JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52224
·
IF 3.057
Chuangchuang Sun,Wei Zhang,Yihua Cui,Dongyue Liu
A phosphazene-triazine bi-base sulfonate compound (CPNS) was synthesized using hexachlorocyclotriphosphazene, cyanuric chloride, and sodium p-hydroxybenzene sulfonate as raw materials. The chemical structure was determined by FTIR, 1 H NMR 31 P NMR (NMR stands for nuclear magnetic resonance), and elemental analysis of P, Na. To study the flame retardant properties of CPNS, a series of modified polycarbonate (MPC) with different ratios of CPNS were prepared. The flame retardant performance and thermal stability of CPNS/MPC were characterized by limiting oxygen index (LOI), UL-94 vertical burning test, cone calorimetry test, and TG. Results show that when CPNS is added to 0.3%, the CPNS/MPC can pass the UL94 V-0 level with an LOI value of 35.3% and reduce the peak heat release rate by 16.89% during the combustion. TG results show that adding 0.1% CPNS can decrease the initial decomposition temperature of the MPC by 68°C in nitrogen and 27°C in air. The reduction of the initial decomposition temperature means that the flame retardant promotes the isomerization reaction of polycarbonate accelerates the formation of an intermediate char on the surface. Investigation of intermediate char residue's morphology and chemical structure demonstrates that CPNS promotes the formation of more complete and compact char residue, which acts not only there is increased opportunity for radical recombination reactions in the condensed phase but also as physical barriers to inhibit the transfer of heat and oxygen, resulting in good flame retardant properties.
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
·
2020
·Vol. 137
·期 45
·49413
·
IF 2.52
Ziyue Yang,Dongcheng Sun
A facile method for preparing supramolecular waterborne polyurethane (WPU) based on quadruple hydrogen bonds (4H-WPU) is reported. Herein, 4H-WPU with quadruple hydrogen bonds in main chain were synthesized by poly (1,4-buthylene-neopentylene adipate glycol) as soft segment, 2-ureido-4[1H]-pyrimidinone (UPy) functionalized monomer, isophorone diisocyanate, 2,2-Bis(hydroxymethyl)propionic acid (hydrophilic monomer), isophorondiamine, triethylamine (neutralizer), and monoethanolamine (blocking agent) as hard segment. The molecular weight of 4H-WPU was controlled around 18,000 consistently. The properties of 4H-WPU with different content of hydrophilic group, hard segment, and UPy units were characterized and the results could provide the reference for preparing supramolecular WPU with high mechanical and self-healing performance while maintaining dispersion stability. The tensile strength of 4H-WPU was 10 times of the blank sample. The healing time of scratched 4H-WPU film was inversely proportional to the content of UPy- functionalized monomer and the shortest healing time is 2.5 hr at 80°C. Mechanical performance of healed films can be restored to more than 90%.
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
·
2022
·Vol. 139
·期 29
·e52648
·
IF 3.057
Zhonglan Cui,Yan Zhang,Chenkai Zhu,Lixiang Song,Jicheng Wang,Qianhong Jin,Qunchao Su,Dongming Qi
The dispersion and orientation arrangement of functional polymers with fillers are critical to their performance. However, there are rare detailed researches on the visualization of the orientation process about functional fillers in composite melts and the mechanistic effects on performance. In this work, it explored the change process of the orientation morphology for polyacrylate/silica (PAcr/SiO 2 ) composite microspheres in polymethyl methacrylate (PMMA) at different melting temperatures. Afterwards, the morphology and distribution of oriented microfibers in composite fibers melted at different temperatures were observed by transmission electron microscope (TEM). The results showed that composite microfibers could be formed in tight arrangement and obtained average orientation of 50.88 in the composite fibers at 250°C. Under this circumstance, the addition of nano SiO 2 particles had no effect on the rheological type. Meanwhile, the shear stress was 99.29% higher than that of pure PMMA system under the same conditions. As for the elongation at break, it was found that the elongation at break of the composite fiber prepared at 250°C was 169.43% higher than that of pure PMMA. Therefore, it provided a new method to achieve well dispersion of functional fillers in molten systems. Furthermore, it was beneficial to enhance the elongation at break of functional composites.
