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Preparation of HTV silicone rubber with hydrophobic–uvioresistant composite coating and the aging research 带有疏水-抗紫外线复合涂层的 HTV 硅橡胶的制备与老化研究
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-04-08 DOI: 10.1515/epoly-2023-0159
Mingdong Lei, Ziyou Li, Qiang Gan, Weizhen Zhou, Qiang Li
A series of high temperature vulcanization (HTV) silicone rubbers with TiO2 ultraviolet (UV) shielding layer and polytetrafluoroethylene (PTFE) hydrophobic layer were prepared via stepwise spray method. It was found that the hydrophobic PTFE liquid emulsion (PTFEL) could steadily and tightly adhere to the HTV silicone rubber surface by spray method after pre-mixing with permanent room temperature vulcanized (PRTV) silicone rubber during the first step spray. And the subsequent introduction of TiO2 and PTEF solid powder (PTFES) could improve the UV shielding ability and further increase the hydrophobicity of HTV silicone rubber during the second step spray after pre-blending. The accelerated hygrothermal aging process and UV aging process were used to analyze the effect of coating structure and composition on anti-aging performance. And the results indicated that the HTV silicone rubber with PRTV-PTFEL/TiO2-PTFES composite coating showed a favorable UV shielding ability and also possessed an excellent hydrophobicity due to the introduction of low surface energy matter and the building of coarse micro-nano hydrophobic structure. After the aging process, the cracked micro-surface, increased water absorption and decreased mechanical property were displayed for the neat HTV silicone rubber, and these aging phenomena got dramatically improved for PRTV-PTFEL/TiO2-PTFES coating HTV silicone rubber.
通过分步喷雾法制备了一系列带有 TiO2 紫外线(UV)屏蔽层和聚四氟乙烯(PTFE)疏水层的高温硫化(HTV)硅橡胶。研究发现,在第一步喷涂过程中,疏水性聚四氟乙烯液体乳液(PTFEL)与永久室温硫化(PRTV)硅橡胶预混合后,可通过喷涂方法稳定、紧密地附着在 HTV 硅橡胶表面。在预混合后的第二步喷涂过程中,TiO2 和 PTEF 固体粉末(PTFES)的加入可提高 HTV 硅橡胶的紫外线屏蔽能力,并进一步增加其疏水性。通过加速湿热老化过程和紫外老化过程分析涂层结构和组成对抗老化性能的影响。结果表明,PRTV-PTFEL/TiO2-PTFES 复合涂层的 HTV 硅橡胶具有良好的紫外线屏蔽能力,同时由于低表面能物质的引入和粗微纳米疏水结构的构建,使其具有优异的疏水性。在老化过程中,纯 HTV 硅橡胶出现了微表面开裂、吸水性增加和机械性能下降的现象,而 PRTV-PTFEL/TiO2-PTFES 涂层 HTV 硅橡胶的这些老化现象得到了显著改善。
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引用次数: 0
Mesoscale mechanics investigation of multi-component solid propellant systems 多组分固体推进剂系统的中尺度力学研究
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-04-04 DOI: 10.1515/epoly-2024-0006
Lipeng Zhang, Chen Chen, Xianqiong Tang, Xing Zhou
To enhance the mechanical properties of the Nitrate Ester Plasticized Polyether solid propellant matrix, the uniaxial tension of multi-component systems is simulated and the factors influencing the mechanical properties of the propellant matrix are investigated. First, mesoscale models of five types of systems include poly alpha olefin (PAO(3)), polyethylene glycol (PEG200, PEG400, PEG600), and 1,4-butanediol (BDO) are established, followed by uniaxial tensile simulations. The results show PEG600, PEG400, PEG200, BDO, and PAO(3) in order of enhancing the mechanical performance of the matrix. Second, the diffusion behavior of nitroglycerin (NG) and butanetriol trinitrate (BTTN) in various systems is investigated. The results show that NG exhibits higher diffusion capacity than BTTN, and the diffusion coefficient increases with an increment in the molecular weight of PEG. Additionally, the influence of different plasticizer ratios (2.8–3.0), curing parameters (1.58–1.62), and chain extension parameters (0.08–0.10) on the mechanical properties of the PEG600 system are investigated. The results demonstrate that as the plasticizer ratio increases, there is a gradual decrease in the modulus of the matrix. Additionally, an increase in the curing parameter leads to a substantial enhancement in the tensile strength of the matrix, while increasing the chain extension parameter significantly expands the maximum tensile length of the matrix. Finally, employing the Slip-Spring model, the effects of the physical and chemical cross-linked network of the propellant are simulated. The result shows that increasing the content of a chemical cross-linked network significantly improves the tensile strength of the matrix.
