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Totally found 1462 items.

  • [期刊] In situ grafting of polybutylene terephthalate onto multi-walled carbon nanotubes by melt extrusion, and characteristics of their composites with polybutylene terephthalate
    Multi-walled carbon nanotubes (MWCNTs) functionalized with hydroxyl groups were explored as effective fillers for polybutylene terephthalate (PBT) composites with expected in situ transesterification between hydroxyl groups in MWCNTs and ester groups in the PBT during melt extrusion. The interfacial adhesion energy between PBT and PBT-grafted MWCNTs (PBT-g-MWCNTs) calculated by using drop-on fiber method was higher than that between PBT and pristine MWCNTs. As a result of higher interfacial adhesion energy, the dispersion of MWCNTs in the PBT matrix and interfacial adhesion between the MWCNTs and PBT matrix were better in the case of the PBT/PBT-g-MWCNT composite than in the case of the PBT composite with pristine MWCNTs. The former also exhibited better mechanical properties and electrical conductivity than the latter at the same MWCNT content. (C) 2016 Elsevier Ltd. All rights reserved.
  • [期刊] In situ grafting of polybutylene terephthalate onto multi-walled carbon nanotubes by melt extrusion, and characteristics of their composites with polybutylene terephthalate
    Multi-walled carbon nanotubes (MWCNTs) functionalized with hydroxyl groups were explored as effective fillers for polybutylene terephthalate (PBT) composites with expected in situ transesterification between hydroxyl groups in MWCNTs and ester groups in the PBT during melt extrusion. The interfacial adhesion energy between PBT and PBT-grafted MWCNTs (PBT-g-MWCNTs) calculated by using drop-on fiber method was higher than that between PBT and pristine MWCNTs. As a result of higher interfacial adhesion energy, the dispersion of MWCNTs in the PBT matrix and interfacial adhesion between the MWCNTs and PBT matrix were better in the case of the PBT/PBT-g-MWCNT composite than in the case of the PBT composite with pristine MWCNTs. The former also exhibited better mechanical properties and electrical conductivity than the latter at the same MWCNT content. (C) 2016 Elsevier Ltd. All rights reserved.
  • [期刊] Rain erosion resistance of injection moulded and compression moulded polybutylene terephthalate PBT
    Offshore wind turbine rotor diameters still increase. Blade tip velocities are up to 110 m/s, giving rise to more severe raindrop impact conditions and related erosion of the wind turbine blades. In the current work droplet impingement erosion tests were performed for injection moulded and compression moulded polybutylene terephthalate PBT. The measured incubation periods were compared to an extended and improved fatigue based erosion model.
  • [期刊] Effect of the selective distribution of graphite nanoplatelets on the electrical and thermal conductivities of a polybutylene terephthalate/polycarbonate blend
    Controlling the functional filler selective distribution in a co-continuous polymer blend matrix is an effective way to achieve a high-performance functional composite with a relative lower filler loading. In this work, a polybutylene terephthalate/polycarbonate (PBT/PC) blend with good performance complementarity is selected as the host matrix, and graphite nanoplatelets (GNPs) with excellent conductivity and a typical two-dimensional layered structure serve as the functional filler. PBT/PC/GNPs composites with different blend ratios were prepared by using a melting mix technique. The selective segregated distribution of filler in the polymer blend and the corresponding thermal conductivity, electrical conductivity, and mechanical properties of the PBT/PC/GNPs composites were systematically investigated. The migration mechanism of GNPs in the PBT/PC blend is also discussed based on the thermodynamic calculation prediction. Kinetic experimental results indicate that the morphology of the series of PBT/PC/GNPs composites changes with the proportion of PBT and PC. A co-continuous phase morphology formed at a 50:50 vol ratio of PBT/PC. Thermodynamic analysis showed that GNPs are more likely to be distributed in the PBT phase because the interfacial tension between PBT and GNPs is lower than that between PC and GNPs. The results of the kinetic experiments and selective etching experiment further confirmed the above prediction. The thermal conductivity and electrical conductivity of PBT/PC/GNPs composites have been effectively improved with the segregated distribution of GNPs in a co-continuous PBT/PC blend. Compared to a binary PBT or PC matrix composite, the electrical conductivity of PBT/PC/GNPs ternary composite filled with 3 vol% GNPs increased by eight orders of magnitude and the thermal conductivity increased by similar to 10% for the same content of GNPs. Simultaneously, the tensile strength of the PBT/PC/GNPs composite is 50 MPa, which maintains a high application value.
