介绍了N,N-二烯丙基缩水甘油基胺(DAGA)作为阴离子开环聚合反应的单体的首次应用。使用表氯醇和N,N-二烯丙基胺以一步法获得单体。制备了由聚乙二醇和聚N,N-二烯丙基缩水甘油胺组成的无规共聚物和嵌段共聚物,其DAGA比例调整为2.5%到24%,得到了具有良好定义的低多分散度(M w / M n)的材料。范围1.04–1.19。分子量范围为2600至10300 g mol –1。已经实现了在聚合过程中根据时间,温度和抗衡离子将烯丙胺异构化为烯胺结构。使用时间分辨的1 H NMR测量结果和13C NMR三联体序列分析。在EO和DAGA的同时共聚过程中揭示了单体掺入的锥形特征。已经研究了共聚物在本体和水溶液中的热行为,揭示了LCST在29–94°C的范围内。通过威尔金森催化剂介导的双键异构化和随后的酸性水解,定量去除保护基团,得到具有锥形或嵌段结构的多氨基官能团PEG共聚物。通过用乙酸酐衍生
Thickener composition and method for thickening aqueous systems
申请人:Bobsein Barrett Richard
公开号:US20100076145A1
公开(公告)日:2010-03-25
A polymer composition with blocks of hydrophobes attached to or within the backbone of an associative thickener. The blocks are composed of two or more units of the same or different hydrophobes whereby the hydrophobe is reversibly switched between being hydrophilic and hydrophobic in nature. When the hydrophobe is rendered hydrophilic, the aqueous thickener is pourable and readily incorporated into aqueous polymer compositions. When this hydrophobe is rendered hydrophobic, the thickener performs its thickening function efficiently, especially in tinted systems. Switching is readily accomplished by adjusting the pH of the associative thickener composition and the aqueous polymer composition being thickened.
Functional polymers derived from polyamines and process for producing the same
申请人:NITTO BOSEKI CO., LTD.
公开号:EP0294506A1
公开(公告)日:1988-12-14
A functional resin derived from a polyallylamine or polyvinylamine and having unsaturated C=C bonds such as allyl groups at terminals of side chains has good coating properties and strong adhesiveness to a substrate, thus can be used as protective films for various substrates, coating compositions and adhesives.
Das Polymerisationsprodukt einer quaternären Ammoniumverbindung der Formel
worin R C₁-C₃-Alkyl und
Q⊖ ein C₁-C₃-Alkylsulfation oder das Anion einer aromatischen Sulfonsäure bedeuten, welches durch Umsetzen von 1-Diallylamino-2,3-epoxypropan mit einem Sulfonsäurealkylester der Formel
(2) Z - SO₂ - OR
worin Z einen Arlyrest oder -OR bedeutet und R die angegebene Bedeutung hat, und Polymerisation der erhaltenen quaternären Ammoniumverbindung der Formel (1) hergestellt wird.
Das Polymerisationsprodukt enthält praktisch kein Dihalogenpropanol wie Dichlorpropanol und eignet sich insbesondere als Retentionsmittel oder Nassfestmittel bei der Herstellung von Papier und vor allem für die Nachbehandlung von gefärbtem Cellulosefasermaterial.
式中的季铵盐化合物的聚合产物
其中 R 为 C₁-C₃ 烷基,且
Q⊖ 是 C₁-C₃-烷基硫酸根离子或芳香族磺酸阴离子,它是由 1-二烯丙基氨基-2,3-环氧丙烷与式中的烷基硫酸根反应而得
(2) Z - SO₂ - 或
其中 Z 为芳基或 -OR,R 具有所述含义,然后将得到的式 (1) 季铵盐化合物聚合。
聚合产物几乎不含二卤丙醇(如二氯丙醇),特别适合用作纸张生产中的滞留剂或湿强剂,尤其适合用于染色纤维素纤维材料的后处理。
Polysaccharide modification in densified fluid
申请人:National Starch and Chemical Investment Holding Corporation
公开号:EP0893451A2
公开(公告)日:1999-01-27
This invention relates to a process for chemically modifying polysaccharides in a densified fluid. In particular, the modification includes esterification and/or etherification of a starch in supercritical carbon dioxide. The process is advantageous in that it allows for a high degree of substitution without the use of organic solvents or repeated reactions.
Disclosed are an 8-arm polyethylene glycol (PEG) derivative (formula 1), manufacturing method and modified bio-related substance thereby, wherein a tetravalent group U and four trivalent groups Ec form a highly symmetric octavalent central structure CORE0 together, Lc connects the octavalent center to eight PEG arms having polydiversity or monodiversity and having n1-n8 as the degrees of polymerization thereof. The terminal of one PEG chain is connected to at least one functional group F (k ≥ 1), and said PEG chain and F can be directly connected (g = 0) or connected with a divalent linking group L0 connected with a terminal branched group G (g = 1) therebetween. The latter provides more reacting sites to combine more pharmaceutical molecules, thereby increasing the drug loading capacity. The near-center symmetric structure of the derivative allows more precise control over the molecular weight during large-scale production, thereby facilitating acquisition of a product having a narrower molecular weight distribution. A bio-related substance modified thereby has a more uniform and controllable performance.