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Improving Properties of Dynamic Vulcanized Polyurethane and Silicone Rubber Elastomer through Controlling Interphase Layer 通过控制界面层来改善动态硫化聚氨酯和硅橡胶弹性体的性能
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1410837
Lei Caihong, Xu Ruijie, Luo Xiaogang, Xie Jiayi
ABSTRACT In this work, a new kind of compatibilizer was prepared through the reaction between hyperbranched polyurethane and isocyanate-modified silicone oil and its application in the dynamic vulcanized polyurethane and silicone rubber elastomer was investigated. Compared with that of dynamic vulcanized thermoplastic polyurethane (TPU)/silicone rubber elastomer without compatibilizer, the introduction of 3% silicone-modified hyperbranched polyurethane lead to the increase in tensile strength from 8.1 to 13.9 MPa and the tear strength from 56.2 to 75.2 kN/m. The introduction of silicone-modified hyperbranched polyurethane as an interphase layer controller leads to the improvement in properties of TPU/silicone rubber elastomer. GRAPHICAL ABSTRACT
摘要本文通过超支化聚氨酯与异氰酸酯改性硅油的反应制备了一种新型增容剂,并研究了其在动态硫化聚氨酯和硅橡胶弹性体中的应用。与不添加增容剂的动态硫化热塑性聚氨酯(TPU)/硅橡胶弹性体相比,添加3%有机硅改性的支化聚氨酯的拉伸强度从8.1提高到13.9 MPa,撕裂强度从56.2提高到75.2 kN/m。引入硅改性超支化聚氨酯作为间相层控制器,提高了TPU/硅橡胶弹性体的性能。图形抽象
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引用次数: 4
Synthesis, Characterization, and Antibacterial Activity of Polyindole/Ag–Cuo Nanocomposites by Reflux Condensation Method 回流缩合法制备聚吲哚/ Ag-Cuo纳米复合材料及其抗菌性能研究
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1410832
M. Elango, M. Deepa, R. Subramanian, A. Mohamed Musthafa
ABSTRACT Polyindole-based silver and copper oxide (polyindole/Ag–CuO) nanocomposites were synthesized using reflux condensation method by varying the concentrations of polyindole and silver nitrate with copper oxide in N2 atmosphere. They were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), and scanning electron microscope (SEM) techniques. The SEM images revealed fascinating shapes of CuO nanoparticles. The FTIR and XRD confirmed the functional group transformation and crystalline natures of silver and CuO existed in the nanocomposites. The polyindole/Ag–CuO nanocomposites were examined for antibacterial activity and found to exhibit the antibacterial activity against pathogenic bacteria. GRAPHICAL ABSTRACT
摘要在N2气氛中,通过改变聚吲哚和硝酸银的浓度,采用回流缩合法制备了聚吲哚基银氧化铜纳米复合材料(聚吲哚/ Ag-CuO)。采用傅里叶变换红外(FTIR)、x射线衍射(XRD)和扫描电子显微镜(SEM)对其进行了表征。扫描电镜图像显示了CuO纳米颗粒的迷人形状。红外光谱(FTIR)和x射线衍射(XRD)证实了纳米复合材料中存在银和CuO的官能团转变和结晶性质。研究了聚吲哚/ Ag-CuO纳米复合材料的抗菌活性,发现其对致病菌具有抗菌活性。图形抽象
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引用次数: 85
Reinforcement Mechanism of Carbon Black (CB) in Natural Rubber Vulcanizates: Relationship Between CB Aggregate and Network Structure and Viscoelastic Properties 炭黑(CB)在天然橡胶硫化胶中的增强机理:炭黑骨料、网络结构与粘弹性的关系
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1381257
A. Kato, Y. Ikeda, S. Kohjiya
ABSTRACT Carbon black (CB) aggregates in CB-filled natural rubber (NR) vulcanizate were joined together and formed CB aggregates in the CB region less than 20 phr. It was found that the viscoelastic behavior was related to the hydrodynamic interaction between CB aggregate and NR matrix. In the CB loading region more than 40 phr, CB aggregates formed CB network structure in it. Using the parallel mechanical model of the two phases of a rubber matrix and an immobilized CB/NR interfacial layer excluding a CB phase, it was possible to quantitatively explain the relationship between the viscoelastic behavior of CB network structure. GRAPHICAL ABSTRACT
