The incorporation of valine units into the copolyesters eventually led to the decrease of the crystallization temperature, melting temperature, while increase of crystallization enthalpy and melting enthalpy. The crystal structure of the copolyesters is similar to pure PBS except for higher degrees of crystallinity; also there was a trend to higher degrees of crystallinity with increasing content of valine. From the enzymatic degradation experiment, it is clear that the PBSVAL 10 copolyester shows less weight loss as compared to pure PBS which is due to PBSVAL 10 with higher degree of crystallinity. The morphology of the copolyester films after degradation was also studied by the scanning electron microscopy. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 41
·45405
·
IF 1.86
Weijie Li,Jian Hao,Pucha Zhou,Yaodong Liu,Chunxiang Lu,Zhengfang Zhang
In this study, we systematically explored the dependence of the homogeneity and sol–gel transition temperatures of various polyacrylonitrile (PAN) solutions on the solvent solubility parameters. The Cole–Cole slope was used to characterize the solution homogeneity, and we found that the PAN/dimethyl sulfoxide (DMSO) solution, which had a smaller Hansen solubility parameter distance between the solvent and PAN, showed better solution homogeneity than the PAN/dimethylformamide and PAN/dimethylacetamide solutions. Additionally, we found that both heating and cooling were able to cause the gelation of the PAN solution, although their mechanisms were totally different. The gelation caused by heating was ascribed to the nitrile–nitrile coupling of PAN chains, whereas the gelation caused by cooling was due to the solvent bridge effect. In this case, DMSO, which had the highest polarity and the strongest interactions with nitrile groups, caused the highest gelation temperature of the PAN solution during cooling. The gelation temperature of the PAN solution exhibits dependence on its solvent polarity. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45405.
研究领域:
高分子科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 10
·45935
·
IF 1.86
Nigus Mesele Tsegay,Xiang-Yun Du,Kangzhe Ma,Qing Li,Cai-Feng Wang,Su Chen
Infrared laser-ignited horizontal frontal polymerization is applied for the synthesis of unsaturated polyester resin (UPER) by copolymerizing unsaturated polyester with styrene (St), methyl methacrylate (MMA), and 2-dimethylamino ethyl methacrylate (DMAEMA) monomers. Dependence of frontal velocity and temperature on the initiator and monomer concentration is discussed for St-based UPER. These resins have also been characterized by Fourier transform infrared, thermogravimetric analysis, and scanning electron microscopy. The results reveal St-based resins have superior crosslinked networks. Besides, the thermo-pH responsiveness behaviors of DMAEMA-based resins are demonstrated by swelling measurements under the conditions of different temperatures and pH values. Moreover, by introducing CdSe@ZnS quantum dots and CsPbBr 3 perovskites into St- and MMA-based resins, respectively, we realize the in situ generation of CdSe@ZnS-UPER and CsPbBr 3 -UPER composites with good fluorescence properties and fluorescent stability, which have potential application in optoelectronic devices such as light-emitting diode and perovskite solar cells. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45935.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 22
·
IF 1.768
Junjie Yuan,He Qian
The film-forming polyacrylate/silica core–shell nanocomposite particles with octamethylcyclotetrasiloxane (D 4 ) were successfully synthesized via aqueous emulsion polymerization in the presence of a glycerol-functionalized nano silica sol. The ring-opening polymerization of D 4 and the reaction with the glycerol-functionalized nano silica particles before emulsion polymerization was the key procedure in this process. Transmission electron microscopy results showed that more nano silica particles tended to coat on the polyacrylate particles surface after the nano silica sols were modified with D 4 . The silica aggregation efficiency was increased from 90.9 to 98.6% when the amount of D 4 used in the system was varied from 0 to 8.0 wt %. The transparency of the nanocomposite films was not compromised after D 4 was incorporated into the system. The films of the nanocomposite particles with or without D 4 both exhibited superior abrasive resistance. Furthermore, the water resistance and hydrophobicity of the films of these particles with D 4 were also improved significantly. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42003.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 25
·50601
·
IF 3.125
Wenlong Qin,Ruixuan Li,Hanxi Li,Guanfeng Jiang,Guowei Qin,Yang Wang,Jiang Yang
A Fe 3 O 4 nonaparticles coated with acrylamide/2-acrylamido-2-methyl-1-propanesulfonic acid copolymer(Fe 3 O 4 -Polymer NPs) was synthesized by emulsion polymerization. The structure of Fe 3 O 4 -Polymer NPs was then characterized by infrared spectroscopy, thermo-gravimetric analysis, and scanning electron microscopy. Meanwhile, the rheological properties of Fe 3 O 4 -Polymer NPs solution were systematically studied. The results showed that when dosage of hydrophobic Fe 3 O 4 -Oleic NPs is 10%, the synthesized Fe 3 O 4 -Polymer NPs was with the best viscosity enhancement performance, and the maximum saturation magnetization could reach to 20.0 emu/g. The apparent viscosity value of 5000 mg/L magnetic nano-composite solution was 154.6 mPa·s at 30°C. It shows strong viscosity enhancement ability and good temperature performance. Hence, it has great application potential in well stimulation of medium and high temperature oil and gas reservoirs.
