菘蓝组织培养及植株再生研究

本实验通过对菘蓝(Tsatis Japanica）的六种外植体进行培养并诱导分化，研究了不同的外植体在相同培养条件下器官分化的不同状况并以分化周期最短、分化频率最高的根外植物为实验材料，通过改变外源激素的配比和浓度，以及其池培养条件的变化来控制外植体定向分化．对培养根段中不定芽的发生途径，做了完整的组织学和扫描电镜观察，并用不定芽做了人工种子的包埋，初步进行j，菘蓝人工种子的研究。

Improving performance of polymer photovoltaic devices using an annealing-free approach via construction of ordered aggregates in solution

Low crystalline order has been proved to be one of the main hindrances for achieving high performance devices based on thin films composed of crystallizable polymer. In this work, we use a facile method to substantially improve crystallinity of poly(3-hexylthiophene) (P3HT) in its pure or composite film via the construction of ordered precursors in the solution used for thin film deposition. These improvements have been confirmed by bright-field transmission electron micrography, electron diffraction, UV-Vis absorption and wide-angle X-ray diffraction.

Relating the molecular structure and crystallization behavior of polypropylene

The crystallization behavior of two polypropylene (PP) resins as used for biaxially oriented polypropylene (BOPP) and general injection mold applications, respectively, has been intensively investigated and compared by means of polarized light optical micrography (POM), differential scanning calorimetry (DSC), conventional transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM). It is found that both molecular weight distribution and isotacticity of polypropylene strongly affect its crystallization characteristics, e.g., the number of crystal nuclei at the initial stage, crystallization dynamics, the morphology, size and perfection of crystals in the final product, and so on. The results indicate an appropriate molecular structure is vital in producing high-quality BOPP film.