矾土中钾、钠、硅、铁、钙、镁、钛的ICP-AES测定

以碳酸锂-四硼酸锂为熔剂,铝矾土试样经高频融样机高温熔融。熔融物在PTFE烧杯中,用稀盐酸加热溶解。样品溶液使用电感耦合等离子体原子发射光谱仪测定,结果准确度高、重复性好。     

固相法合成钛榍石的研究

通过正交实验法、X射线衍射分析等手段,研究了钛榍石的固相反应。结果表明:合成钛榍石的最佳温度为1260℃,保温时间为30min,最佳配方比例为CaCO3∶TiO2∶SiO2=40.70∶34.27∶22.03,其乳浊效果达到了硅酸锆的效果,并讨论了合成钛榍石的影响因素。     

采用Z-N/茂金属复合催化剂制备PP釜内合金

制备了Ziegler-Natta/茂金属(Z-M)复合催化剂,用Z-M复合催化剂采用一段丙烯本体均聚合、二段乙烯-丙烯气相共聚合制备了聚丙烯(PP)釜内合金PPc-A.与采用传统Ziegler-Natta催化剂ZN118制备的抗冲聚丙烯釜内合金SP179对比,两合金具有相近的熔体流动速率及乙烯含量,但冲击强度相差较大....     

填料用氢氧化铝色度的研究

通过对影响填料用氢氧化铝色度的原因进行研究,得出金属杂质含量、氢氧化铝原料的粒度及分布是影响填料用氢氧化铝的白度和b值的重要因素。     

基于ASP平台的陶瓷企业ERP系统

主要介绍了陶瓷企业在ASP平台应用ERP系统的各个功能、主要创新点,以及我公司应用后取得的效果。     

Effect of styrene–acrylonitrile on the electrical resistivity of polycarbonate/multiwalled carbon nanotube composites

Multiwalled carbon nanotube (MWCNT)‐filled polycarbonate (PC)/styrene–acrylonitrile (SAN) blends with a wide range of blend compositions were prepared by melt mixing in a rotational rheometer, and the effect of SAN on the electrical properties of the PC/MWCNT composites was studied. The structure/electrical property relationship was investigated and explained by a combination of MWCNT localization and blend morphology. Transmission electron micrographs showed selective localization of MWCNTs in the PC phase, regardless of the blend morphology. When the SAN concentration was 10–40 wt %, which corresponded to sea‐island (10–30 wt %) and cocontinuous (40 wt %) blend morphologies (PC was continuous in both structures), the electrical resistivity decreased with increases in the SAN content. The concept of an effective volume concentration of MWCNTs was used to explain this effect. When the SAN concentration was 70 wt % or higher, the electrical resistivity was very high because MWCNTs were confined in the isolated PC particles. In addition, SAN was replaced by other polymers [polystyrene, methyl methacrylate/styrene, and poly(methyl methacrylate)]; these yielded similar blend morphologies and MWCNT localization and showed the generality of the concept of effective concentration in explaining a decrease in the electrical resistivity upon the addition of a second polymer. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.     

Inserting polyoxomolybdate cluster into poly(?-caprolactone) to create a class of new heteropolymer: Synthesis and supramolecular structures

In the present work, we report our work concerning the synthesis of heteropolymers of poly(?-caprolactone)-polyoxomolybdate-poly(?-caprolactone) using ring-opening polymerization (ROP) of ?-caprolactone monomer initiated by two hydroxyl groups attached on the two sides of a polyoxomolybdate cluster which was organically modified using pentaerythritols. Since the hydroxyl groups on polyoxomolybdate macroinitiator are less reactive, ring-opening polymerization were finally carried out by using 4,4′-(dimethylamino) pyridine to activate ?-caprolactone monomer. The polyoxomolybdate-containing heteropolymers were confirmed in detail by ¹H NMR, FT-IR, GPC, TGA and XPS methods. Although the size of polyoxomolybdate cluster is extremely small compared to PCL chains, it was also found that POM played an important role in crystallization process. Self-assembly of such heteropolymers in mixed solvents were investigated and the analysis of formed spherical aggregates with multiple concaves on the surface was supported by TEM results and 3D electron tomography.     

Dynamically confined crystallization in a soft lamellar space constituted by alternating polymer co-brushes

Crystallization kinetics and behavior of PCL side chains in polymer co-brushes constituted with PCL and PEO side chains alternatively attached on poly(styrene-alt-maleimide) backbones have been determined using in-situ FT-IR and DSC methods. Avrami analysis shows the exponent n increasing from one at 10 °C to two at 30 °C, demonstrating confined crystallization of PCL side chains through homogeneous or heterogeneous nucleation. PLM morphological characterization displays typical spherulites of which size is dependent on the crystallization temperature and further AFM visualization shows typical PCL lamellae at 30 °C and broken lamellae at 10 °C embedded within PEO + backbone matrix inside of spherulites. Such lamellar structure explains the confined crystallization with Avrami exponent n ≤ 2. Formation of the broken lamellae can further clarify the reason why Avrami exponent decreases to n ≈ 1 at 10 °C, that is, homogeneous nucleation in the isolated crystals. Dynamically confined crystallization has been proposed based on their special molecular architecture. Comparing to statically confined crystallization, the construction of confined space and the crystallization process were almost synchronous. The formation of spherulites mesoscopically reveals the entire molecule motion and assembly through a pathway of conventional crystalline polymers and the crystallization of PCL side chains in a space constituted by stiff backbones of poly(styrene-alt-maleimide) plus soft PEO layer microscopically reflects a confined character which has been observed in some conventional block copolymers.     

高固含量环氧改性磺酸盐型水性聚氨酯的合成与表征

以异氟尔酮二异氰酸酯(IPDI)、六亚甲基二异氰酸酯(HDI)、聚己二酸-1,4-丁二醇酯(PBA)为主要原料,以1,4-丁二醇为小分子扩链剂,以乙二胺基乙磺酸钠为亲水性扩链剂,并用环氧树脂E-51作为改性剂,得到固含量为50%的环氧树脂改性磺酸盐型水性聚氨酯乳液SWPU-E。实验研究了环氧用量对乳液的粒径及其分布和对胶膜力学性能的影响;实验还采用红外、核磁、热重分析等方法对胶膜的结构和热稳定性等进行了深入的分析。结果表明:环氧树脂的羟基和环氧基团参与了反应,生成了环氧改性的水性聚氨酯结构;随着环氧用量的增加,乳液的平均粒径从95.8 nm增加到169 nm,粒径分布变宽;胶膜的拉伸强度随之变大,当环氧用量低于4%时,拉伸强度明显增加,由16.21 MPa增加到43.7 MPa,之后拉伸强度增加缓慢;胶膜的热稳定性随环氧用量的增加得到明显提高,初始分解温度、转折点温度、分解终点温度均朝高温方向移动。     

高氟碘溶液中脱氟工艺实验研究

探讨了一种含碘溶液的除氟工艺,添加钙盐和铝盐是处理600~750 mg/L的高氟碘溶液的有效方法,通过设计正交实验得出了富碘溶液脱氟的最优工艺条件,在pH为7左右,铝盐量为50 g/L,钙盐量为5 g/L,静置时间为3 h的条件下,碘溶液的氟含量能降到10 ppm以下。