Monomer-Cast Chloral Polymers
Monomer-Cast Chloral Polymers
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DOI：
10.1021/ma60029a027
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发表时间：
1972-09
期刊：
影响因子：
5.5
通讯作者：
O. Vogl;H. Miller;W. H. Sharkey
中科院分区：
文献类型：
--
作者：
O. Vogl;H. Miller;W. H. Sharkey
Liebig于1832年首次报道了氯醛的聚合反应，并证明了当用阴离子或某些酸引发时会发生聚合反应。2聚氯醛通常是一种难处理的粉末。虽然已经获得了塞子和薄膜20，并且与大量二氯乙醛的共聚物已经被浇铸成片材28，但是制备多氯醛和三氯乙醛物体的通用方法还没有。我们在此的目的是描述一种方法，我们发现该方法可有效地获得预定形状的连贯的氯醛聚合物。我们的程序是一个单体铸造过程3涉及一种技术，我们称之为cryotachensic聚合。[4]在这个过程中，起始（I）和增殖（II）分两个独立而不同的步骤进行。在第一步中，将引发剂加入到已经加热到聚合将发生的最高温度以上的单体中。纯三氯乙醛的温度约为58 ℃，加入稀释剂可降低温度。它与上限温度7 ℃有关，对于1 M单体溶液等于7 ℃。
The polymerization of chloral, first reported by Liebig1 in1832, has been demonstrated to occur when initiated with an-ions or with certain acids. 2 Polychloral is ordinarily ob-tained as an intractable powder. Though plugs and thin films have been obtained20 and copolymers with substantial amounts of dichloroacetaldehyde have been cast into sheets, 28 a general method for preparing objects of polychloral and chloral has not been available. It is our purpose here to describe a procedure that we have found effective for obtaining coherent chloral polymers in predetermined shapes. Our procedure is a monomer-casting process3 involving a technique we call cryotachensic polymerization. 4 In this process, initiation (I) and propagation (II) occur in two separate and distinct steps. In the first step, initiator is added to monomer that has been heated above the maximum temperature at which polymerization will occur. This temperature is about 58 for pure chloral and is reduced by addition of diluents. It is related to the ceiling temperature 7C and is equal to 7C for a 1 M solution of monomer.