研究领域:
材料科学
·
高分子科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 6
·51625
·
IF 3.125
Yingshi Zhao,Qinyong Song,Yuebin Lin,Feng Chu,Yanchun Wei,Sen Liu,Changjiang Pan,Li Quan,Yiqing Wang
Fluorescein is a traditional organic fluorescent dye that has the disadvantage of agglomeration-induced fluorescence quenching and photobleaching due to its large hydrophobic conjugate π-π system, which makes them have limitations in many fields of application. A method of polymer modification is revealed to address this issue. In this study, fluorescein molecules were modified by polycaprolactone (PCL) to obtain PCL grafting fluorescein (P x F), and subsequently assembled with PEG-PCL to obtain fluorescent nanoparticles (PPxF). PPxF would realize long term cellular fluorescence imaging. PCL polymerization induces self-assembly, which effectively avoids fluorescence quenching caused by fluorescent molecules aggregation, and at the same time well inhibit the energy transfer with oxygen to improve photostability. This method is a good way to improve the fluorescence properties of fluorescent dyes, to be suitable for all traditional organic fluorescent dyes to greatly improve their fluorescence and hydrophilic properties and enhance their application fields.
研究领域:
生物材料学
·
分子生物学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51925
·
IF 3.125
Chunhui Luo,Min Huang,Hongmin Liu
Conductive hydrogels have drawn increasing attention, but their applications are severely hindered due to insufficient sensitivities at tiny strains and poor recovery ratio upon external loads. Herein, a poly(vinyl alcohol)/aluminum sulfate composite hydrogel (T-PVA-Al) was designed to address this issue by introducing aluminum sulfate into poly(vinyl alcohol) aqueous solution, followed with three freezing–thawing cycles. The triply dynamic knots (hydrogen bonds, crystalline regions, and coordination interactions) worked in tandem to achieve high resilience (94% recovery ratio after 100 cycles) and fatigue resistance. Remarkably, the introduction of the immobile Al 3+ cation and free sulfate (SO 4 2− ) anion endowed the T-PVA-Al hydrogel with outstanding sensitivity (a gauge factor=13.9, at 0.2% strain). It could precisely and quickly monitor external stress as low as 0.5 kPa, superior to most conductive hydrogels. Notably, the hydrogel sensor possessed the capacity to precisely and reliably detect subtle variations, for example, gentle finger touching, making it an ideal candidate for human-motion detections, artificial skins, and wearable devices.
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
·
2022
·Vol. 139
·期 23
·52322
·
IF 3.057
Yangyang Luo,Mali Xie,Jingxia Zheng,Linjun Shao,Chenze Qi,Yijun Du,Shujing Zhou,Jinjing Li
Polydopamine has been considered as the adhesive of mussels to solid surfaces in biological systems. The development of dopamine and polydopamine functionalized nanofibrous materials is highly desirable for catalysis, drug delivery and tissue engineering. Polydopamine induced surface functionalized solid matrices have been proved to be efficient supporting materials for palladium nanoparticles. In this study, the dopamine monomers were first incorporated into the Pd 2+ /chlorated poly(vinyl chloride) (CPVC) composite nanofibers by electrospinning and then polymerized in basic and reductive solution at elevated temperature to prepare stable polydopamine functionalized CPVC supported palladium composite nanofibers. Scanning electron microscopy images show that uniform and smooth nanofibers with diameter of ~325 nm have been prepared and high temperature can promote their solvent resistance. Fourier transformed infrared and UV–visible (UV–Vis) spectra confirmed the synthesis of polydopamine inside the composite nanofibers. The ultrafine palladium nanoparticles inside the composite nanofibers were characterized by X-ray spectroscopy and transmission electron microscopy. Although these palladium nanoparticles were confined inside the nanofibers, they exhibited excellent catalytic efficiency for the Heck reactions of aryl iodides with alkenes. Moreover, this novel fibrous catalyst could be easily recovered by simple filtration and reused at least five times without obviously loss of initial catalytic activity. In all, we have developed a distinctive way for the synthesis of polydopamine functionalized polymeric materials for catalysis and other applications.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 44
·e53077
·
IF 3.057
Ying Li,Changdan Gong,Zhenzhong Hou,Wenying Zhou,Chao Liu,Longgui Peng,Yi Wu,Qin Shi,Qiwei Cheng
