塑料铰链联接的设计

介绍了一种常用的塑料联接——铰链联接所用的材料、设计要点、基本类型、工作原理及典型的塑料铰链实例。阐述了铰链联接在制品设计、模具设计上的特点及其在实际使用上的优越性。     

自增强型热塑性塑料

PE、PP等通用塑料应用用途广泛 ,通常用来加工简单的制件和轻质制件 ,与人们日常工作、生活密切相关。它们共同的缺陷是机械强度低 ,尤其是弹性弯曲模量偏低。因而在生产有高机械性能要求的结构部件时 ,往往需要采用纤维增强复合材料加工成型。目前常用的纤维增强复合材料加工方法是 ,在某种聚合物基体材料中加入切断的玻璃纤维或天然植物纤维增强两种方法。如果需要更进一步提高材料的机械性能 ,则需改变纤维的长度、形状。由此导致制件重量明显加大 ,难于加工成型和回收处理。　　某种材料如果仅有高的机械性能 ,并不能满足其它各项要求…     

铰链罩注射复杂部位的结构设计

本文通过一体积较小而内腔结构复杂的汽车铰链罩注射模复杂部位的结构设计实例，突出说明了斜滑块抽芯机构和斜导柱抽芯机构在注射模中的重要作用。     

弹性铰链用橡胶的研究

本文重点讨论了橡胶补强剂（天然气槽法炭黑和白炭黑）的变量对橡胶综合性能的影响。     

塑料联接件的设计制造和使用

介绍常用塑料铰链联接，搭扣联接，卡夹联接，压力装配联接的联接件材料选择，成型方法，联接原理，形状设计等。     

塑料激光成型新技术

研究和探讨了塑料激光塑性成型的成型机理、变形方向控制。阐述了该成型方法的特点、影响因素及材料特性。并介绍了成型实例。     

塑料窗的制造工艺

PVC塑料窗装配加工成型过程中，绝大部分需要切削加工的部分都在焊接工序之前完成。这些切削加工是在单根PVC塑料型材上进行，加工比较方便。框、扇焊接成型后，主要进行装配工作，包括分格型材的装配(全焊接方案除外)，装配密封条、五金配件、玻璃，总检，包装等。     

New Molecular Wires with Two Ferrocene Hinges

Conventional molecular wires of the oligophenyleneethynylene (OPE) type are two-dimensional rigid molecules of fixed length. Possible problems concerning π,π stacking and device geometry associated therewith might be overcome by replacement of some of the 1,4-phenylene moieties by 1,1′-disubstituted ferrocene units. These make the wire three-dimensional thereby reducing the likelihood of intermolecular π,π interactions and serve in addition as hinges as a result of the almost free rotation around the Cp-Fe-Cp axis. This feature provides a limited conformational flexibility with the possibility of a length adjustment comparable to a foldable ruler. Here the syntheses and some physical properties of molecular wires containing two ferrocene hinges are described. In a number of cases the Sonogashira coupling reactions used for the coupling of the respective building blocks proceed much faster under microwave irradiation as compared to conventional heating. This paper is dedicated to Professor Didier Astruc in honor of his pioneering research efforts and accomplishments in the field of organometallic materials.     

Comparison of Glass Vessels and Plastic Bags for Enclosing Living Plant Parts for Headspace Analysis

Plants release volatile chemicals into their surrounding air space that can affect the physiology of neighboring plants and influence the behavior of insects. In studying these interactions, it is desirable to collect volatiles from plants that have not been excised and are growing under as natural conditions as possible. We compared a vessel of borosilicate glass and Nylon-6 or polyester [poly(ethyleneterephthalate) or PET] cooking bags for enclosing plants during collection of volatiles. A push–pull airflow system was used, and volatiles were trapped on Tenax TA and analyzed by gas chromatography after thermal desorption. Low levels of impurities were found for the glass vessel and polyester bags. Nylon bags contained higher levels and more impurities. Recoveries of standards of 10 plant volatiles were measured in static and dynamic systems. In a static air system, there was good recovery only from the glass vessel. In a dynamic system, there was generally good recovery from both the glass vessel and polyester bags. Recoveries of α-pinene and (Z)-jasmone were poor throughout. The former was shown to have a very low breakthrough volume on the Tenax TA adsorbent, and the latter may be strongly adsorbed on glass. All three materials were essentially transparent in the IR and visible (photosynthetic) range but with significantly different absorptions in the UV range. In a simulated dynamic entrainment in full sunlight, internal vessel temperatures were higher than ambient by up to 9.5°C in the glass vessel and 7.5°C in the polyester bag. Lower increases in temperature relative to ambient (<1°C) were recorded when entrainments were conducted in the shade. In a field trial, the profiles of volatiles collected from an apple tree infested with rosy apple aphid using a glass vessel and a polyester bag were similar. Polyester bags are recommended as more convenient than glass vessels for the enclosure of plants during the collection of volatiles.     

Polar Hinges as Functionalized Conformational Constraints in (Bi)cyclic Peptides

Two polar hinges for cyclization of peptides have been developed, leading to bicyclic peptides and cyclized peptides with improved solubility and biological activity. Increasingly, we note that a good aqueous solubility of peptides is an absolute prerequisite, not only to allow handling and purification of our target peptides but also being crucial for biological activity characteristics. Compared to earlier hinges, the 1,1′,1“‐(1,3,5‐triazinane‐1,3,5‐triyl)tris(2‐bromoethanone) (TATB) and 2,4,6‐tris(bromomethyl)‐s‐triazine (TBMT), each containing three nitrogen atoms are structurally similar but chemically very different. Both were accessible in a one‐step fashion from bromoacetonitrile. TATB and TBMT are very suitable for the preparation of more soluble bicyclic peptides. Azide‐modified TATB and TBMT derivatives provide hinges for the preparation of cyclized peptides for incorporation on scaffolds to afford protein mimics.     

生长的种子

张小川的设计颠覆了大多数人对首饰的理解,你会感觉到大自然的一切像一颗颗种子在心底生根发芽,那种新生的力量闪烁着独特的光芒。     

生长的种子

张小川的设计颠覆了大多数人对首饰的理解,你会感觉到大自然的一切像一颗颗种子在心底生根发芽,那种新生的力量闪烁着独特的光芒。     

魅力塑料

这光艺术雕塑由知名新加坡艺术家SunYuLi发起建成,他将美感和城市可持续发展理念带给新加坡人心中。这座艺术品由3000个再生塑料杯瓶与LED灯     

魅力塑料

米兰2011春夏时装周上JilSander用利落的剪裁和碰撞饱和的色彩,让我们惊叹大师的功力,不过让人们眼前一亮的却是模特手中的塑料袋!没有任何的不协调和廉价感,反而摩登到了极致。     

全塑型聚氨酯塑胶地板的制备

详细介绍了全塑型聚氨酯塑胶地板的制备、主要原材料的选择及其影响因素。该塑胶地板通过引进复合阻燃剂，使制品的阻燃等级达到了1级；通过引入纳米材料，在提高制品耐磨性能的同时，大大提高了其抗污性能。