含吡咯烷酮基丙烯酸酯类单体的合成及聚合

轻度交联的聚甲基丙烯酸2-羟乙酯(HEMA)是众所周知的医用水凝胶,即所谓的“Hvdron”。但其吸水率一般在59%(EWC为37%),并不尽人意。近年来,为了提高这类水凝胶的亲水性及生物相容性,常用一些亲水性的烯类单体进行表面改性或通过共聚以达到此目的,N-乙烯基吡咯烷酮是较为常用的这类单体之一。本文合成了含吡咯烷酮基丙烯酸酯类的单体,即丙烯酸2-N-吡咯烷酮基乙酯(PyEA),甲基丙烯酸2-N-吡咯烷酮基乙醋(PyEMA),并研究了这两种单体在甲基丙烯酸二甲氨乙酯(DMAEMA)与过硫酸钾(KPS)所组成的氧化还原引发体系下的聚合。     

含吡咯烷酮基丙烯酸酯类单体的合成及聚合

2-N-Pyrrolidonoethyl acrylate(PyEA) and 2-N-pyrrolidonoethyl methacrylate (PyEMA) were synthesized by reaction of N-2-hydroxyechyl pyrrolidone with corresponding acryloyl chlorides in the presence of triethylamine. The polymerization of PyEA, PyEMA were carried out at 40℃, using N,N-dimethylaminoethyl methacrylate(DMAEMA)-potassium persulfate (KPS) system as an initiator. Kinetic study showed that the rate equation of polymerization (Rp) could be expressed:Rp = Kp[DMAEMA]^0.5[KPS]^0.5[PyEA] orRp= Kp[DMAEMA]^0.5[KPS]^0.5[PyEMA] The overall activation energy for the polymerization was estimated to be 44.9 KJ/MOL,52.7 KJ/mol for PyEA or Py EMA respectively.     

由含吡咯烷酮基丙烯酸酯类所得水凝胶的性质

由含吡咯烷酮基丙烯酸酯类所得水凝胶的性质于淑艳，潘捷，李旺金，李福绵（北京大学化学系北京１００８７１）关键词丙烯酸２－Ｎ－吡咯烷酮基乙酯，甲基丙烯酸２－Ｎ－吡咯烷酮基乙酯，水凝胶，平衡吸水率，释放行为水凝胶作为生物材料的一个重要分支而备受瞩目，尤其是...