Small range 文档类型:"1"

Totally found 116 items.

  • [会议] Development of a new polybutylene terephthalate material for laser sintering process
    Laser sintering of polymers gets more and more importance for small series production. However, available materials do not always fulfil requirements of the intended applications. New developments on the market should close this gap. However, some of these new materials are difficult to process or do not have expected properties. Aim of the presented study was to develop a polybutylene terephthalate material for laser sintering process. Material properties, processing conditions as well as part properties of the different experimental grades are investigated. Fundamental knowledge on the processing of this new material type in laser sintering is established.
    关键词: Laser Sintering;Additive Manufacturing;New Materials;Plastics;Polybuthylen terephthalate;Mechanical Properties;Part's Density;Process Understanding
  • [会议] 聚对苯二甲酸丁二醇酯(PBT)在超/亚临界乙醇中的解聚
    采用间歇高压反应釜研究了聚对苯二甲酸丁二醇酯(PBT)在超/亚临界乙醇中的解聚。在投料比10.0(20g EtOH/2g PBT)条件下,主要考察反应时间(5~60 min)、反应温度(200~280 ℃)对PBT 解聚率以及主产物对苯二甲酸二乙酯(DET)和1,4-丁二醇(1,4-BD)产率的影响。实验结果表明:PBT 在乙醇中的解聚率、主产物DET和1,4-BD的产率均随温度的升高、反应时间的延长而增加。根据对解聚产物的分析,并结合PBT的链结特点,提出了解聚机理。在微型毛细管反应器中结合显微放大技术研究了PBT 在乙醇中相态变化,温度上升至603 K后 PBT 能完全溶解于乙醇中,解聚反应在均相中进行。
    关键词: 聚对苯二甲酸丁二醇酯;解聚率;超/亚临界;乙醇;高压反应釜;相态
  • [会议] Totally Gel-Free Fiber Optical Cables Manufactured With PBT
    Optical cables manufactured with loose tube technology have been used for a long time by the data transmission industry. Its robust construction has made possible to install it in various environments, especially in outdoor plants, where performance reliability is required in cold, heat, underground and aerial installations. The construction of the cable is based on the secondary protection given by plastic tube over a bundle of fibers, thus making it possible to develop cables within the most varied range of fibers, ensuring great robustness against traction and compression. This paper introduces a PBT (Polybutylene Terephthalate) dry buffer tubes cables, a dry tubes made with the well-known material used for year as standard for jelly filled buffer tube as alternative to PP (Polypropylene), and establish a comparison between two totally dry optical cables with the same design, where only the raw material of the dry buffer tube changes (from PP to PBT), to show their similarities and differences. The LEEE 1222-2011 standard - Testing and Performance for All-Dielectric Self-Supporting (ADSS) Fiber Optic Cable for Use on Electric Utility Power Lines [1] was used as reference for the evaluation of these cables.
    关键词: PP;PBT;Totally dry optical cables
  • [会议] Tensile Behaviour of Modified PBT by Radiation Cross-linking
    Radiation processing of polymers is a wellestablished and economical commercial method of precisely modifying the properties of polymers. The industrial applications of the radiation processing of plastics and composites include polymerization, crosslinking, degradation and grafting. Radiation processing mainly involves the use of either electron beams from electron accelerators or gamma radiation from Cobalt-60 sources. The PBT Polybutylene terephthalate was used in this research and the tensile behaviour was investigated at the ambient temperature. Results demonstrate that PBT has higher values of tensile strength and E-modulus with the increased irradiation dose and it has decreased elongation at break. This behaviour leads to the expansion of these materials in the automotive and electrical industry.