为了提高硝酸酯塑化聚醚固体推进剂基体的力学性能,模拟了多组分体系的单轴拉伸,并研究了影响推进剂基体力学性能的因素。首先建立了包括聚α-烯烃(PAO(3))、聚乙二醇(PEG200、PEG400、PEG600)和 1,4-丁二醇(BDO)在内的五种体系的中尺度模型,然后进行了单轴拉伸模拟。结果表明,PEG600、PEG400、PEG200、BDO 和 PAO(3) 依次提高了基体的机械性能。其次,研究了硝化甘油(NG)和丁三醇三硝酸酯(BTTN)在不同体系中的扩散行为。结果表明,硝化甘油的扩散能力高于 BTTN,且扩散系数随 PEG 分子量的增加而增大。此外,还研究了不同增塑剂比率(2.8-3.0)、固化参数(1.58-1.62)和延链参数(0.08-0.10)对 PEG600 体系机械性能的影响。结果表明,随着增塑剂比率的增加,基体的模量逐渐降低。此外,固化参数的增加会大幅提高基体的拉伸强度,而链延伸参数的增加会显著扩大基体的最大拉伸长度。最后,利用 Slip-Spring 模型模拟了推进剂物理和化学交联网络的影响。结果表明,增加化学交联网络的含量可显著提高基体的拉伸强度。
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引用次数: 0
Assessing the recycling potential of thermosetting polymer waste in high-density polyethylene composites for safety helmet applications 评估安全头盔用高密度聚乙烯复合材料中热固性聚合物废料的回收潜力
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-04-04 DOI: 10.1515/epoly-2023-0080
Diwahar Periasamy, Prakalathan Karuppiah, Bharathi Manoharan, Felix Sahayaraj Arockiasamy, Sathish Kannan, Vinayagam Mohanavel, Palanivel Velmurugan, Natarajan Arumugam, Abdulrahman I. Almansour, Subpiramaniyam Sivakumar
The rising demand for thermosetting polymers has resulted in the production of large amounts of industrial waste. Environmental issues due to waste landfills and increased raw material costs for new product development have led to the development of innovative recycling methods. This study focuses on the development of a product (helmet shell) by reinforcing thermosetting polymer waste (TPW) as a filler in a high-density polyethylene (HDPE) matrix. The HDPE and TPW were converted into extrudates using a twin-screw extruder. Then, the extrudate was pelletized to use as raw material for the injection molding machine. The HDPE/TPW composites were fabricated using injection molding. Maleic anhydride-grafted polyethylene was employed as a compatibilizer. In the composite, the TPW volume was reinforced at various weight percentages, ranging from 0 to 35 wt%. The mechanical, thermal, and viscoelastic properties of the composites can be enhanced by uniformly dispersing TPW in the HDPE matrix. However, it is difficult to achieve uniform dispersion at higher TPW volumes owing to the agglomeration effect. According to these findings, the mechanical properties were enhanced by up to 30 wt% addition of TPW. The findings suggest that the proposed composite has sufficient mechanical properties to be suitable for the fabrication of helmet shells.