在CB填充的天然橡胶(NR)硫化胶中,炭黑(CB)团聚体在小于20 phr的CB区结合形成CB团聚体。研究发现,炭黑骨料的粘弹性行为与炭黑骨料与NR基体的水动力相互作用有关。在40phr以上的CB负荷区,CB聚集形成CB网络结构。利用橡胶基体的两相和不含CB相的固定化CB/NR界面层的平行力学模型,可以定量地解释CB网络结构粘弹性行为之间的关系。图形抽象
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引用次数: 28
Preparation and Properties of Anionic nylon-6-b-Polyether Amine Copolymers with Varying Soft Chain Length 不同软链长度阴离子尼龙-6-b聚醚胺共聚物的制备及性能研究
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1381258
Sheng Xu, Zhenxi Wang, Meng Cao, Xin Dai, Shangxi Zhang, Lingli Liu
ABSTRACT Monomer casting nylon-6-b-polyether amine (MCPA-b-PEA) copolymer were prepared through anionic polymerization which initiated by TDI-PEA macroinitiators with varying PEA molecular chain length. It was found that the TDI-PEA macroinitiator showed relatively low reactivity during the reaction process due to the long-chain PEA structure. The MCPA-b-PEA with shortest PEA chain length displayed highest crystallinity and biggest spherulites with large crystal grain size. The copolymers with long PEA chain length showed obvious toughness characteristic while that with short PEA chain length presented high tensile strength. The toughening mechanism was deduced to the combination of craze-shear band mechanism and multilayer crack extension mechanism. GRAPHICAL ABSTRACT
摘要采用不同分子链长度的TDI-PEA引发剂,通过阴离子聚合法制备了单体铸造尼龙-6-b-聚醚胺(MCPA-b-PEA)共聚物。研究发现,由于长链PEA结构,TDI-PEA宏观引发剂在反应过程中表现出较低的反应活性。PEA链长最短的MCPA-b-PEA结晶度最高,球晶最大,晶粒尺寸大。长PEA链长的共聚物具有明显的韧性,短PEA链长的共聚物具有较高的抗拉强度。将其增韧机理推导为裂纹-剪切带机制和多层裂纹扩展机制的结合。图形抽象
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引用次数: 1
Two-Step Processing Method for Blending High-Performance Polymers with Notable Thermal and Rheological Differences: PEI and PBT 两步法共混具有显著热流变差异的高性能聚合物:PEI和PBT
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1381256
M. Vásquez‐Rendón, Natalia Sánchez-Arrieta, M. Álvarez‐Láinez
ABSTRACT Blends between high-performance polymers (HPP) are barely studied, especially those produced by melting processing. In this work, it is proposed a novel methodology to prepare blends between polymers with notable processing temperature differences: poly(ether imide) (PEI) and poly(butylene terephthalate) (PBT). Processing parameters are settled after thermal and rheological evaluation of pure materials, those results suggest these blends need to be produced by steps. It is found a synergistic effect such as lowering PEI processing temperature and reducing PBT hydrolysis at high temperatures. Propose methodology allows to produce blends between HPP in the whole composition range with the same processing conditions. GRAPHICAL ABSTRACT
高性能聚合物(HPP)之间的共混物研究很少,特别是通过熔融加工生产的共混物。在这项工作中,提出了一种新的方法来制备具有显著加工温差的聚合物:聚醚亚胺(PEI)和聚对苯二甲酸丁二酯(PBT)之间的共混物。对纯材料进行热学和流变学评价后确定了工艺参数,结果表明这些共混物需要分步生产。发现了降低PEI加工温度和减少PBT高温水解的协同效应。建议的方法允许在相同的加工条件下在整个组成范围内生产HPP之间的共混物。图形抽象
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引用次数: 4
A Study on Polyurethane Hybrid Nanocomposite Foams Reinforced with Multiwalled Carbon Nanotubes and Silica Nanoparticles 多壁碳纳米管和纳米二氧化硅增强聚氨酯杂化纳米复合泡沫材料的研究
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1410834
A. Navidfar, A. Sancak, Kemal Yıldırım, L. Trabzon
ABSTRACT Multifunctional polyurethane foams reinforced with multiwalled carbon nanotubes and silica nanoparticles enhanced specific properties. We studied the effects of nanoparticle addition into polyurethane on mechanical properties and thermal stability by means of tensile, Charpy impact, hardness tests, and thermogravimetric analysis. Nanoparticles added to polyurethane are multiwalled carbon nanotubes, two types of silica nanoparticles, and multiwalled carbon nanotube/spherical silica as hybrid filler. Hybrid polyurethane/spherical silica/multiwalled carbon nanotube nanocomposite with the constant overall content of 0.75 wt% showed higher tensile strength, hardness, and thermal stability than either of nanoparticles at this content, which approves a synergistic effect between multiwalled carbon nanotubes and silica nanoparticles. GRAPHICAL ABSTRACT