Flexible epoxy-dispersed liquid crystal membranes (EDLC- v membranes) with high thermal conductivity were successfully prepared by using of high voltage orientation molding. Liquid crystal monomer (LCM) was uniformly dispersed into flexible epoxy polymers cured by trimethylolpropane tris(3-mercaptopropionate) (TTMP) or pentaerythritol tetra(3-mercaptopropionate) (PETMP). In-plane thermal conductivity (TC // ) of EDLC- v membranes reached to 1.47 W m −1 K −1 with LCM content of 30 wt%, which was 5.65 times higher than that of epoxy polymers without LCM (0.26 W m −1 K −1 ). In addition, the tensile strength and elongation at break of EDLC- v membranes were up to 27.9 MPa and 92.8%, respectively. The main reasons for high TC // and flexibility of EDLC- v membranes are molecular chains' ordered arrangement, crosslinking in epoxy polymers, hydrogen bond interaction, and high voltage orientation molding. This work provided a new and feasible way to prepare intrinsic high thermal conductive polymer materials, as well as flexible epoxy polymers.
研究领域:
材料科学
·
热传导工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 11
·50040
·
IF 2.52
Shupeng Zhang,Lei Zhang,Xiaodong Yang,Wendong Hua,Junyun Qiu,Mingqian Zhang,Bo Zhang,Tianrui Ren
Coalescence and flocculation are two challenges for the stability and efficacy of pesticide suspension concentrate (SC) during the production and storage. To improve the stability of 25% pymetrozine SC, three comb-like poly(styrene-co-acrylic acid-co-polyethylene glycol methyl ether maleate) (SA-M) with different length side chains were synthesized by free radical polymerization and characterized by Fourier transform infrared spectroscopy and H-nuclear magnetic resonance. Surface-active parameters, including critical aggregation concentration (critical micelle concentration), saturation surface excess concentration ( Γ max ), minimum area per molecule ( A min ), and standard Gibbs free energy values were obtained from surface tension measurement. It shows that the surface-active property of SA-M decreased with the side chain length. Besides, 25% pymetrozine SC prepared using SA-M as dispersant had low zeta potential and low viscosity but high dispersibility and thermal storage stability. It is speculated that the formation of hydrogen bonds between nonionic branches and pymetrozine molecule at the expense of interruption of intermolecular hydrogen bonding between pymetrozine and water molecule, plays a key role in the stability mechanism.
研究领域:
农药科学
·
高分子化学
·
表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Man Liu,Chuandong Shi,Hongmei Qin,Chuanxi Xiong,Quanling Yang
The demand for dielectric capacitor materials has significantly increased, owing to the need for highly efficient operation at elevated temperatures amidst the rapid advancements in modern electronics. In this contest, fluorinated polyimide (FPI)/CaCu 3 Ti 4 O 12 (CCTO) composite films have been successfully fabricated through a straightforward blending approach. The modified CCTO (mCCTO) is prepared by first hydroxylation CCTO and subsequently by grafting KH550 onto its surface, a strategy aimed at enhancing the interfacial compatibility with FPI. The synergistic effect of the high dielectric constant and good dispersibility of CCTO inorganic fillers underscores the significant role of filler dispersibility in enhancing the high-temperature capacitive performance of polymer composite materials. The dielectric constant of FPI-mCCTO composite films containing 9 wt.% mCCTO reached 8.5 at 150°C, more than double that of pure FPI (3.0). Furthermore, the FPI-0.09-mCCTO composite films exhibited the highest discharge energy density of 4.92 J·cm −3 at 355 MV·m −1 . This facile approach provided a viable strategy for fabricating high-temperature dielectric materials for electrical energy storage.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 22
·50525
·
IF 3.125
Songyi Li,Yihua Cui,Jingjing Li
In order to lower the volume shrinkage of the DLP 3D printing photosensitive resins during printing, a thiol-terminated hyperbranched polymer (T-HBP) was synthesized and introduced into the bisphenol A epoxy acrylate (EA) based photosensitive resin system. The obtained T-HBP was characterized by FTIR and 1 H NMR spectra, and the grafting rate of sulfhydryl was determined. The mechanical properties of the photosensitive resins were measured by tensile and impact strength measurement. The glass transition temperature of the photosensitive resins was analyzed by DSC and the impact fracture surface was observed by SEM. T-HBP exhibited a much lower viscosity than its linear counterparts, and the addition of thiol improved the curing speed of the photosensitive resins. When the amount of T-HBP added was 20 wt%, the shrinkage of the photosensitive resins was reduced by about 45.5% and the impact strength increased by 33.9% compared with the control. The macromolecular spherical structure of T-HBP effectively reduced the functional group density of the photosensitive resins. In addition, the thiol-acrylate photopolymerization introduced by T-HBP further reduced the volume shrinkage of the photosensitive resins.