热固性聚合物需求的不断增长导致产生了大量的工业废物。废物填埋带来的环境问题以及新产品开发所需的原材料成本增加,促使人们开发创新的回收方法。本研究的重点是通过在高密度聚乙烯(HDPE)基体中添加热固性聚合物废料(TPW)作为填料,开发一种产品(头盔外壳)。使用双螺杆挤压机将高密度聚乙烯和 TPW 转化为挤出物。然后,将挤出物造粒,用作注塑机的原材料。高密度聚乙烯/热塑性硫化弹性体复合材料是用注射成型法制造的。马来酸酐接枝聚乙烯被用作相容剂。在复合材料中,TPW 体积以不同的重量百分比被增强,从 0 到 35 wt%。通过在高密度聚乙烯基体中均匀分散 TPW,可以增强复合材料的机械、热和粘弹性能。然而,由于团聚效应,在 TPW 体积较大时很难实现均匀分散。根据这些研究结果,TPW 的添加量最高可达 30 wt%,从而提高了机械性能。研究结果表明,所提议的复合材料具有足够的机械性能,适合用于头盔外壳的制造。
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引用次数: 0
Impact of ionic liquids on the thermal properties of polymer composites 离子液体对聚合物复合材料热性能的影响
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-04-02 DOI: 10.1515/epoly-2024-0020
Ahmad Adlie Shamsuri, Khalina Abdan, Mohd Zuhri Mohamed Yusoff, Siti Nurul Ain Md. Jamil
The integration of ionic liquids and polymer composites has become a promising way to improve their thermal properties, representing a notable advancement in the development of advanced materials for specific applications. Their thermal properties heavily influence the suitability of polymer composites for particular applications. It is imperative to understand and manipulate the thermal behavior of these composites to optimize their performance across various fields. In this mini-review, diverse polymer matrices and fillers utilized in polymer composites containing ionic liquids are categorized. Additionally, various ionic liquids employed in studies related to the thermal properties of polymer composites are identified. The impact of ionic liquids on the thermal properties of these composites is also briefly reviewed. The knowledge illustrated in this review enriches the understanding of the types of polymer matrices and fillers used in conjunction with ionic liquids, as well as their thermal properties. In a nutshell, imidazolium-based ionic liquids with tetrafluoroborate, bis(trifluoromethylsulfonyl)imide, hexafluorophosphate, halides, and hydrogen sulfate anions have the impact of improving the glass transition temperature, melting temperature, degradation temperature, and thermal conductivity of thermoplastic, thermosetting, and elastomer composites.
离子液体与聚合物复合材料的结合已成为改善其热学特性的一种很有前途的方法,代表了为特定应用开发先进材料方面的显著进步。离子液体的热性能在很大程度上影响着聚合物复合材料在特定应用中的适用性。当务之急是了解并控制这些复合材料的热行为,以优化其在各个领域的性能。在这篇微型综述中,对含有离子液体的聚合物复合材料中使用的各种聚合物基材和填料进行了分类。此外,还介绍了在聚合物复合材料热性能相关研究中使用的各种离子液体。还简要回顾了离子液体对这些复合材料热性能的影响。本综述介绍的知识丰富了人们对与离子液体结合使用的聚合物基材和填料类型及其热性能的了解。简而言之,含有四氟硼酸盐、双(三氟甲基磺酰基)亚胺、六氟磷酸盐、卤化物和硫酸氢阴离子的咪唑基离子液体可改善热塑性、热固性和弹性体复合材料的玻璃化转变温度、熔化温度、降解温度和导热性能。
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引用次数: 0
Preparation and application research of composites with low vacuum outgassing and excellent electromagnetic sealing performance 低真空放气和优异电磁密封性能复合材料的制备与应用研究
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-04-02 DOI: 10.1515/epoly-2024-0018
Hongda Mao, Hua Zou, Wei Liu, Xindi Zhuang, Baotong Xing
