b**m
发帖数: 18 | 1 Hi, I tried several times to observe the spherulites, but failed. Now my boss
asked me to use neat nylon to familiaze the technique. But I still cannot
observe anything!
What I did were;
(1) I used a compression molding machine to raise the temperature to about
240C, without applying pressure. The nylon pellets were placed on a glass
plate on top of a steel stage.
(2) Then I pressed another glass plate on the nylon melt and press it hard.
(3) Then I took the steel stage off, and let the system c | b***e
发帖数: 115 | 2 我不知道nylon有没有球晶
但是，按照你的结晶过程，一般来说，球是可以看到的
你有没有调整焦距啊。焦距很重要你确信你的焦距一定正确吗？
光的强度不要太高。当然也不能什么都看不见
关于球晶尺寸，主要决定于他高分子本身，很难说
大的有mm级，小的有um
级，还有你用的样品量太多，只要一点点就够了
有很多高分子本身就没有球晶，要注意这一点
【在 b**m 的大作中提到】
: Hi, I tried several times to observe the spherulites, but failed. Now my boss
: asked me to use neat nylon to familiaze the technique. But I still cannot
: observe anything!
: What I did were;
: (1) I used a compression molding machine to raise the temperature to about
: 240C, without applying pressure. The nylon pellets were placed on a glass
: plate on top of a steel stage.
: (2) Then I pressed another glass plate on the nylon melt and press it hard.
: (3) Then I took the steel stage off, and let the system c
| b**m
发帖数: 18 | 3
I've read papers showing spherulites in nylon...
Thanks. I'll keep trying..
boss
hard.
Can
【在 b***e 的大作中提到】
: 我不知道nylon有没有球晶
: 但是，按照你的结晶过程，一般来说，球是可以看到的
: 你有没有调整焦距啊。焦距很重要你确信你的焦距一定正确吗？
: 光的强度不要太高。当然也不能什么都看不见
: 关于球晶尺寸，主要决定于他高分子本身，很难说
: 大的有mm级，小的有um
: 级，还有你用的样品量太多，只要一点点就够了
: 有很多高分子本身就没有球晶，要注意这一点
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