b****i
发帖数: 8 | 1 Is here sb. familar with this polymer (PHB), poly-3-hydroxybutyrate? |
w********h
发帖数: 12367 | 2 Yoshiharu Doi has a book for such polymers.
PHB and PHA.
poly3-HB and poly4-HB
they are biopolymers.
unfortunately they will thermodegrade at T above 150C,
very quickly.
【在 b****i 的大作中提到】
: Is here sb. familar with this polymer (PHB), poly-3-hydroxybutyrate?
|
b***e
发帖数: 115 | 3 I am just some familiar with this polymer. it has been investigated for more
than 15 years extensively. What:s up??
【在 b****i 的大作中提到】
: Is here sb. familar with this polymer (PHB), poly-3-hydroxybutyrate?
|
b***e
发帖数: 115 | 4 I think the temperature is above 190.
【在 w********h 的大作中提到】
: Yoshiharu Doi has a book for such polymers.
: PHB and PHA.
: poly3-HB and poly4-HB
: they are biopolymers.
: unfortunately they will thermodegrade at T above 150C,
: very quickly.
|
w********h
发帖数: 12367 | 5 I once did some measurements on P3P4...
it can be observed that the polymer degrades quickly when temp is above 150C.
Rheological curves showed the degradation is rather severe.
Don't remember what happened to pure P3.
Doi's book discussed everything on that.
【在 b***e 的大作中提到】
: I think the temperature is above 190.
|
b***e
发帖数: 115 | 6 你们也在搞这个东西，不会吧
你是哪个学校的？？
我觉得已经很少有人还会关心这个东西，除了我们实验室。
150C.
【在 w********h 的大作中提到】
: I once did some measurements on P3P4...
: it can be observed that the polymer degrades quickly when temp is above 150C.
: Rheological curves showed the degradation is rather severe.
: Don't remember what happened to pure P3.
: Doi's book discussed everything on that.
|
w********h
发帖数: 12367 | 7 no...I just did some measurements for a summer intern.
I did investigate the properties of such polymers.
nothing interesting to me, considering the various crystallinities and low
degradtion T.
【在 b***e 的大作中提到】
: 你们也在搞这个东西，不会吧
: 你是哪个学校的？？
: 我觉得已经很少有人还会关心这个东西，除了我们实验室。
:
: 150C.
|
b****i
发帖数: 8 | 8 My project is to study PHB's crystallization. I'm in Britain. What kind of
research are you doing on this polymer?
【在 b***e 的大作中提到】
: 你们也在搞这个东西，不会吧
: 你是哪个学校的？？
: 我觉得已经很少有人还会关心这个东西，除了我们实验室。
:
: 150C.
|
c*******n
发帖数: 1648 | 9 A MIT related company sent out a lot of this kinds of materials to various
university to help them commercialize them. I used to process this material
once. They are pretty nasty as I remember when this molten polymer come out
from the extruder, they can not crystallize immediately. They were just like
rubber, and the pelletizer can not cut them through. For compression molding,
they are even more sticky than nylon. I think that's the reason why you guys
have to think about the crystallization o
【在 b***e 的大作中提到】
: 你们也在搞这个东西，不会吧
: 你是哪个学校的？？
: 我觉得已经很少有人还会关心这个东西，除了我们实验室。
:
: 150C.
|
b***e
发帖数: 115 | 10 yes, you are right. Now, it has been known for many years. Add Boron Nitride
can increase its crystallization temperature. Thus, can give a increased
crystallization rate. |