  • [期刊] 聚对苯二甲酸丁二醇酯
    [英文名称]Polybutylene terephthalate[化学名称] 聚对苯二甲酸丁二醇酯[分子式、相对分子质量]平均相对分子质量:23000-30000[别名] 聚酯,PBT[物化性能]乳白色、无味无毒塑料颗粒,是一种结晶性、热塑性饱和聚酯树脂,密度1.31g/cm3,熔点222-226℃,耐化学腐蚀,不溶于一般有机溶剂,在二氯乙烷、芳烃、醋酸、醋酸乙酯中可溶胀,在浓HNO3中可分解,纯PBT树脂机械性能一般,可用玻纤增强提高其性能和使用寿命。[毒性与保护] 无毒。
  • [期刊] Polybutylene terephthalate
    Judy Bucher; Plastics World; V.55 N.5 1997; 61
  • [期刊] New Composite Materials Based on polybutylene terephthalate and Mineral Fillers
    For the first time new polymer composites based on poly(butylene terephthalate) and natural fillers have been obtained. Preparation were cleaning and dispersing of natural filler were carried out and polymer composites prepared by melt blending using these fillers were obtained. The effect of fillers of different nature on the rheological and conductive properties of poly(butylene terephthalate) have been studied. The complex of physical and mechanical properties, fire resistance, heat resistance and water absorption of the composites have been investigated.
  • [期刊] Polybutylene terephthalate modified with dimer acid methyl ester derived from fatty acid methyl esters and its use as a hot-melt adhesive
    A series of polyester copolymers was synthesized via melt polycondensation of dimethyl terephthalate (DMT), dimethyl isophthalate (DMI), and 1,4-butanediol (BDO) with dimer acid methyl ester (DAME) monomers, previously prepared by the Diels-Alder reaction of fatty acid methyl esters (FAMEs). We obtained copolymers with the desired composition and a high molar mass characterized by 1H NMR, FT-IR, and SEC. The relationship among the composition, thermal behavior, mechanical properties, and adhesion properties of these copolymers was examined, demonstrating that the DAME-modified copolymers could be substituted for HMA applications and are comparable to petroleum-based commercial products. As a result, these polyesters could offer improved sustainability and performance and may be good candidates for hot-melt adhesive materials. (c) 2019 Wiley Periodicals, Inc.
  • [期刊] 聚对苯二甲酸丁二醇酯(PBT)/阻燃剂填充PBT交替层状复合材料阻燃和力学性能
    利用微层共挤出技术制备了不同层数的聚对苯二甲酸丁二醇酯(PBT)/阻燃剂(FR)填充的PBT交替层状复合材料,研究层数和层厚对复合材料阻燃性能和力学性能的影响.研究表明,随着层数的增加,体系的阻燃和力学性能均显著提高.当层数由2层增加到64层,材料的极限氧指数从20%提高到了25.5%,拉伸强度提高了4.3%,断裂伸长率保持稳定.这为制备兼具优异阻燃和力学性能的PBT复合材料提供了新的思路和途径.
  • [期刊] 高循环利用的无卤阻燃聚对苯二甲酸丁二醇酯(PBT)研制
    综合对比自行研制的无卤阻燃PBT与传统卤系阻燃PBT的力学性能、阻燃性能、电性能。研究无卤阻燃PBT材料在多次循环回收利用情况下的性能变化。结果表明:在满足相同的阻燃要求时,无卤阻燃PBT和卤系阻燃PBT的综合力学性能相当;无卤阻燃PBT的电性能明显优于卤系阻燃PBT;无卤阻燃PBT可在大比例回填下综合性能基本保持不变。
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