甲基丙烯酸C_7～C_9酯的基闭转移聚合

研究了甲基丙烯酸Ｃ_７～Ｃ_９酯的基团转移聚合。聚合必须在８０℃以上进行，讨论了聚合条件对聚合速率、分子量、分散性及转化率的影响。     

柠檬酸镧的合成及其对SBR橡胶硫化性能的影响

以氯化镧和柠檬酸为原料,合成柠檬酸镧,探究反应条件对柠檬酸镧产率的影响,得到反应体系p H值4~5之间,柠檬酸与氯化镧的摩尔比1.2∶1,反应体系温度50℃为较优的反应条件。并将合成的柠檬酸镧添加到SBR混炼胶中,研究其对混炼胶的硫化特性和硫化胶物理机械性能的影响;结果表明,添加2.5%的柠檬酸镧可使混炼胶的硫化速率t90达到943 s,比未添加柠檬酸镧的快了31 s,当添加量为7.5%时硫化胶的物理机械性能达到最佳,比未添加相比提高了将近50%。通过红外光谱表征产物结构,并采用硫化仪、万能试验机对混炼胶进行硫化性能及物理机械性能测试,研究结果表明,柠檬酸镧可提高混炼胶的硫化性能、硫化胶物理机械性能及抗硫化还原性。因此,柠檬酸镧可以作为SBR橡胶硫化剂的一种补充。     

芳氧端基的聚二甲基硅氧烷

通过酚类与六甲基环三硅氧烷（Ｄ３）的调聚反应，首先合成了一类含芳氧端基的聚二甲基硅氧烷（ＡＯＳ）．采用ＵＶ、ＩＲ、１ＨＮＭＲ、元素分析、分子量测定等方法，确证了所合成聚合物的结构．讨论了反应试剂摩尔比和反应条件对调聚产物分子量的影响；研究了ＡＯＳ的结构与杀菌功能、絮凝作用以及水解速度的关系．     

AgIO_3 Composited with m-BiVO_4 as Enhanced Visible-light Heterojunction Photocatalysts for the Elimination of Aqueous Organic Pollutants

The heterojunction strategy was used to overcome the drawbacks of AgIO_3 for its wide band gap and of BiVO_4 for its low charge-separation efficiency. The photocatalytic per-formances of the as-prepared AgIO_3/BiVO_4 were assessed by the photodegradation of rhodamine B(Rh B) and tetracycline hydrochloride antibiotics(TC) under visible-light irradiation. All the as-prepared samples showed remarkable enhanced photocatalytic efficiency than pure AgIO_3 and BiVO_4. Especially, 40% AgIO_3/BiVO_4 exhibited optimum photocatalytic activities among all the prepared samples. The improvements may be ascribed to the synergetic effect between AgIO_3 and BiVO_4 including matching potentials and effective charge separation. Radical trap experiments determined that h+ radical plays a significant role in the photodegradation of RhB while e-is not the dominating reactive species.     

BiIO_4 Nanoflakes for the Degradation of Phenol under Simulated Solar Light Irradiation

BiIO_4 nanoflakes were successfully prepared through a facile hydrothermal method. The as-prepared BiIO_4 was characterized by scanning electron microscope(SEM), high-resolution transmission electron microscopy(HRTEM), X-ray diffraction(XRD), energy-dispersive spectroscopy(EDS) and ultraviolet visible diffuse reflectance spectroscopy. BiIO_4 nanoflakes showed excellent photocatalytic activity for the degradation of phenol solution under simulated solar irradiation. The influence of synthesis temperature on the morphology, size and photocatalytic performance of BiIO_4 was investigated. BiIO_4 prepared under 140 ℃ exhibited the highest removal rate of phenol under simulated solar light irradiation. In addition, the parametric studies such as the effect of catalyst loading and phenol solution pH were carried out to optimize the reaction conditions. The active species trapping experiment demonstrated that h~+ and ·OH are the major active species during the photocatalytic process.     

甲基丙烯酸甲酯和联苯酯的基团转移共聚研究

研究了甲基丙烯酸甲酯（ＭＭＡ）和甲基丙烯酸联苯酯（ＢＰＭＡ）的基团转移共聚．用１Ｈ ＮＭＲ、ＩＲ、ＧＰＣ和ＤＳＣ等手段对共聚物进行了表征．测得两种单体在苯、四氢呋喃和乙腈中的竞聚率（３０℃）分别为γ１＝０５６±００３、０５２±００３、０４６±００３和γ２＝０７９±００３、０８１±００３、０８５±００３．得到了实测分子量和理论分子量相近，分散性较小的共聚物