p*******y
发帖数: 4 | 1 Describe the synthesis of a thermoplastic elastomer suitable
for use as a roller in a copy machine which needs to be rubbery
at 150C and glassy at room temperature.
迷惑不解阿， 热塑性弹性体如何在室温下是glassy
拜托各位！ |
w********h
发帖数: 12367 | 2 Tg高于室温不就是么。。。high Mw PS...
【在 p*******y 的大作中提到】
: Describe the synthesis of a thermoplastic elastomer suitable
: for use as a roller in a copy machine which needs to be rubbery
: at 150C and glassy at room temperature.
: 迷惑不解阿， 热塑性弹性体如何在室温下是glassy
: 拜托各位！
|
p*******y
发帖数: 4 | 3 要是SBS的话，肯定丁二喜的含量要多阿
丁二希的Tg -30， 室温肯定是橡胶态，不然如何使弹性体。
PS 的Tg 大概100
【在 w********h 的大作中提到】
: Tg高于室温不就是么。。。high Mw PS...
|
p*******y
发帖数: 4 | 4 HOW ABOUT PS-PMMA-PS ?
BUT I DONOT KNOW IF IT IS CALLED tpe?
【在 w********h 的大作中提到】
: Tg高于室温不就是么。。。high Mw PS...
|
q***i
发帖数: 170 | 5 you said another way around.
【在 p*******y 的大作中提到】
: 要是SBS的话，肯定丁二喜的含量要多阿
: 丁二希的Tg -30， 室温肯定是橡胶态，不然如何使弹性体。
: PS 的Tg 大概100
|
t*******n
发帖数: 66 | 6 The deinition of thermoelastor is that it has the property of plastic at room
temperature and rubbery properties at high temperature.
【在 p*******y 的大作中提到】
: Describe the synthesis of a thermoplastic elastomer suitable
: for use as a roller in a copy machine which needs to be rubbery
: at 150C and glassy at room temperature.
: 迷惑不解阿， 热塑性弹性体如何在室温下是glassy
: 拜托各位！
|
d*****w
发帖数: 124 | 7 I don't think so.
without chemical crosslinks is the key point. Otherwise, what is NOT
thermoelastor from your defination?
room
【在 t*******n 的大作中提到】
: The deinition of thermoelastor is that it has the property of plastic at room
: temperature and rubbery properties at high temperature.
|
c*********e
发帖数: 119 | 8 I assume that you are talking about TPE of block polymer.
There are two phases in TPE---rubber and plastics. The phase of plastics act
as the crosslinking points.
The only possibility for your case is: Tg of the rubber phase in TPE is 150C.
Tg of the plastics phase in TPE is much higher than 150C. When T>150C, this
material is a TPE (rubbery); When T<150C, this material is in glass state.
【在 p*******y 的大作中提到】
: Describe the synthesis of a thermoplastic elastomer suitable
: for use as a roller in a copy machine which needs to be rubbery
: at 150C and glassy at room temperature.
: 迷惑不解阿， 热塑性弹性体如何在室温下是glassy
: 拜托各位！
|
p*******y
发帖数: 4 | 9 我觉得你说的有道理
但我不知道具体能有哪些可以呢。
如果Tg大于150， 只能是用某种塑料了。
比如PS-PMMA-PS
150C.
【在 c*********e 的大作中提到】
: I assume that you are talking about TPE of block polymer.
: There are two phases in TPE---rubber and plastics. The phase of plastics act
: as the crosslinking points.
: The only possibility for your case is: Tg of the rubber phase in TPE is 150C.
: Tg of the plastics phase in TPE is much higher than 150C. When T>150C, this
: material is a TPE (rubbery); When T<150C, this material is in glass state.
|
r******0
发帖数: 2753 | 10
150C.
The key point is right. But the Tg of the rubber phase should be lower than
150C and higher than r.t. Tg=150C may not work very well practically.
【在 c*********e 的大作中提到】
: I assume that you are talking about TPE of block polymer.
: There are two phases in TPE---rubber and plastics. The phase of plastics act
: as the crosslinking points.
: The only possibility for your case is: Tg of the rubber phase in TPE is 150C.
: Tg of the plastics phase in TPE is much higher than 150C. When T>150C, this
: material is a TPE (rubbery); When T<150C, this material is in glass state.
|