Electromagnetic interference (EMI) shielding rubber effectively fills gaps in electronic devices to prevent electromagnetic (EM) leakage. However, research on the potential application of EMI shielding rubber in the field of space is limited. This study explores the optimal amount of silver-coated aluminum powder (SCA) in SCA/ methyl vinyl silicone rubber (MVQ) composites to balance the electrical and mechanical properties of EMI shielding rubber. The EMI shielding effectiveness (SE) of 41.8 vol% SCA/MVQ composite exceeded 90 dB in the frequency range between 100 and 1,200 MHz with a compression set of only 14%. To address the outgassing characteristics of silicone rubber in a vacuum environment, both pre-heating and post-heating treatments for reducing rubber volatility are explored, proving that silicone rubber followed by 4 h of post-heating treatment at 200°C, is an appropriate solution to reduce silicone rubber volatility, leading to the SCA/MVQ composite with a total mass loss of only 0.2%, and a collected volatile condensable material of only 0.02%. In addition, high reliability is crucial for EMI shielding materials. SCA/MVQ composite exhibits excellent adaptability to vacuum temperature cycles, with the EMI SE maintained at 90 dB after cycles. At room temperature, after 30 days of storage, the EMI SE of the composite remains at 90 dB. These findings indicate that SCA/MVQ composites exhibit broad potential applications in the field of EM sealing for aerospace electronic devices.
电磁干扰(EMI)屏蔽橡胶可有效填补电子设备的缝隙,防止电磁泄漏。然而,有关 EMI 屏蔽橡胶在太空领域潜在应用的研究还很有限。本研究探讨了 SCA/甲基乙烯基硅橡胶(MVQ)复合材料中银涂层铝粉(SCA)的最佳用量,以平衡 EMI 屏蔽橡胶的电气和机械性能。41.8 vol% SCA/MVQ 复合材料的 EMI 屏蔽效果 (SE) 在 100 至 1,200 MHz 的频率范围内超过 90 dB,压缩率仅为 14%。为了解决硅橡胶在真空环境中的放气特性问题,研究人员探索了预热和后热处理以降低橡胶挥发性,结果证明,硅橡胶在 200°C 下经过 4 小时后热处理是降低硅橡胶挥发性的适当解决方案,从而使 SCA/MVQ 复合材料的总质量损失仅为 0.2%,收集的挥发性可凝结物质仅为 0.02%。此外,高可靠性对于 EMI 屏蔽材料也至关重要。SCA/MVQ 复合材料对真空温度循环的适应性极佳,循环后的 EMI SE 保持在 90 dB。在室温下存放 30 天后,复合材料的 EMI SE 仍保持在 90 dB。这些研究结果表明,SCA/MVQ 复合材料在航空航天电子设备的电磁密封领域具有广泛的应用潜力。
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引用次数: 0
Experimental investigation on damage mechanism of GFRP laminates embedded with/without steel wire mesh under low-velocity-impact and post-impact tensile loading 嵌入/未嵌入钢丝网的 GFRP 层压板在低速冲击和冲击后拉伸加载下的损伤机理实验研究
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-04-02 DOI: 10.1515/epoly-2024-0002
Ye Wu, Peiyu You, Wuchao Hua, Cuilong Liu, Shuaimin Zhang, Youping Liu
To investigate the impact behavior and residual strength of glass fiber-reinforced polymer (GFRP) laminates embedded with/without steel wire mesh, low-velocity-impact (LVI) and post-impact tensile tests are conducted carefully. According to the wire diameter and spacing of steel wire mesh, we manufactured two groups of specimens via conventional vacuum-assisted resin infusion. Further, the digital image correlation technique was applied to record the strain evolution. Based on the results, including impact response history, failure morphology, strain contour, the failure mechanism and effect of the parameters of steel wire mesh is revealed in detail. The results show that the embedding of wire mesh can improve the impact resistance and residual strength, with a more significant effect as both the increase of wire diameter and decrease of wire spacing. Compared with GFRP laminates, the peak force of specimens with the thickest and densest wire mesh increase by 105% and 141% under LVI tests and 254% and 141% in post-impact tensile tests, respectively.
