查询词典 polyesters

The first and second generation of dendritic polyesters have been prepared by divergent synthetic ways using trimethylopropame as core and o-phthalic anhydride, glycidol as branched units.

以三羟甲基丙烷为核，邻苯二甲酸酐，环氧丙醇为支化结构单元，合成了第一及第二代树枝状聚酯。

A series of maleopimaric acid polyester amino resins were made from maleo￣pimaric acid polyesters crosslinked by etherified melamine formaldehyde resins.

以马来海松酸和线性小分子二醇为原料，合成马来海松酸聚酯多元醇，再用氨基树脂交联，制备马来海松酸聚酯氨基树脂。

Due to the increasingly deep concerns about the cytotoxicity of stannous octoate, which is the most widely used catalyst for synthesizing polyesters derived from lactides (L-LA, D, L-LA, GA) via ring opening polymerization, a lot of new metal complexes of relatively low toxicity including Schiff base–Al complexes, Red-Al were developed and used to initiate the living, stereo-specific, and/or stereo-selective ROP of lactides.

由于合成聚乳酸类生物医用降解材料的最常用的催化剂辛酸亚锡 Sn2的细胞毒性问题已在世界范围内引起日益深切的关注，近年来国内外学者已研究开发出许多性能优异的低毒、非锡金属络合物催化剂（如：位阻西佛碱-Al 络合物， Red-Al 等）用于催化交酯类单体的活性、立构专一性及立构选择性聚合反应。

Chiral 3 methy 1,4 butanediol and its derivatives are the important intermediate of synthesis of chiral smectic liquid crystal polyesters and chiral natrual products with biological activity. In the paper, a new efficient route of 3 methyl 1,4 butanediol and its two derivatives, 2 methyl 4 tetrapyranyloxy 1 butanol and 2 methyl 4 tetrapyranylbutanal, was described, and the target products were synthesized by employing asymmetric hydroboration oxidation improved.

手性2－甲基－1，4－丁二醇及其衍生物是合成各种手性近晶型液晶材料以及手性天然生物活性物质的重要中间体，以3－甲基－3－丁烯－1－醇为原料利用改进的不对称硼氢化－氧化反应，成功地合成了－2－甲基－1，4－丁二醇以及其2种手性衍生物：－2－甲基－4－四氢吡喃氧基－1－醇和－2－甲基－4－四氢吡喃氧基丁醛。

The invention relates to a method for manufacturing polyesters, in particular, to using a lithium titanyl oxalate as the catalyst for such reaction to provide fast reactions with excellent color properties for the resulting polyester.

本发明涉及一种制备聚酯的方法，尤其涉及采用钛氧基乙二酸锂作为此类反应的催化剂以加快反应，并使所得聚酯具有优良的色泽性能。

The present invention relates to processes for the production of purified, moderately esterified polyol fatty acid polyesters and the compositions derived from those processes.

用于制备适度酯化的纯化多元醇脂肪酸聚酯的方法和由那些方法制得的组合物。

Manufacturers are extruding advanced polyesters into fibers with a moisture content as low as0.5 percent, versus4 percent for nylon and6 to7 percent for cotton, so that they wick and dry more quickly.

这些厂商利用先进的聚酯化物，射出含水量只有0.5%纤维，比起尼龙的4%纯棉的6~%说，含水量少了很多，因此可以更迅速吸乾，有利于排汗。

Heat-sensitive materials like PVC, ABS, and EVOH, or engineering resins like acetals, PC, nylon, or polyesters are more likely to degrade than heat-tolerant polyolefins.

PVC、ABS和EVOH之类的热敏性材料或者POM、PC、尼龙或聚酯类的工程树脂比耐热性的聚烯烃更容易降解。

Sartomer unique polyesters and acrylated acrylics offer high performance on a cost-effective basis.

沙多玛独特的聚酯和丙烯酸丙烯酸提供了一个具有成本优势的高性能产品。

Polyesters are sometimes refereed to as oil-free alkyds.

通常情况下，聚酯也叫无油醇酸。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。