多壁碳纳米管和二氧化硅纳米颗粒增强了多功能聚氨酯泡沫塑料的性能。通过拉伸、夏比冲击、硬度测试和热重分析,研究了纳米颗粒对聚氨酯力学性能和热稳定性的影响。添加到聚氨酯中的纳米颗粒有多壁碳纳米管、两种类型的二氧化硅纳米颗粒以及多壁碳纳米管/球形二氧化硅作为杂化填料。当总质量分数为0.75 wt%时,混合聚氨酯/球形二氧化硅/多壁碳纳米管纳米复合材料的抗拉强度、硬度和热稳定性均高于相同质量分数下的任何一种纳米材料,证明了多壁碳纳米管和纳米二氧化硅之间存在协同效应。图形抽象
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引用次数: 28
Nanostarch Reinforced with Chitosan/Poly (vinyl pyrrolidone) Blend for In Vitro Wound Healing Application 壳聚糖/聚(乙烯基吡咯烷酮)纳米淀粉增强物体外伤口愈合应用
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1381255
R. Poonguzhali, S. K. Basha, V. S. Kumari
ABSTRACT Nanostarch, which is inexpensive and environmentally abundant, has been used as filler to prepare biocompatible films. The bio-nanocomposites were synthesized by solution casting method. TEM analysis proves that the average particle size of the nanostarch is in the range of 20–40 nm. Thermal stability and cell viability of CS/PVP matrix were best enhanced at 1% of nanostarch loading. The antibacterial activity exhibited by CPS bio-nanocomposite against Staphylococcus aureus and Pseudomonas aeruginosa and synergistic effects of CPS such as barrier properties, swelling properties, and better blood compatibility make it a suitable material for in vitro wound healing application. GRAPHICAL ABSTRACT
摘要纳米淀粉作为一种廉价且环保的填料,被广泛用于制备生物相容性薄膜。采用溶液铸造法制备了生物纳米复合材料。TEM分析表明,纳米淀粉的平均粒径在20 ~ 40 nm之间。当纳米淀粉含量为1%时,CS/PVP基质的热稳定性和细胞活力得到了最好的提高。CPS生物纳米复合材料对金黄色葡萄球菌和铜绿假单胞菌的抗菌活性,以及CPS的屏障性能、溶胀性能和更好的血液相容性等协同效应,使其成为体外伤口愈合材料的理想选择。图形抽象
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引用次数: 30
Effect of Molecular Weight of Poly(Ethylene Glycol) Dicarboxylate on the Properties of Cross-Linked Hydrogel Film as an Antiadhesion Barrier 聚乙二醇二羧酸酯分子量对交联水凝胶膜抗粘附性能的影响
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1381254
Haryanto, N. Nurulita, E. Sundhani, P. Huh, S. Kim
ABSTRACT Poly(ethylene glycol) dicarboxylate (PEGDC)/poly(ethylene oxide) (PEO) cross-linked hydrogel films were developed as an antiadhesion barrier using an e-beam. The effects of molecular weight of PEGDC on hydrogel properties were investigated. The decrease in molecular weight of PEGDC increased the gel fraction and tissue adhesion, whereas the mechanical strength did not change considerably. On the other hand, the swelling ratio decreased rapidly with decreasing molecular weight of PEGDC. The cytotoxicity of PEGDC (2000 or 3000) was low, whereas that of PEGDC (1000) was higher. In animal studies, all hydrogels showed a better antiadhesive effect compared to the control. GRAPHICAL ABSTRACT
摘要:利用电子束制备了聚乙二醇二羧酸酯(PEGDC)/聚环氧乙烷(PEO)交联水凝胶膜作为抗粘附屏障。研究了PEGDC分子量对水凝胶性能的影响。PEGDC分子量的降低增加了凝胶分数和组织粘附性,而机械强度没有明显变化。另一方面,随着PEGDC分子量的减小,溶胀率迅速降低。PEGDC(2000和3000)的细胞毒性较低,而PEGDC(1000)的细胞毒性较高。在动物实验中,与对照组相比,所有水凝胶都表现出更好的抗粘附效果。图形抽象
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引用次数: 1
Doped Poly(m-phenylenediamine-co-aniline) (P(mPD-co-ANI)): Synthesis, Characterization, Physical Properties, and Precursor for CuO Nanoparticles 掺杂聚间苯二胺-共苯胺(P(mPD-co-ANI)): CuO纳米颗粒的合成、表征、物理性质和前驱体
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1410836
N. Hosny, M. Badr, F. El-Dossoki