为了研究嵌入/未嵌入钢丝网的玻璃纤维增强聚合物(GFRP)层压板的冲击行为和残余强度,我们仔细进行了低速冲击(LVI)和冲击后拉伸试验。根据钢丝网的丝径和间距,我们采用传统的真空辅助树脂灌注法制作了两组试样。然后,采用数字图像相关技术记录应变演变。根据结果,包括冲击响应历史、破坏形态、应变轮廓,详细揭示了钢丝网的破坏机制和参数影响。结果表明,钢丝网的嵌入可以提高抗冲击性能和残余强度,随着钢丝直径的增大和钢丝间距的减小,效果更加显著。与 GFRP 层压板相比,最厚和最密钢丝网的试样在 LVI 试验中的峰值力分别增加了 105% 和 141%,在冲击后拉伸试验中分别增加了 254% 和 141%。
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引用次数: 0
A blue fluorescent waterborne polyurethane-based Zn(ii) complex with antibacterial activity 具有抗菌活性的蓝色荧光水性聚氨酯基 Zn(ii) 复合物
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-04-01 DOI: 10.1515/epoly-2023-0059
Xiang Luo, Yuqing Yang, Mingdi Yang, Kehua Zhang, Yuxi Xian, Ping Wang, Hongliang Xu, Xianhai Hu
Polymer-based transition metal complexes have attracted much attention in many fields of application. In this article, a fluorescent polymer-based transition metal complex was prepared by bonding the transition metal complex with the polymer. First, Schiff base salicylaldehyde ethanolamine (HL) as a ligand was prepared by the reaction of salicylaldehyde with ethanolamine. Then, salicylaldehyde glycolamine Zn(ii) transition metal complexes (ZnL2) were synthesized with HL and Zn2+ as the central ion. Finally, a blue fluorescent waterborne-based polyurethane Zn(ii) complex (ZnL2-WPU) with an antibacterial function was prepared with ZnL2 as a chain extender by modified acetone method. The characteristics of fluorescence, heat stability, and bacteriostasis were characterized. Compared with ZnL2, the UV–vis absorption peak of ZnL2-WPU shows a blue shift of about 20 nm. ZnL2-WPU has a strong blue fluorescence emission at 450 nm, and the intensity increases significantly with ZnL2 content. Surprisingly, the fluorescence lifetime of ZnL2-WPU is obviously increased, reaching more than one time that of ZnL2. Interestingly, the antibacterial efficiency of ZnL2-WPU against E. coli reached an incredible 99%. More importantly, ZnL2-WPU uses water as the dispersing medium, which is more environmentally friendly.
