Improved compatibility of PET/HDPE blend by using GMA grafted thermoplastic elastomer

ABSTRACT

Herein, graft-modified ethylene-1-octene copolymer (POE-g-GMA) and styrene-butadiene-styrene triblock copolymer (SBS-g-GMA) were found to be excellent reactive compatibilizers for immiscible poly(ethylene terephthalate) (PET)/high-density polyethylene (HDPE) blends via in-situ reaction compatibilization. With increase in compatibilizer amount, uniform phase morphology was observed in all the blends. Thus, exhibiting enhanced mechanical properties, especially, the notched Izod impact strength. In comparison with SBS-g-GMA, compatibilizer POE-g-GMA demonstrated greater impact on the compatibility. The addition of 15% POE-g-GMA produced blends with best mechanical properties. Besides, both POE-g-GMA and SBS-g-GMA enhanced the melt viscosity of PET/HDPE blends.     

原位聚合法制备PMMA/膨胀石墨纳米复合材料

通过原位聚合将甲基丙烯酸甲酯(MMA)单体插入膨胀石墨层间,制备出以石墨层片为纳米分散相的导电复合材料.用红外光谱和X-射线衍射分析证实复合材料的合成,并讨论了石墨含量对复合材料的力学性能和导电性能的影响.     

水性含磷功能性聚合物的制备及应用

水性含磷功能性聚合物是一种环境友好材料,且具有阻燃、耐热、防腐、生物相容性好以及改善粘接性能等多种特性.本文介绍了水性含磷功能性聚合物的结构和制备方法,综述了其在粘合剂、涂料以及生物医用材料等方面的应用报道,并展望了其发展前景.     

紫外光固化光纤标识油墨的颜料耐迁移性

简述颜料耐迁移性对光纤标识油墨的重要性.研究了颜料的自身性能如种类、含量和分散状态,涂膜的物理性能如固化度和玻璃化温度对颜料耐迁移性的影响.     

Development of a scintillation detector for real-time measurement of space proton effective dose

In this study, a scintillation detector was developed to measure the space proton effective dose for astronauts based on the proton effective dose conversion coefficients provided by International Commission on Radiological Protection Report No. 116. In the Monte Carlo N-Particle Transport Code X(version 2.6.0) simulation process, by modulating the depth and solid angle of truncated conical holes in an iron shell from lower-energy protons to higher-energy protons, the energy deposited in the scintillator by isotropic protons was nearly proportional to the corresponding effective dose, with a maximum relative deviation of 13.28% at thirteen energy points in the energy range of 10–400 MeV. Therefore, the detector can monitor proton effective dose indirectly in real time by measuring the deposited energy. We calibrated the photoelectric conversion efficiency of the detector at the cobalt source, tested the response of the detector in the energy range of 30–100 MeV in unidirectional proton field, and validated the simulation with the experimental results.     

New environmental-friendly yellow pigments Y_(4-x)A_xMoO_(9+δ)(A =Ta,Tb)

A series of inorganic yellow pigments with general formula Y_(4-x)A_xMoO_(9+δ)(A = Ta, Tb), where x = 0,0.05,0.1,0.2, 0.4 for Ta and χ = 0, 0.005, 0.01.0.03, 0.05 for Tb,were synthesized by a conventional ceramic method at 1400 ℃ for 6 h in air. The samples were characterized by XRD,EDS,XPS,SEM,TG-DSC,UV-vis-NIR reflectance spectroscopy and CIE L*a*b* color scales. It is found that the substitution of A(A = Ta, Tb) for Y~(3+) in Y_4 MoO_9 decreases the NIR reflectance of the pigment samples, but the developed pigments Y_(4-x)A_xMoO_(9+δ)(A = Ta, Tb) still exhibit impressive NIR solar reflectance. The brighter yellow color of inorganic pigments Y_(4-x)A_xMoO_(9+δ)(A = Ta, Tb) is available when x is about 0.1 for Ta and 0.01 for Tb. The results make them a series of potential candidates as ecological yellow pigments because of their high reflectance, lightness, intense coloration and excellent thermal and chemical stability.     

连铸板坯快冷试验分析Q345D包晶钢板坯角部横裂成因和工艺改进

通过对220 mm包晶钢板坯进行在线快冷试验,取冷却后板坯角部样,进行热酸浸及金相分析。从零段到矫直段的角样结果表明,角部横裂纹在矫直段内弧出现,随着板坯从结晶器往后延伸,奥氏体晶界的铁素体膜不断增厚,晶界越清晰,奥氏体晶粒度尺寸1.0～1.5 mm。由于奥氏体晶粒粗大,并且奥氏体晶界铁素体膜脆弱,矫直段铸坯角部温度偏低,进入第Ⅲ脆性区后,导致角部横裂沿着晶界展开。通过结晶器窄面水量由原30～32 m³/h增加至34～36 m³/h,关闭矫直段内弧边部喷嘴,使板坯角部横裂得到有效控制。     

热轧油泥在线气浮除油中试研究

介绍了气浮工艺的除油原理,利用5 m^3/h中试装置进行了在线热轧油泥除油试验,包括气浮试验、气浮加药试验和二次气浮试验。试验结果表明:在吸气量为1.5 L/min时,回流比15%、气液比12.5%、气体压力0.5 MPa的条件下,气浮除油效果最好;加药和二次气浮可以进一步提高除油率;在线气浮可以实现热轧油泥除油后含油率≤5%的回用标准。大生产应用可行性分析表明:中试试验参数可应用于生产实际且效果更好,投资回收期约为1.5年。     

Characterization,Mechanism and Control Measures of V Segregation in Continuous Casting Billet of C-Mn Steel

Metallurgical and Materials Transactions B - To eliminate V segregation, which significantly deteriorates the homogeneity of continuous casting steel billets, V segregation in the C-Mn steel billet...