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Preparation and Performance of Poly(Lactic Acid)-γ-Cyclodextrin Inclusion Complex-Poly(Lactic Acid) Multibranched Polymers by the Reactive Extrusion Process 反应挤出法制备聚乳酸-γ-环糊精包合物-聚乳酸多支聚合物及其性能
Q2 Materials Science Pub Date : 2018-06-13 DOI: 10.1080/03602559.2017.1354224
Ya Li, W. Zhen
ABSTRACT The poly(lactic acid)-γ-cyclodextrin inclusion complex-poly(lactic acid) multibranched polymers were prepared by reactive extrusion process with L-lactide as raw material, stannous octoate as catalyst and the carboxyl poly(lactic acid)-γ-cyclodextrin inclusion compound as cores prepared by ultrasonic coprecipitation and carboxylation reaction. It was shown that the comprehensive performance of poly(lactic acid)-γ-cyclodextrin inclusion complex-poly(lactic acid) had been significantly improved compared with liner poly(lactic acid) by the study of structure and properties. Thus, the novel poly(lactic acid)-γ-cyclodextrin inclusion complex-poly(lactic acid) multibranched polymers have a potential use in biomedical materials. This study provided a simple and feasible preparation method for improving the performance of poly(lactic acid). GRAPHICAL ABSTRACT
摘要以l -丙交酯为原料,八酸锡为催化剂,羧基聚乳酸-γ-环糊精包合物为芯,经超声共沉淀法和羧化反应制备聚乳酸-γ-环糊精包合物-聚乳酸多支化聚合物。通过对聚乳酸-γ-环糊精包合物-聚乳酸的结构和性能的研究表明,与线性聚乳酸相比,聚乳酸的综合性能得到了显著提高。因此,新型聚乳酸-γ-环糊精包合物-聚乳酸多支聚合物在生物医用材料中具有潜在的应用前景。本研究为提高聚乳酸的性能提供了一种简单可行的制备方法。图形抽象
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引用次数: 6
sPS/PPS/Carbon Nanotube Ternary Composites with Improved Conductivity by Controlled Melt Blending Process sPS/PPS/碳纳米管三元复合材料导电性的控制熔体共混
Q2 Materials Science Pub Date : 2018-06-13 DOI: 10.1080/03602559.2017.1354225
Shuling Deng, Linmin Cao, Debin Kong, Zhidan Lin
ABSTRACT Syndiotactic polystyrene/poly(phenylene sulfide)/carbon nanotube ternary nanocomposites were prepared using a controlled melt blending process. The composites exhibited sea–island structures of syndiotactic polystyrene as continuous phase and poly(phenylene sulfide) as dispersed phase, and carbon nanotubes were concentrated on the interface or in the syndiotactic polystyrene phase. As a result, the theoretical percolation threshold of the composite was reduced to 0.399 wt%. Moreover, the electrical conductivity of the composite remained stable even after being processed for several times. Results revealed a particular effect of carbon nanotubes that their presence can enhance the dispersion of phases and provide conductivity to the blend at low contents in this system. GRAPHICAL ABSTRACT
采用可控熔融共混工艺制备了顺双规聚苯乙烯/聚(苯乙烯硫化物)/碳纳米管三元复合材料。复合材料表现为连续相聚苯乙烯和分散相聚苯乙烯的海岛结构,碳纳米管集中在界面或聚苯乙烯相中。结果,复合材料的理论渗透阈值降至0.399 wt%。此外,即使经过多次加工,复合材料的电导率仍保持稳定。结果表明,碳纳米管的存在可以增强相的分散,并在低含量的情况下为共混物提供导电性。图形抽象
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引用次数: 3
Recent Developments on Epoxy-Based Thermally Conductive Adhesives (TCA): A Review 环氧基导热胶粘剂(TCA)的研究进展
Q2 Materials Science Pub Date : 2018-06-13 DOI: 10.1080/03602559.2017.1354253
Ashutosh Kumar Singh, B. P. Panda, S. Mohanty, S. Nayak, M. Gupta