聚合物基过渡金属配合物在许多应用领域都备受关注。本文通过将过渡金属配合物与聚合物结合,制备了一种荧光聚合物基过渡金属配合物。首先,通过水杨醛与乙醇胺的反应制备了作为配体的席夫碱水杨醛乙醇胺(HL)。然后,以 HL 和 Zn2+ 为中心离子合成了水杨醛乙醇胺 Zn(ii) 过渡金属配合物(ZnL2)。最后,以 ZnL2 为扩链剂,采用改良丙酮法制备了具有抗菌功能的蓝色荧光水性聚氨酯 Zn(ii) 复合物(ZnL2-WPU)。对其荧光、热稳定性和抑菌性进行了表征。与 ZnL2 相比,ZnL2-WPU 的紫外可见吸收峰发生了约 20 nm 的蓝移。ZnL2-WPU 在 450 纳米波长处发出强烈的蓝色荧光,其强度随 ZnL2 含量的增加而显著增加。令人惊讶的是,ZnL2-WPU 的荧光寿命明显增加,达到 ZnL2 的 1 倍以上。有趣的是,ZnL2-WPU 对大肠杆菌的抗菌效率达到了惊人的 99%。更重要的是,ZnL2-WPU 使用水作为分散介质,更加环保。
{"title":"A blue fluorescent waterborne polyurethane-based Zn(ii) complex with antibacterial activity","authors":"Xiang Luo, Yuqing Yang, Mingdi Yang, Kehua Zhang, Yuxi Xian, Ping Wang, Hongliang Xu, Xianhai Hu","doi":"10.1515/epoly-2023-0059","DOIUrl":"https://doi.org/10.1515/epoly-2023-0059","url":null,"abstract":"Polymer-based transition metal complexes have attracted much attention in many fields of application. In this article, a fluorescent polymer-based transition metal complex was prepared by bonding the transition metal complex with the polymer. First, Schiff base salicylaldehyde ethanolamine (HL) as a ligand was prepared by the reaction of salicylaldehyde with ethanolamine. Then, salicylaldehyde glycolamine Zn(<jats:sc>ii</jats:sc>) transition metal complexes (ZnL<jats:sub>2</jats:sub>) were synthesized with HL and Zn<jats:sup>2+</jats:sup> as the central ion. Finally, a blue fluorescent waterborne-based polyurethane Zn(<jats:sc>ii</jats:sc>) complex (ZnL<jats:sub>2</jats:sub>-WPU) with an antibacterial function was prepared with ZnL<jats:sub>2</jats:sub> as a chain extender by modified acetone method. The characteristics of fluorescence, heat stability, and bacteriostasis were characterized. Compared with ZnL<jats:sub>2</jats:sub>, the UV–vis absorption peak of ZnL<jats:sub>2</jats:sub>-WPU shows a blue shift of about 20 nm. ZnL<jats:sub>2</jats:sub>-WPU has a strong blue fluorescence emission at 450 nm, and the intensity increases significantly with ZnL<jats:sub>2</jats:sub> content. Surprisingly, the fluorescence lifetime of ZnL<jats:sub>2</jats:sub>-WPU is obviously increased, reaching more than one time that of ZnL<jats:sub>2</jats:sub>. Interestingly, the antibacterial efficiency of ZnL<jats:sub>2</jats:sub>-WPU against <jats:italic>E. coli</jats:italic> reached an incredible 99%. More importantly, ZnL<jats:sub>2</jats:sub>-WPU uses water as the dispersing medium, which is more environmentally friendly.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"49 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140565686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cellulose acetate filter rods tuned by surface engineering modification for typical smoke components adsorption 通过表面工程改性调整醋酸纤维素过滤棒对典型烟雾成分的吸附能力
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-03-27 DOI: 10.1515/epoly-2023-0054
Zhi Huang, Hua Liu, Wenjie Zhou, Mengdie Cai, Kangzhong Shi, Ying Zhao, Lisheng Guo
A series of filter rods (FRs) with sodium alginate (SA) modification were prepared by a simple one-pot pre-treatment surface modification method for the retention of typical smoke components. The influences of SA on the physico-chemical properties and adsorption behaviors (or retention characteristics) toward FRs were investigated in detail. Based on the results of XRD, BET, and SEM, it can be inferred that SA modification has no influences on compositions and textural properties of FRs. However, surface modification of FR by SA can greatly improve the hydrophilicity of FR, which is crucial for water retention. In situ diffuse Fourier-transform infrared spectroscopy results demonstrate that FR modified by 2 g·L−1 SA presents superior adsorption character for acetone. The differences in the adsorption or retention of water and acetone are ascribed to surface enriched functional groups tuned by surface engineering modification. By contrast, the modification of SA had no obvious effect on the adsorption of CO at room temperature. By contrast, at high temperature, low modification concentration is conducive to the CO2 and CO adsorption. It presents a good perspective for the rational design of new filter materials to reduce the release of harmful components in cigarette smoke.
