Electron microscopic investigations on amorphous polycarbonate
Electron microscopic investigations on amorphous polycarbonate
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无定形聚碳酸酯的电子显微镜研究
DOI：
10.1002/pol.1967.110050818
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发表时间：
1967
期刊：
影响因子：
--
通讯作者：
H. A. Stuart
中科院分区：
文献类型：
--
作者：
W. Frank;H. Goddar;H. A. Stuart
在用各种物理技术进行的系统实验过程中，（1）我们用电子显微镜方法研究了无定形聚碳酸酯。进行这些研究的目的是更好地理解该聚合物在低于玻璃化转变温度T1的高温下退火时的机械行为。在由勒沃库森的Farbenfabriken Bayer AG生产的厚度为200 μ m的双酚A聚碳酸酯的未取向膜上进行测量。起始条件通过将样品加热超过T（160 ℃）来限定。然后在冰水中淬火。电子显微镜曝光取自由铂遮蔽后的样品产生的碳复制品。对未处理的无定形聚碳酸酯表面的电子显微镜研究在样品的形态中没有产生详细的结构。通过在别处描述的离子蚀刻技术去除表面层（2）产生由小于100埃的范围内的颗粒组成的一定粒度（图1a）。这与Geil（3）同时在聚对苯二甲酸乙二醇酯的情况下观察到的球状结构相似。在110 ℃下退火样品72小时后，远低于T，（150”C.），然而，一个复制品从一个离子-
In the course of systematic experiments carried out by various physical techniques (1) we studied amorphous polycarbonate by means of electron microscopic methods. These investigations were conducted with the purpose of understanding better the mechanical behavior of this polymer when annealed at elevated temperatures below the glass transition temperature T,. The measurements were carried out on unoriented films of polycarbonate from bisphenol A, with a thickness of 200 p, produced by Farbenfabriken Bayer AG, Leverkusen. The starting conditions were defined by heating up the samples beyond T,(160 C.) and subsequently quenching them in ice water. Electron microscopic exposures were taken from carbon replicas produced from the sample after being shadowed by platinum. Electron microscopic studies on the surface of untreated amorphous polycarbonate yield no detailed structures in the morphology of the sam-ple. Removing the surface layers by means of an ion-etching technique described elsewhere (2) produces a certain granularity (Fig. la) consisting of grains in the range of less than 100 A. which are similar to the ball-like structures observed by Geil (3) in the case of poly (ethy1-ene terephthalate) in the meantime. After annealing the sample 72 hr. at llOC., far below T,(150" C.), however, a replica taken from an ion-