ABSTRACT The development of new polymer-based conductive adhesives with specific performances and improved conductivity are increasingly critical for thermally interface material (TIM). Epoxy resins have been widely used as a common interface material for conductive adhesives due to its well-known ability to accept wide range of fillers possibly derived from carbon, metallic or ceramic sources. These conductive fillers with high inherent thermal conductivity, together with a possibility to characterize and manipulate the system, leads to the production of thermally conductive adhesives with higher knowledge content for a number of electronics applications. GRAPHICAL ABSTRACT
开发具有特定性能和提高导电性的新型聚合物基导电胶粘剂对热界面材料(TIM)越来越重要。环氧树脂被广泛用作导电胶粘剂的常用界面材料,因为它具有广泛的接受可能来自碳、金属或陶瓷来源的填料的能力。这些具有高固有导热性的导电填料,以及表征和操作系统的可能性,导致生产具有更高知识含量的导热粘合剂,用于许多电子应用。图形抽象
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引用次数: 27
Review on Three-Dimensionally Emulated Fiber-Embedded Lactic Acid Polymer Composites: Opportunities in Engineering Sector 三维仿真纤维嵌入乳酸聚合物复合材料的研究进展:在工程领域的机遇
Q2 Materials Science Pub Date : 2018-06-13 DOI: 10.1080/03602559.2017.1354226
Nikit Deoray, B. Kandasubramanian
ABSTRACT The proficiency to three-dimensional (3D) interweaves engineering complex structures enables component engineering with heterogeneous geometries, attributing mechanically robust lightweight cellular structures. 3D printing proffers versatile contingencies toward the single-step engineering of near-net heterogeneous 3D structure for engineering application. For enhancing the current spectrum of 3D printing technologies and rising concern toward environmental issues, 3D printing of bioactive polylactic acid is extensively exploited owing to its biodegradability and renewable aspects. Synchronously, curiosity for 3D printed composites through fiber infusion has led to the configuration of high-performance composites with augmented mechanical, physical, and chemical attributes, paving its way for wide-array engineering applications. GRAPHICAL ABSTRACT
对三维(3D)交织工程复杂结构的熟练掌握使部件工程具有异质几何形状,赋予机械坚固的轻质细胞结构。3D打印为工程应用的近网络异构3D结构的单步工程提供了多种可能性。为了提高当前3D打印技术的应用范围和人们对环境问题的日益关注,生物活性聚乳酸的生物可降解性和可再生性被广泛应用于3D打印。与此同时,人们对3D打印复合材料的好奇心通过纤维注入导致了高性能复合材料的配置,具有增强的机械、物理和化学属性,为广泛的工程应用铺平了道路。图形抽象
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引用次数: 35
Review of the Mechanical Properties of a 3D Woven Composite and Its Applications 三维编织复合材料的力学性能及其应用综述
Q2 Materials Science Pub Date : 2018-05-24 DOI: 10.1080/03602559.2017.1344857
Tao Huang, Yanling Wang, G. Wang
ABSTRACT Owing to their complex structural characteristics, 3D woven composites display different mechanical properties and failure modes from traditional composite laminates. The relations between the weaving geometry and main mechanical properties of composites are obtained by studying the internal structures of 3D woven textile. This paper reviews the research on the mechanical behavior such as tension, compression, shear, flexural, and impact properties, and analytical models of 3D woven polymer matrix composites mainly in four major inner structures and discusses the development of mechanical properties and applications of 3D woven fabrics and suggests further studies on aero industry. GRAPHICAL ABSTRACT
三维编织复合材料由于其复杂的结构特点,表现出不同于传统复合材料层压板的力学性能和破坏模式。通过对三维编织物内部结构的研究,得到了编织物几何形状与复合材料主要力学性能之间的关系。本文综述了三维机织聚合物基复合材料的拉伸、压缩、剪切、弯曲、冲击等力学性能的研究进展,以及主要在四种内部结构中的分析模型,讨论了三维机织织物力学性能的发展及其在航空工业中的应用,并提出了进一步的研究方向。图形抽象