研究领域:
材料科学
·
石油工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 17
·48617
·
IF 2.188
Bing Yang,Yu Zhou,Hongxiang Chen,Song Zhang,Jingyi Liu
In order to improve the dispersity and stability of nano-SiO 2 aqueous system with high solid content, acrylic acid/allyloxy polyethylene glycol copolymer dispersants with methoxysilicon end groups (KH590-AA x -APEG y ) were synthesized by photopolymerization. After adding KH590-AA x -APEG y into the nano-SiO 2 aqueous system, the viscosity, the curing time, the particle size, and the zeta potential of these systems were respectively measured. The results showed that introducing polyethylene glycol chain into the dispersant was beneficial to better exerting its electrostatic repulsion and steric hindrance effects and further improving the dispersibility of the nano-SiO 2 aqueous system. Moreover, the dispersion stability of SiO 2 nanoparticles in water was closely related to the composition, the molecular weight, and the addition amount of KH590-AA x -APEG y and the solid content. When the molecular weight of KH590-AA x -APEG y was 3200 g mol −1 and its addition amount was 0.1 wt %, the nano-SiO 2 aqueous system with 20 wt % solid content showed the best dispersity and stability. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48617.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 33
·50822
·
IF 3.125
Xing Zhou,Yonghua Song,Dong Wang,Changqing Fang,Li Xie,Taiping Yao,Xin Zhang,Jiawei Zhang
Modification is mostly used to adjust and increase the performance of polymers by employing organic or inorganic fillers in composites. It is significant to investigate the functions of different fillers in polymer matrix. In this work, we prepared a series of composites by using polyurethane/acrylic dispersions as polymer matrix and nanofillers (cellulose nanocrystals, carbon nanotubes and aluminum oxide nanoparticles) as modifiers to study their micro-structure and applied performance. It is found that the different nanofillers can be dispersed in PUA homogenously, which are inclusive physically. Different nanofillers have a noticeable influence on the T g for the acrylate copolymers and the T g of the interphase between the acrylate and polyurethane. The CNTs significantly increases the elongation to 127.29%, and gives the highest dielectric response. We imply that the CNTs may be the most significant fillers to increase the mechanical and electrical properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 9
·47132
·
IF 1.901
X. Qi,W. Wang,J. Zhang,C. Yan,Y. Zhu,F. Zhang
A series of novel aqueously soluble semi-aromatic (co)polyamides, poly[(ethylenedioxy)bis(ethylene) terephthalamide]- ran -poly[(ethylenedioxy)bis(ethylene) (2,5-dihydroxy-3,6-diallyl)terephthalamide] (CRPAOT-x), were prepared via the solid-state Claisen rearrangement reaction of poly[(ethylenedioxy)bis(ethylene) terephthalamide]- ran -poly[(ethylenedioxy)bis(ethylene) 2,5-bis(allyloxy)terephthalamide] (APAOT-x), where x (= 0, 13, 25, 50, 75, and 100) represents the molar fraction of allyloxy containing unit. APAOT-x was obtained through the interfacial copolymerization of terephthaloyl chloride, 2,5-bis(allyloxy)terephthaloyl chloride, and 2,2′-(ethylenedioxy)bis(ethylamine). The reaction conditions including reactant concentration, temperature, and solvent were optimized. The chemical structures of the target (co)polyamides and their precursors were characterized by proton nuclear magnetic resonance ( 1 H NMR) and Fourier transform infrared spectroscopies. The incorporation of hydrophilic (ethylenedioxy)bis(ethylene) units greatly improved the polymer solubility. CRPAOT-x dissolved not only in polar organic solvents such as dimethylformamide, dimethyl sulfoxide, and N-methyl pyrrolidone but also in ammonia water. Due to the presence of hydroxyl groups and oxygen-rich aliphatic units, CRPAOT-x showed excellent affinity toward epoxy resins. The microbond test indicated that the aramid fibers sized by these dual-functional polymers exhibited remarkably enhanced interfacial shear strength in epoxy matrices. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47132.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 43
·e53059
·
IF 3.057
Kunyan Wang,Hongtao Zhu,Shaobin Zheng,Yuhua Guo,Peisong Tang,Yangbin Ding,Wenzhi Jia,Guoxiang Pan,Qipeng Guo
The overall target of this research was to design a dual-exterior surface chemical modification of eco-friendly layered double hydroxides (LDH-S@PA) using calcium stearate and phytic acid (PA) containing-rich phosphorus to synchronously boost the dispersibility in the polymer matrix and the flame retardancy. Microstructure, surface chemical environments and morphologies of LDH-S@PA were characterized. It was found that the target product with the hydrophobic surface was successfully prepared. The basic morphologies of LDH-S@PA exhibited thin flat crystals composed of multi-sheet with hexagonally arranged spots. Meanwhile, the thermal stability of LDH-S@PA was improved. Significantly, after adding LDH-S@PA into biobased poly(trimethylene terephthalate) (PTT) via melting-blending, LDH-S@PA exhibited a higher dispersity in the PTT matrix and the PTT/LDH-S@PA composite with 20 wt% loading achieved 29.8% limiting oxygen index value and possessed V-0 rating in UL-94 test, revealing LDH-S@PA dramatically enhanced the flame retardancy of the PTT. The flame retarded mechanism of LDH-S@PA in PTT was discussed based on gaseous and condensed phase analysis. In addition, the incorporation of LDH-S@PA improved the mechanical properties of the composites. This facile and straightforward approach for dual-surface modification LDHs holds promise as flame retardant formulations for polymer in future applications.
研究领域:
材料科学
·
聚合物工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）