通过简单的一锅预处理表面改性方法制备了一系列具有海藻酸钠(SA)改性的滤棒(FRs),用于截留典型的烟雾成分。详细研究了海藻酸钠对滤棒物理化学性质和吸附行为(或截留特性)的影响。根据 XRD、BET 和 SEM 的结果,可以推断出 SA 改性对 FR 的成分和纹理特性没有影响。然而,用 SA 对玻璃纤维进行表面改性可以大大提高玻璃纤维的亲水性,而亲水性对保水至关重要。原位扩散傅立叶变换红外光谱分析结果表明,经 2 g-L-1 SA 改性的玻璃纤维对丙酮具有优异的吸附特性。水和丙酮在吸附或保留方面的差异可归因于表面工程改性所调整的表面富官能团。相比之下,SA 的改性在室温下对 CO 的吸附没有明显影响。相反,在高温条件下,低改性浓度有利于 CO2 和 CO 的吸附。这为合理设计新型过滤材料以减少香烟烟雾中有害成分的释放提供了一个良好的视角。
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引用次数: 0
Properties of kenaf fiber-reinforced polyamide 6 composites 槿麻纤维增强聚酰胺 6 复合材料的性能
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-03-26 DOI: 10.1515/epoly-2022-8112
Norihan Abdullah, Khalina Abdan, Muhammad Huzaifah Mohd Roslim, Mohd Nazren Radzuan, Ayu Rafiqah Shafi, Lee Ching Hao
Despite the increasing interest in polyamide-based composites, few studies on polyamide-based natural fiber composites have been conducted due to their high melting temperatures of polyamide 6 (PA6). In this study, kenaf fiber-reinforced polyamide 6 composites (KF/PA6) were successfully prepared and their properties were investigated. Thermogravimetric analysis demonstrated that the neat PA6 has higher thermal stability with higher melting temperatures of 426°C, respectively, than KF/PA6 composites. The results of the differential scanning calorimeter showed that the glass transition temperature (T g) of KF/PA6 composites was slightly shifted to a higher temperature at 59°C than that of the neat PA6 at 45°C. The thermal and mechanical characteristics using dynamic mechanical analysis results showed that the storage and loss modulus of the neat PA6 were higher than those of KF/PA6 composites. The neat PA6 showed the maximum tensile strength of 48 MPa; however, the maximum tensile modulus was obtained at 10 wt% KF with 2,100 MPa. The flexural strength and modulus of the neat PA6 were 91 and 2,506 MPa, respectively, which were higher than those of KF/PA6 composites. The impact strength also deteriorated with the addition of KF, from 3.72 to 1.91 kJ·m−2. Voids, fiber pulled-out, and agglomeration were observed in scanning electron microscope analysis on the tensile fractured surfaces.