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引用次数: 55
Rubber (SEBS-g-MA) Toughened Flame-Retardant Polyamide 6: Microstructure, Combustion, Extension, and Izod Impact Behavior 橡胶(SEBS-g-MA)增韧阻燃聚酰胺6:微观结构,燃烧,延伸,和Izod冲击行为
Q2 Materials Science Pub Date : 2018-05-24 DOI: 10.1080/03602559.2017.1344856
Hao Wu, M. Krifa, J. Koo
ABSTRACT In this study, elastomer toughening is explored as a means of recovering ductility of polyamide 6/intumescent flame-retardant composite systems. This was achieved using a maleic anhydride modified SEBS elastomer incorporated into the system by twin-screw melt extrusion. TEM micrographs show an even distribution of both flame retardant and elastomer particles. The effects of elastomer content on mechanical properties, Izod impact behavior, and flammability of the polymer system were investigated. The incorporation of flame retardant significantly degraded the elongation and ductility of the polymer system. The addition of the elastomer succeeded in significantly enhancing the Izod impact strength and partially recovering the elongation at break without compromising the flame-retardant performance. Micro-scale Combustion Calorimeter (MCC) tests show that samples containing both elastomer and FR additives exhibit slightly improved combustion properties compared to the original polyamide 6/intumescent flame-retardant system. Rubber loadings of up to 15 wt% were possible while still achieving the highest UL-94 V0 flame exposure rating indicating a self-extinguishing and non-drip behavior. GRAPHICAL ABSTRACT
在本研究中,弹性体增韧作为一种恢复聚酰胺6/膨胀阻燃复合系统延性的手段进行了探索。这是通过双螺杆熔融挤出将马来酸酐改性的SEBS弹性体加入系统中实现的。TEM显微图显示阻燃剂和弹性体颗粒均匀分布。研究了弹性体含量对聚合物体系力学性能、抗冲击性能和可燃性的影响。阻燃剂的掺入显著降低了聚合物体系的伸长率和延展性。弹性体的加入成功地显著提高了抗冲击强度,并在不影响阻燃性能的情况下部分恢复了断裂伸长率。微尺度燃烧量热计(MCC)测试表明,与原有的聚酰胺6/膨胀阻燃体系相比,含有弹性体和FR添加剂的样品的燃烧性能略有改善。橡胶负载高达15 wt%是可能的,同时仍然达到最高的UL-94 V0火焰暴露等级,表明自熄和不滴行为。图形抽象
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引用次数: 18
Preparation and Assessment of Phase Morphology, Rheological Properties, and Thermal Behavior of Low-Density Polyethylene/Polyhexene-1 Blends 低密度聚乙烯/聚己烯-1共混物的制备及相形态、流变性能和热行为的评价
Q2 Materials Science Pub Date : 2018-05-24 DOI: 10.1080/03602559.2017.1344858
M. R. Jozaghkar, Y. Jahani, H. Arabi, F. Ziaee
ABSTRACT In this work, polyhexene-1 (PH-1) is synthesized by polymerization of hexane-1 with Ziegler–Natta catalyst and melt blended with low-density polyethylene (LDPE). The phase morphology, rheology, crystallization, and thermal behavior of (LDPE)/PH-1 blends are investigated. A good compatibility is observed in the blends up to 10 wt% PH-1 and the most of the droplets in the fractured surface are covered with and buried in the LDPE matrix and at higher percentage the droplet particle size significantly increased. The effect of microstructure of the blends on the flow behavior is studied by small amplitude oscillation rheology. By decreasing the compatibility and increasing the particle size, the Cole–Cole plots are deviated from the semi-circular shape at higher percentages than 10 wt% of PH-1. The change in the crystallization and melting behavior of LDPE in the blends are studied by differential scanning calorimetry and X-ray diffraction (XRD). It is found that by increasing the PH-1 the melting temperature of LDPE decreased from 112.5 to 110.8°C and crystallization temperature increased from 95.2 to 97.7°C which is evident of the nucleation effect. The intensity of (110) peak in XRD test declined as a remake of amorphous part of LDPE and the degree of crystallinity of LDPE decreased from 28 to 22% at 20 wt% PH-1. GRAPHICAL ABSTRACT