ABSTRACT Poly(m-phenylenediamine-co-aniline) P(mPD-co-ANI) and Mn-, Ni-, and Cu-doped poly(m-phenylenediamine-co-aniline) (M-P(mPD-co-ANI)) have been synthesized and characterized. Cu-P(mPD-co-ANI) has been used as a molecular precursor of CuO nanoparticles. The spectral, optical, refractive index, solubility, and thermal properties of the synthesized polymers have been measured and discussed. The optical bandgap (Eg) measurements indicated that Ni(P(mPD-co-ANI)) has wider optical band than the pure (P(mPD-co-ANI)). Calcination of Cu-P(mPD-co-ANI) at 600°C produced (CuO) nanoparticles. The obtained nanoparticles have been characterized by XRD and TEM. The average size of CuO nanoparticles was found to be 42 nm. The refractive index measurements indicate slight change in the refractive index values of the polymer solution than that of pure solvent. The solubility of the synthesized polymers in ethanol, dimethyl formamide (DMF)–aqueous mixed solvents was found to increase as the mole fractions of both ethanol and DMF increase. The UV spectra of the synthesized polymers in ethanol, DMF–aqueous mixed solvents indicate blueshift and hyperchromic effect. GRAPHICAL ABSTRACT
合成了聚(间苯二胺-共苯胺)P(mPD-co-ANI)和Mn-、Ni-和cu掺杂的聚(间苯二胺-共苯胺)M-P(mPD-co-ANI)并对其进行了表征。Cu-P(mPD-co-ANI)被用作CuO纳米颗粒的分子前驱体。对合成聚合物的光谱、光学、折射率、溶解度和热性能进行了测量和讨论。光学带隙(Eg)测量表明,Ni(P(mPD-co-ANI))具有比纯(P(mPD-co-ANI))更宽的光学带。在600℃下煅烧Cu-P(mPD-co-ANI)产生CuO纳米颗粒。用XRD和TEM对所制得的纳米颗粒进行了表征。CuO纳米颗粒的平均尺寸为42 nm。折射率测量表明,聚合物溶液的折射率值与纯溶剂相比有轻微的变化。合成的聚合物在乙醇、二甲基甲酰胺(DMF) -水混合溶剂中的溶解度随着乙醇和DMF摩尔分数的增加而增加。合成的聚合物在乙醇、dmf -水混合溶剂中的紫外光谱显示出蓝移和超变色效应。图形抽象
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引用次数: 6
Studies on Interfacial Characteristics of Highly Dispersible Silica Reinforced Epoxidized Natural Rubber Compounds 高分散性二氧化硅增强环氧化天然橡胶化合物的界面特性研究
Q2 Materials Science Pub Date : 2018-09-22 DOI: 10.1080/03602559.2017.1410833
P. Manoharan, Tuhin Chatterjee, S. Pal, N. Das, K. Naskar
ABSTRACT The present work examines the effect of two different specific surface areas of highly dispersible silica (HDS)-reinforced epoxidized natural rubber (ENR) composites. The influences of different blend ratio between ENRs consisting 25 and 50 mol% of epoxidation-based (ENR-25/ENR-50) composites was studied in detail. The primary objective is to investigate the interfacial area of HDS surface involved in filler-to-rubber interaction mechanisms for the better reinforcement. Notable improvement in overall properties of these green composites are corroborated with various meticulous characterization including cure characteristics, specific bound rubber content, physicomechanical, dynamic mechanical properties, etc. Increasing the specific surface area of HDS and their subsequent interface with ENR matrix invokes its superior dispersion. Small angle X-ray scattering (SAXS) has been used to analyze the particles network and clusters establishment in green composites. The present SAXS method provides a unique insight into the cluster formation according to the Beaucage model. However, SAXS results demonstrate that particles networks can be effectively suppressed by increasing specific surface area of HDS. GRAPHICAL ABSTRACT
摘要:本研究考察了两种不同比表面积的高分散二氧化硅(HDS)增强环氧化天然橡胶(ENR)复合材料的影响。详细研究了环氧基(ENR-25/ENR-50)复合材料的共混比为25和50 mol%时对环氧基复合材料性能的影响。主要目的是研究HDS表面的界面面积参与填料与橡胶的相互作用机制,以获得更好的增强。这些绿色复合材料的整体性能得到了显著改善,包括固化特性、比结合橡胶含量、物理力学性能、动态力学性能等。增加HDS的比表面积及其随后与ENR基体的界面,可使其具有较好的分散性。利用小角x射线散射(SAXS)分析了绿色复合材料中颗粒网络和团簇的形成。目前的SAXS方法根据Beaucage模型提供了对星团形成的独特见解。然而,SAXS结果表明,增加HDS的比表面积可以有效地抑制粒子网络。图形抽象
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引用次数: 6
期刊
Polymer-Plastics Technology and Engineering
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