尽管人们对聚酰胺基复合材料的兴趣与日俱增,但由于聚酰胺 6(PA6)的熔融温度较高,有关聚酰胺基天然纤维复合材料的研究却寥寥无几。本研究成功制备了剑麻纤维增强聚酰胺 6 复合材料(KF/PA6),并对其性能进行了研究。热重分析表明,与 KF/PA6 复合材料相比,纯 PA6 具有更高的热稳定性,熔化温度分别高达 426°C。差示扫描量热仪的结果表明,KF/PA6 复合材料的玻璃化转变温度(T g)略微偏高,为 59°C,高于纯 PA6 的 45°C。利用动态力学分析法进行的热和力学特性分析结果表明,纯 PA6 的储存模量和损失模量均高于 KF/PA6 复合材料。纯 PA6 的最大拉伸强度为 48 兆帕;然而,10 wt% KF 的最大拉伸模量为 2,100 兆帕。纯 PA6 的抗弯强度和模量分别为 91 和 2,506 兆帕,均高于 KF/PA6 复合材料。冲击强度也随着 KF 的添加而降低,从 3.72 kJ-m-2 降至 1.91 kJ-m-2。在拉伸断裂表面的扫描电子显微镜分析中观察到了空洞、纤维拔出和团聚现象。
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引用次数: 0
Simulation approach to study kinetic heterogeneity of gadolinium catalytic system in the 1,4-cis-polyisoprene production 模拟法研究钆催化体系在 1,4-顺式聚异戊二烯生产中的动力学异质性
IF 3.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-03-25 DOI: 10.1515/epoly-2023-0131
Eldar Miftakhov, Sofia Mustafina, Andrey Akimov, Svetlana Mustafina
This article presents a novel simulation approach for solving the inverse problem of kinetic heterogeneity in polymerization processes, specifically focusing on the production of polyisoprene using a gadolinium chloride solvate-based catalytic system. The proposed method is based on the assumption that the distribution of active centers (ACs) can be described by model distributions. By utilizing primary physicochemical data, such as the polymerization rate and molecular weight distribution, the simulation approach automatically identifies the kinetic parameters, determining the Frenkel statistical parameter and solving the problem of kinetic heterogeneity. The experimental results revealed the presence of at least three distinct types of ACs, each contributing different proportions to the polymerization process. The simulation approach offers valuable insights into the complexities of catalytic systems and their role in polymerization, paving the way for optimizing reaction conditions and advancing industrial polymer synthesis processes. This study marks a significant step forward in understanding and controlling polymerization reactions, with potential implications for the development of innovative materials and industrial applications.
本文介绍了一种解决聚合过程中动力学异质性逆问题的新型模拟方法,特别侧重于使用氯化钆溶胶催化系统生产聚异戊二烯的过程。所提出的方法基于活性中心(AC)的分布可以用模型分布来描述这一假设。通过利用聚合速率和分子量分布等主要理化数据,该模拟方法可自动识别动力学参数,确定 Frenkel 统计参数并解决动力学异质性问题。实验结果表明,聚合过程中至少存在三种不同类型的 AC,它们在聚合过程中所占的比例各不相同。模拟方法为了解催化系统的复杂性及其在聚合过程中的作用提供了宝贵的见解,为优化反应条件和推进工业聚合物合成工艺铺平了道路。这项研究标志着在理解和控制聚合反应方面迈出了重要一步,对创新材料的开发和工业应用具有潜在影响。
{"title":"Simulation approach to study kinetic heterogeneity of gadolinium catalytic system in the 1,4-cis-polyisoprene production","authors":"Eldar Miftakhov, Sofia Mustafina, Andrey Akimov, Svetlana Mustafina","doi":"10.1515/epoly-2023-0131","DOIUrl":"https://doi.org/10.1515/epoly-2023-0131","url":null,"abstract":"This article presents a novel simulation approach for solving the inverse problem of kinetic heterogeneity in polymerization processes, specifically focusing on the production of polyisoprene using a gadolinium chloride solvate-based catalytic system. The proposed method is based on the assumption that the distribution of active centers (ACs) can be described by model distributions. By utilizing primary physicochemical data, such as the polymerization rate and molecular weight distribution, the simulation approach automatically identifies the kinetic parameters, determining the Frenkel statistical parameter and solving the problem of kinetic heterogeneity. The experimental results revealed the presence of at least three distinct types of ACs, each contributing different proportions to the polymerization process. The simulation approach offers valuable insights into the complexities of catalytic systems and their role in polymerization, paving the way for optimizing reaction conditions and advancing industrial polymer synthesis processes. This study marks a significant step forward in understanding and controlling polymerization reactions, with potential implications for the development of innovative materials and industrial applications.","PeriodicalId":11806,"journal":{"name":"e-Polymers","volume":"72 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140302323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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e-Polymers
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