摘要本研究采用Ziegler-Natta催化剂将己烷-1与低密度聚乙烯(LDPE)熔体共混聚合,合成了聚己烯-1 (PH-1)。研究了(LDPE)/PH-1共混物的相形态、流变学、结晶和热行为。在高达10 wt% PH-1的共混物中观察到良好的相容性,并且裂缝表面的大多数液滴被LDPE基体覆盖并埋在基体中,当液滴百分比较高时,液滴粒径显着增加。采用小振幅振荡流变学方法研究了共混物微观结构对流动性能的影响。通过降低相容性和增大粒径,Cole-Cole图偏离半圆形状的比例高于PH-1的10 wt%。采用差示扫描量热法和x射线衍射(XRD)研究了共混物中LDPE结晶和熔化行为的变化。结果表明,随着PH-1的增加,LDPE的熔融温度从112.5℃降低到110.8℃,结晶温度从95.2℃提高到97.7℃,这是明显的成核效应。在20 wt% PH-1条件下,LDPE的(110)峰强度下降,结晶度从28%下降到22%。图形抽象
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引用次数: 11
Waste Eggshell-Derived Calcium Oxide and Nanohydroxyapatite Biomaterials for the Preparation of LLDPE Polymer Nanocomposite and Their Thermomechanical Study 废蛋壳源氧化钙和纳米羟基磷灰石生物材料制备LLDPE聚合物纳米复合材料及其热力学研究
Q2 Materials Science Pub Date : 2018-05-24 DOI: 10.1080/03602559.2017.1354221
H. Jirimali, B. Chaudhari, Jitendra C. Khanderay, S. Joshi, Vijay P. Singh, A. Patil, V. Gite
ABSTRACT Waste eggshells were utilized to make calcium oxide (E-CaO) and hydroxyapatite (E-HAP). E-CaO obtained by heat treatment to eggshells was utilized for the synthesis of E-HAP. Melt compounding of E-CaO/E-HAP was performed with linear low-density polyethylene (LLDPE) on a Brabender Plastograph and ground the obtained formulation for injection molding. Addition of E-CaO/E-HAP in the LLDPE significantly enhanced the flame retardant ability and thermal stability of resultant composites. In the comparative study, E-HAP nanopowder-containing polymer composite showed increment in thermal and mechanical properties than the composite prepared using E-CaO. GRAPHICAL ABSTRACT
利用废蛋壳制备氧化钙(E-CaO)和羟基磷灰石(E-HAP)。利用蛋壳热处理得到的E-CaO合成E-HAP。在Brabender塑形机上用线性低密度聚乙烯(LLDPE)熔融复合E-CaO/E-HAP,并将得到的配方研磨成型。在LLDPE中加入E-CaO/E-HAP可显著提高复合材料的阻燃性能和热稳定性。在对比研究中,E-HAP纳米粉末聚合物复合材料的热性能和力学性能都比E-CaO制备的复合材料有所提高。图形抽象
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引用次数: 32
Novel Facial Conducting Polyamide-Based Dithiophenylidene Cyclyhexanone Moiety Utilized for Selective Cu2+ Sensing 基于聚酰胺的新型面部导电二噻吩基环己酮片段用于选择性Cu2+传感
Q2 Materials Science Pub Date : 2018-05-24 DOI: 10.1080/03602559.2017.1354222
M. Hussein, M. M. Rahman, Abdullah M. Asiri
ABSTRACT The present work is aimed to synthesize a novel series of linear polyamides (PAs) 4a–d based on di(thiazolyl-thiophenylidene)cyclyhexanone as well as carries aliphatic and aromatic species in the polymer main backbones. The polymerization process was occurred by solution polycondensation technique by the interaction of the newly synthesized monomer 3 with adepoyl, sebacoyl, terphthaloyl, and isophthaloyldiacid chlorides. Before polymerization, the structure of monomer 3 was confirmed by elemental and spectral analyses. The structures of polymers were also investigated by elemental, spectral analysis, thermal analysis, and Field-Emission Scanning Electron Microscopy (FE-SEM) micrographs. Film draw temperatures for all the polymers were evaluated in the