Introduction, modification, and characterization of functional groups on the surface of low-density polyethylene film
Introduction, modification, and characterization of functional groups on the surface of low-density polyethylene film
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DOI：
10.1021/ja00456a035
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发表时间：
1977-06
影响因子：
15
通讯作者：
J. R. Rasmussen;E. Stedronsky;G. Whitesides
中科院分区：
文献类型：
--
作者：
J. R. Rasmussen;E. Stedronsky;G. Whitesides
低密度聚晶石膜在25℃至75℃的浓铬酸液中初始氧化，然后在50℃下用70%的含水硝酸进一步氧化，生成含有相对较少的不同官能团的表面。用ATR-LR光谱和化学表征确定了这些官能团的结构和相对数目。表面官能团主要由碳化合物组成，其中约6Clx，Oi thcsc为羧酸基团，40‘b为kctoncs或aldchy’des。醇d，r不是SCCM到BC Prcscnt。使用两种独立的荧光技术，在表面上生成的羧酸基的绝对数约为2×10~(-5)/cm~(-1)。由于表面粗糙，碳的表面密度比这个数字低，因此需要几个步骤，它们使用碳酸基团作为表面化学修饰的基础。
Initial oxidation of low-density polycthytene film w'ith concentrated chromic acid solution at temperr,ur.Jbetwccn 25 and 75 oC, follovved by furthcr oxidation with 70% aqueous nitric acid at 50 oC, generatcs a surface containing a relativelr small numbcr of diffcrcnt tlpcs oi (unctional groups. The idcntities and relative numbcrs of these (unctional groups have bccrt cstablishcd using ATR lR spcctroscopy and chemical dcrivatization. The surface functionality consists primarily of carbonr'l dcrivativcs, with approximttcly 6ClX, oi thcsc prescnt as carboxylic acid groups and 40'b as kctoncs or aldchy'des. Alcohols d,r not sccm to bc prcscnt. Thc absolute numbcr of carboxylic acid groups gcneratcd at the surfa!'c rlas assrty'cd using two indepcn- dcnt fluorimctric tcchniqucs to bc approximately 2 X l0l5/cml of gcontctricrl filrn arca: sincc thc surface is rough, thc actu.rl surface dcnsity of carb,.lxyl groups is lower thrn this numbcr. Severll procedures hrve becn dcvcloped which use thesc carbor- ylic acid groups as thc basis for (urthcr chcnrical modification of the pol;-mc'r surface.