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
·
2022
·Vol. 139
·期 29
·e52647
·
IF 3.057
Jinrong Yin,Yunlei Gong,Huaan Zheng,Hui Yuan,Zhen Zeng,Wei Qin,Chenghao Li,Yang Zhou,Xianyan Ren
Ultra-low-density proppants are of great significant in slick water fracturing system, but the polymer composite microspheres can hardly promise the quality of oil and gas due to their poor hydrophobicity. To address the issue, we prepared several types of modified styrene-divinyl benzene copolymer microspheres (MSDBs) with long-term durable hydrophobicity and high strength, including O-MSDBs (hydrophobic MSDBs), LO-MSDBs (long-time hydrophobic MSDBs), and CO-MSDBs (coated O-MSDBs) on the basis of a molecular structure of “KH570-styrene (St)-divinyl benzene (DVB)” copolymer. In this article, the design concept and the structure of MSDBs was clarified, and performances of MSDBs are systematically discussed and compared with commercially available hydrophobic microspheres. The O-MSDBs, a kind of nanoparticle patterned St-DVB copolymer microspheres, were prepared by a one-step suspension polymerization undergoing a sol–gel process, showing strong hydrophobicity with a water contact angle up to 140.7°, but short durability in strong hydrochloric acid or hydrofluoric acid; On the contrary, LO-MSDBs perform better in the stability and durability of hydrophobicity with a slightly lower water contact angle about 135.9°. The LO-MSDBs were designed by coating functionalized St-DVB copolymer microspheres with fluororesin. Similarly, CO-MSDBs from fluororesin-coated O-MSDBs were designed. As expected, CO-MSDBs have a stronger hydrophobicity (139.0°) than LO-MSDBs and longer durability than O-MSDBs. Moreover, the MSDBs exhibit better properties than the commercially available hydrophobic polymer and ceramic microspheres.
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
·
2024
·Vol. 141
·期 27
·e55602
·
IF 2.7
Zhenjie Gan,Shuxiu Ma,Yinlong Zhang,Yuzhou Wang,Wenbo Liu,Jiliang Cao,Na Li
Both hydrophobic and hydrophilic pollutions have damage on our environment, and it is necessary to remove them. However, the treatments for different water pollutions can be specific due to the hydrophobicity of various molecules. Therefore, it is important to separate pollutants with different hydrophobicity. In this work, we developed a diffusion separation method based on hydrophobicity selectivity polymer membranes, whose selectivity between hydrophilic and hydrophobic pollutants can be up to more than 100. By doping pH-responsive monomer into hydrophobic polymer membrane, the permeability of membrane can be tuned by surrounding pH, and the selectivity is not decreasing. With the results of characteristics on contact angle, scanning electron microscope, and mechanical properties, we prove the stimuli-responsive polymer membrane at different states have similar properties with the nonresponsive amorphous polymer membranes with high separation selectivity.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
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