range 509.0–542.3°C. Here, the heavy metallic sensors are developed with the polyamide-fabricated glassy carbon electrode (GCE) by reliable current vs. voltage technique. A thin layer of PA onto GCE was fabricated with conducting coating agents (5% nafion) to fabricate a selective heavy metal ions, Cu2+ sensor in short response time in phosphate buffer phase. The fabricated sensor was also exhibited higher sensitivity, lower detection limit, large dynamic concentration ranges, long-term stability, and improved electrochemical performances toward Cu2+ sensor. The calibration plot is linear (r2: 0.9956) over the large Cu2+ ion concentration ranges (1.0 nM to 10.0 mM). The sensitivity and detection limit is 3.4177 µA cm−2 µM−1 and 0.36 nM (signal-to-noise ratio of 3) respectively. This novel effort is initiated a well-organized way of efficient cationic sensor improvement with conductive polymers for heavy metallic pollutants in environmental and health-care fields in large scales. GRAPHICAL ABSTRACT
摘要本研究以二(噻唑基-噻吩基)环己酮为主要骨架,以脂肪族和芳香族为主要骨架,合成了一系列新的直线型聚酰胺(PAs) 4a-d。通过溶液缩聚技术,将新合成的单体3与二甲酰、癸二酰、三苯二酰和异苯二酰氯相互作用,进行了聚合反应。聚合前对单体3的结构进行了元素分析和光谱分析。通过元素分析、光谱分析、热分析和场发射扫描电子显微镜(FE-SEM)对聚合物的结构进行了研究。所有聚合物的薄膜拉伸温度在509.0-542.3°C范围内进行评估。本文采用可靠的电流vs电压技术,利用聚酰胺制造的玻碳电极(GCE)开发了重金属传感器。采用导电涂层剂(5% nafion)在GCE表面制备了一层薄层PA,在磷酸盐缓冲相中快速响应制备了选择性重金属离子Cu2+传感器。该传感器对Cu2+具有较高的灵敏度、较低的检出限、较大的动态浓度范围、长期的稳定性和较好的电化学性能。在较大的Cu2+浓度范围内(1.0 nM ~ 10.0 mM),校正图呈线性关系(r2: 0.9956)。灵敏度为3.4177µA cm−2µM−1,检出限为0.36 nM(信噪比为3)。这种新颖的努力是在环境和卫生保健领域大规模利用导电聚合物对重金属污染物进行高效阳离子传感器改进的一种组织良好的方式。图形抽象
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引用次数: 8
Condensed Tannin-Based Polyurethane as Functional Modifier of PLA-Composites 缩合单宁基聚氨酯作为pla复合材料的功能改性剂
Q2 Materials Science Pub Date : 2018-05-24 DOI: 10.1080/03602559.2017.1344855
D. E. García, J. P. Salazar, S. Riquelme, Nacarid Delgado, S. Paczkowski
ABSTRACT Novel polylactic acid-based composites were prepared for the first time by melt-blending urethanization using bark polyflavonoids, and polymeric methyl diisocyanate. Rheological, morphological, structural, thermal, and mechanical properties were studied. Polymerization between polyflavonoids and isocyanate during the melt-blending was demonstrated by spectroscopy, confocal microscopy, and thermal analysis. Polyflavonoids improved the blend processability and affected the polylactic acid-crystallization, blend-urethanization, and flexural features. Polyphenols act as nucleating agent, and the effect was highly influenced by the polymeric methyl diisocyanate-charge, and the polyflavonoids-content. Low polymeric methyl diisocyanate-loading (10 wt%) degrades the elasticity modulus (E), while the highest polymeric (20 wt%) improved the miscibility between the polylactic acid polymer-matrix and the polyflavonoids. GRAPHICAL ABSTRACT
摘要以树皮总黄酮和聚合二异氰酸酯甲酯为原料,采用熔融共混脲烷化法制备了新型聚乳酸基复合材料。对其流变、形态、结构、热学和力学性能进行了研究。通过光谱、共聚焦显微镜和热分析证实了熔合过程中多黄酮和异氰酸酯之间的聚合。聚黄酮类化合物改善了共混物的加工性能,影响了聚乳酸结晶、共混脲化和弯曲性能。多酚类物质作为成核剂,其成核效果受聚合物二异氰酸酯含量和多黄酮含量的影响较大。低聚合物二异氰酸酯负载(10 wt%)降低弹性模量(E),而高聚合物负载(20 wt%)改善了聚乳酸聚合物基质与多黄酮类化合物之间的混溶性。图形抽象
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引用次数: 13
期刊
Polymer-Plastics Technology and Engineering
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