    关键词: Tensile strength;Elongation;E-modulus;Radiation cross-linking;Polybutylene terephthalate
  • [会议] A study on mechanical properties of PBT nano-composites reinforced with microwave functionalized MWCNTs
    Polybutylene Terephthalate (PBT) is a synthetic thermoplastic polymer with fast crystallization rate; and is extensively used in many automobile applications where it is prone to continuous wear.Carbon Nanotubes (CNTs) as reinforcements are most ideal and promising reinforcement in enhancing mechanical properties of polymers.Owing to strong van der Waals' interaction between the nanotubes; they tend to aggregate.To overcome this behavior, CNTs are generally functionalized in acid solutions to help stabilize the dispersion and allow interaction with polymer matrix.Thus, the present study focuses on the effect of reinforcing microwave-functionalized CNTs on the mechanical and tribological properties of PBT polymer matrix.The homogenous dispersion of CNTs in PBT matrix was successfully achieved by functionalizing the CNTs.DSC and XRD analysis confirms better crystalhzation and reduced crystallite size due to improved nucleation.Apart; an increase in the hardness and MFI value was also noted, which again hinted towards improved dispersion.However, the reduction in tensile strength and % elongation indicated embrittlement of the PBT matrix after addition of functionalized CNTs.Furthermore, the peeling and scuffing phenomenon observed for virgin PBT, during sliding wear, was suppressed after CNT addition.
    关键词: Functionalization; MWCNTs; PBT; Tensile; Wear
  • [会议] 复合阻燃体系在阻燃聚碳酸酯/聚对苯二甲酸丁二醇酯合金中的应用机理
    关键词: 复合材料;聚碳酸酯;聚对苯二甲酸丁二醇酯;复合阻燃体系;制备工艺;阻燃性能;热分解行为
  • [会议] 聚对苯二甲酸丁二醇酯/二乙基次膦酸铝盐/多官能环氧聚硅氧烷的阻燃机理
    聚对苯二甲酸丁二醇酯(PBT)/二乙基次膦酸铝盐(AlPi)体系中加入多官能环氧聚硅氧烷(EPM),采用极限氧指数(LOI)、垂直燃烧等级等评价其阻燃性能.结果表明,0.6wt%EPM能使PBT/AlPi(11wt%)体系的LOI提高到37.1%,且通过UL-941.6mm V-0级,阻燃性能大大提高,依照TGA和TGA-FTIR结果分析,在PBT/11AlPi/0.6EPM体系热分解过程中EPM、PBT与AlPi发生强烈的相互作用,促进成炭,表现出凝聚相阻燃作用.
    关键词: 聚对苯二甲酸丁二醇酯;二乙基次膦酸铝盐;环氧聚硅氧烷;阻燃机理
  • [会议] 玻纤增强聚对苯二甲酸丁二醇酯的阻燃改性研究
    采用有机次膦酸盐为基的阻燃剂对30wt%玻纤(GF)增强的聚对苯二甲酸丁二醇酯(PBT)进行阻燃改性,研究了有机次膦酸盐对PBT复合材料阻燃性能的影响.实验表明,当有机次膦酸盐含量为20wt%时,复合材料可达到UL-94 3.2mm V-0级;当其含量为25wt%时,复合材料可达UL-94 1.6mm V-0级,较去年阻燃会议报道的阻燃剂体系的效果稍好.研究还发现,有机次膦酸盐与三聚氰胺焦磷酸盐(MPyP)复配体系有良好的协效阻燃效果,在适当的配比下,可以在阻燃剂总量为20wt%的30wt%玻纤含量的PBT复合材料的垂直燃烧级别达到1.6mm V-0级.本文还研究了体系的热分解行为和燃烧行为.
    关键词: 复合材料;聚对苯二甲酸丁二醇酯;玻璃纤维;阻燃改性;阻燃性能
  • [会议] 聚对苯二甲酸丁二醇酯-聚丁二酸丁二醇酯共聚物的结构-性能研究
    关键词: 聚对苯二甲酸丁二醇酯;聚丁二酸丁二醇酯;生物可降解高分子;拉伸诱导结晶;小角X射线散射
  • [会议] 我国聚对苯二甲酸丁二醇酯的市场分析
    关键词: 化工行业;聚对苯二甲酸丁二醇酯;市场分析