高分子

Quinoxaline; thiophene; heterocycle ; conjugated polymers; electrochemical synthesis; solid-state phase reaction synthesis

工程科技I，化学，高分子化学喹喔啉；噻吩；杂环；共轭聚合物；电化学合成；固相合成

OBJECTIVE: To discuss the application of PTC polymer in radio-frequency thermofusion device.

目的：探讨PTC高分子材料在射频热封合器械中的应用。

Many industrial multiversities and specialist colleges have been established, strengthening some incomplete subjects and establishing new specialties, e.g., automation , atomic energy , energy resources , oceanography , nuclear physics , computer science , polymer chemistry , polymer physics , radiochemistry , physical chemistry and biophysics . A project for creating 100 world class universities began in 1993, which has merged 708 schools of higher learning into 302 universities.

同时，中国的高校还开设了许多新的学科，比如自动控制，原子能，能源，海洋学，核物理，计算机科学，高分子化学，高能物理，放射能化学，物理化学和生物物理学。1993年，中国的高等教育主管部门开始了一项名为创造100所世界级的中国大学的工程，把原有的708所大学合并为现在的302所综合性大学。

Because of the excellent radiolucent of carbon materials in the X-ray, the carbon implant or fixation frame can be evaluated easily by clinical X-ray photography and CT scan techniques that are helpful for patients.

与传统金属和高分子材料相比，碳材料在生物相容性、强度、重量、稳定性、加工性、实际操作上具有突出的优势。

The concise view leads to reclassification of protein structures.

本文致力于比较蛋白质主链的β-折叠片拓扑，识别侧链的组合，并将结构的运动性引入二级结构和构象，且用智能高分子催化剂来模拟酶活性部位的涨落。

Dendrimers,which have hyperbranched, well defined and monodisperse structures, can be formed by reiterative reaction sequences starting from smaller molecules named " initiator core ".

树枝状大分子是一种特殊结构的新型高分子，具有高度支化、结构规整、单分散等独特的结构。

By employing such a method, 5 series of elastomers, including natural rubbers, elastomeric polyester fibers and ethylene-octene, ethylene-methyl acrylate as well as SIS triblock copolymers, were investigated with the purpose of studying elongation induced phase structure and mobility changes of the samples. For NR samples, it was demonstrated that there exists a small amount of crystals at RT even for unelongated samples. For both NR and the soft segment of PEE, with the increase of elongation ratio, the elongation-induced crystallinity increases almost linearly in a certain region of R, in accord with the increase of the lamellar thickness of the crystals; The behavior of ethylene copolymers, in terms of elongation induced morphorpholgy changes, are quite different from NR and PEE. The crystals are found to be gradually destroyed with the increase of R, with accord with the decrease of the lamellar thickness; The motional behavior of the soft segment of SIS, changes from "liquid" to "solid", in terms of 13C NMR spin-lattice relaxation.For many of the aformented samples, the dependence of 13C spin-lattice relaxtion time T1 on R are different for different groups, indicating that the changes of mobility at MHz frequency region with elongation are different for different groups.

通过对天然橡胶、聚醚酯嵌段共聚物、乙烯-辛烯共聚物、乙烯-丙烯酸甲酯共聚物、SIS等高分子弹性体样品聚集态结构和分子运动的研究，获得了一些新的实验结果，如：给出了确切的实验证据，证明了室温下未拉伸的天然橡胶样品中存在着微量的结晶；发现随着拉伸比增加，天然橡胶及聚醚酯样品的软段部分会出现拉伸诱导的结晶，且结晶度在一定范围内呈现近似线性的增加，所形成晶片的厚度也随之逐渐增加；而乙烯共聚物随着拉伸比的增加，原有的结晶会被逐渐破坏，晶片厚度逐渐变薄，结晶中的缺陷逐渐增加；随着拉伸比的增加，SIS中PI软段部分的核磁共振弛豫行为会出现从液态到固态的转变等；在对上述多个体系的研究中，还发现不同基团的自旋-晶格弛豫时间随着拉伸比呈现不同的变化趋势，表明不同基团的高频运动随拉伸比增加有不同的变化规律。

Our results provided the theoretical foundation of spontaneous magnetization in fractal magnetic polymer chains, and the key factors that influence the critical temperature and the magnitude of remanence.

我们的研究提供了二维和三维分形磁性高分子存在自发磁矩的理论根据，得到影响临界温度、剩磁大小的关键因素。

Adopting the riblet structure of sharkskin as a templet, two ways of micro-replication, replicated moulding and electroforming, were used to replicate the microstructure on the surface of a polymer.

以鲨鱼皮表面的盾甲鳞结构为模板，采用复型翻模法和电铸法，在高分子表面进行表面微结构的复制。

Dopting the riblet structure of sharkskin as a templet, two ways of micro-replication, replicated moulding and electroforming, were used to replicate the microstructure on the surface of a polymer.

bstract 以鲨鱼皮表面的盾甲鳞结构为模板，采用复型翻模法和电铸法，在高分子表面进行表面微结构的复制。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。