Synthesis and Characterization of Short-Chain Branched Polyethylene with Controlled Structure 结构可控短链支化聚乙烯的合成与表征
Some polymer with a branched chain, known as the branched-chain polymers, are linear structure. 有些高分子带有支链,称为支链高分子,属于线型结构。
Branched structure of macromolecular chains 高分子链的支化结构
The results revealed HP I was a kind of highly branched structure. 分析结果表明:HPⅠ为多分枝结构;
Simulation results indicate that the bi-level branched channel structure, horizontal extending ranges and maximum vertical electric field changes are in good agreement with the corresponding observed data. 得到的云闪双层、分叉通道结构,通道的水平和垂直延伸范围以及放电前后最大垂直电场变化值与观测的相应结果有更合理的一致性;
Japonicus by applying the method of histology. The result indicated that the A. japonicus started to regenerate immediately after the evisceration, and the respiratory tree trunk and the branched structure were observed on the 2nd day. 采用组织学方法对刺参吐脏和再生过程进行观察,结果表明,刺参吐脏后便开始再生,吐脏后的第2天可观察到呼吸树主干及分支结构。
Detection of Various Branched Structure Units in High Polymers by Carbon-13 NMR 用C-13核磁共振谱测定高聚物中微量异种结构单元的探讨
Their inherent viscosity was low and solubility was high, consistent with a highly branched structure. 所有聚合物都具有粘度低、溶解性好的特点,这与它们高度支化的结构有关。
Two-dimensional carbon fibers ( TDCF) with branched tree structure were prepared by two-stage horizontal floating catalyst method. 采用两段加热卧式浮动催化法合成了二维树状分叉碳纤维。
4) Three weeks later, some runner hyphae stopped elongation and formed a ball at the tip, under which ramified some septal hyphae, among which some formed branched absorbing structure ( BAS). 4)培养3周后,双重培养的部分厚壁菌丝顶端膨大成球形并停止生长,其下产生有横隔的分支菌丝,有的分支菌丝形成典型的分支吸收结构(BAS);
The rheological characteristics of branched polymers, as well as the effects of molecular structure and temperature on them, were reviewed in this paper. 从支化聚合物的流变特性表征以及分子结构和温度对其流变行为的影响三个方面综述了支化聚合物的流变特性。
Preparation of two-dimensional carbon fibers with branched tree structure by floating catalyst method 二维树状分叉碳纤维的浮动催化法制备
The low angle thrust fault at section bottom branched forward in piggy-back thrusting style, in the west of anticline they become imbricated thrust structure; in the east of anticline they become antiformal duplex structure. The south of Junggar basin; 背斜深部的低角度逆冲断层以‘前展式’向前分支,在背斜西段形成叠瓦状推覆构造,在背斜东段形成堆垛式双重构造。
And the branched structure caused an early transition of the separated domain from the sphere-like to the rod-like, which was interpreted theoretically through a thermodynamic model. 支化结构使分散相区域从球状向棒状形式的相变点提前,通过热力学模型分析,对这一现象进行了理论解释。
The 1H NMR spectrum of our end product branched PEG tallies with its structure. 最终产物分枝型PEG的1HNMR的表征结果与其结构吻合。
The Design of Branched Structure of Water Supply And Power Station Tunnel with Concrete Lining in Fenhe Reservoir ⅱ 汾河二库供水发电洞混凝土岔洞结构设计
The result showed that Y-type branched carbon nanotubes were formed together with metallic catalytic particle existing at their turning points, so that seven-unit cyclic topological defect appeared in the system and the Y-type branched structure formed consequently. 研究结果显示,Y型碳管在其拐点处存在催化剂粒子,由于催化剂的作用,在体系内产生了七元环拓扑缺陷,进而形成Y型分叉结构。
Effect of long chain branched structure for isotactic polypropylene on crystallization behaviors 长支链结构对等规聚丙烯结晶行为的影响
Poly ( methyl methacrylate) branched chain in MG molecule structure was destroyed when thermal and oxygenous aging. MG分子结构上的显著变化是聚甲基丙烯酸甲酯支链破坏,热稳定性取决于接枝物结构及其热性能。
The study showed that the as prepared PAM had long branched chain and comb structure. 研究表明:成功合成了具有长支链和梳型结构特点的两性聚丙烯酰胺。
The branched chain structure surfactants had higher surface activity and interfacial activity than linear chain structure surfactants. 相对于直链结构的表面活性剂,支链结构的表面活性剂具有较高的表面和界面活性。
The use of formaldehyde can increase the microporous structure by enhancing the degree of branched structure of macromolecular chains. 甲醛的使用,使分子链的复杂程度加深,分子链支化程度提高,微孔结构增加。
Branched polymers have unique structure. There was less entanglement between molecular chains. Thus branched polymers showed novel performances: good solubility, low melting point and solution viscosity, and lower mechanical properties. 支化结构的聚合物因其独特的结构,与线型聚合物相比,难以发生分子间缠结,因此具有良好的溶解性、较低的熔点和溶液粘度以及较低的机械力学性能。
The foundation pit branched care more structural type, with the development of the main building structure design, especially the diversification trend of the underground structure, a single support structure of the program can not meet the design requirements of the foundation pit of special projects. 基坑工程中支护结构型式较多,随着建筑物主体结构设计的发展,特别是地下结构形式的多样化趋势,单一的支护结构方案无法满足特殊工程基坑围护设计的要求。
Based on it, key elements to identify the branched structure and loop structure are given in this paper. During traversal, the branch structure is marked, according to the characteristics of the branch structure. 在此基础上,论文给出了识别分支结构、循环结构的关键要素,针对分支结构的特点,在遍历过程中对分支结构做相应的标记。
The hyper-branched polyesters have highly branched 3D structure and a large number of reactive end groups, they could obtain much different properties by end-modified. 超支化聚合物具有高度支化的三维结构和大量的活性端基,可以通过端基改性以获得不同性能。
The branched structures of macromolecular chains make the micropore and the structure the polymer monomeric unit supports forms the macroporous and mesoporous structure. 聚合物分子链的不断支化,使链间形成微孔结构,聚合物单体单元支撑起来的结构形成中大孔结构。
Hyperbranched polymers are a new functional polymer materials which have highly branched structure, good-solubility, low viscosity and high chemical reactivity. 超支化聚合物是一种具有高度支化结构、良好溶解性、低粘度以及较高化学反应活性的新型功能高分子材料。
Hyper branched polymer had novel structure and unique properties, introducing hyper branched structure into polyimide was an effective way to improve the solubility. 超支化聚合物由于独特的分子结构具备特殊的性能,利用超支化结构改善聚酰亚胺的溶解性是一种有效的途径。