s*****g
发帖数: 221 | 1 to calculate the crystallinity(weight fraction)
of polymer in an polymeric composites(a ratio filler)
from heat of fusion(HF) is
wc = HFexp/((1-a).HFstd)
HFexp is the experimental heat of fusion. unit: J/g composites.
HFstd is the heat of fusion of 100% crystal of polymer, unit: J/g polymer
I used the equation in my Ph.D thesis, but I donot know
where it comes from. I looked up some books cannot find it.
someone interested in this please help me to find one refer...
///boww~~~~~
the consquence e |
s*****g
发帖数: 221 | 2 If someone think the first eq. is for the
crystalline ratio based on the whole composites
(not the polymer matrix).
Please let me why.
I was thinking it is. but it is not. |
w********h
发帖数: 12367 | 3 don't understand u. I have no difficulty with that equation.
when a=1, no meaning of that dH/[(1-a)dHo].
when a=0, Wc is the crystallinity of the polymer.
most polymers are just semi-crystalline,
i.e.; the crystallinity is not 1.
dH for 100% crystalline polymers are extrapolated from changing heating rate
in DSC.
【在 s*****g 的大作中提到】
: to calculate the crystallinity(weight fraction)
: of polymer in an polymeric composites(a ratio filler)
: from heat of fusion(HF) is
: wc = HFexp/((1-a).HFstd)
: HFexp is the experimental heat of fusion. unit: J/g composites.
: HFstd is the heat of fusion of 100% crystal of polymer, unit: J/g polymer
: I used the equation in my Ph.D thesis, but I donot know
: where it comes from. I looked up some books cannot find it.
: someone interested in this please help me to find one refer...
: ///boww~~~~~
|
c*******n
发帖数: 1648 | 4 I don't think it's wrong, why? Probably you should write the eq. in this way
Wc = (HFexp/(1-a)) /HFstd
【在 s*****g 的大作中提到】
: to calculate the crystallinity(weight fraction)
: of polymer in an polymeric composites(a ratio filler)
: from heat of fusion(HF) is
: wc = HFexp/((1-a).HFstd)
: HFexp is the experimental heat of fusion. unit: J/g composites.
: HFstd is the heat of fusion of 100% crystal of polymer, unit: J/g polymer
: I used the equation in my Ph.D thesis, but I donot know
: where it comes from. I looked up some books cannot find it.
: someone interested in this please help me to find one refer...
: ///boww~~~~~
|
c*******n
发帖数: 1648 | 5 Now probably I understand what you asked for. The eq. 1 is indeed for matrix
if you input the weight of the composite into DSC. Think: what if you input
the weigth of matrix only into DSC. Then u got eq. 1.
【在 s*****g 的大作中提到】
: If someone think the first eq. is for the
: crystalline ratio based on the whole composites
: (not the polymer matrix).
: Please let me why.
: I was thinking it is. but it is not.
|
s*****g
发帖数: 221 | 6 if you think the second eq. is right...///hug~~
Where can I get a reference for it? or a easier understanding deduction?
I donot want to use my stupid big calculation to confuse
others.
【在 w********h 的大作中提到】
: don't understand u. I have no difficulty with that equation.
: when a=1, no meaning of that dH/[(1-a)dHo].
: when a=0, Wc is the crystallinity of the polymer.
: most polymers are just semi-crystalline,
: i.e.; the crystallinity is not 1.
: dH for 100% crystalline polymers are extrapolated from changing heating rate
: in DSC.
|
s*****g
发帖数: 221 | 7 sorry, confusing.....
Both of the eq. are for composites.
the first Wc fraction using the composites mass as denominator.
the second Wc fraction using the polymer matrix mass as denominator.
My question is, is it right?
How to prove them right easily.
【在 c*******n 的大作中提到】
: Now probably I understand what you asked for. The eq. 1 is indeed for matrix
: if you input the weight of the composite into DSC. Think: what if you input
: the weigth of matrix only into DSC. Then u got eq. 1.
|
w********h
发帖数: 12367 | 8 now I have to say I cannot understand.
you think the first one is not right? or the second one is close to your
prediction? or what else?
rate
polymer
【在 s*****g 的大作中提到】
: if you think the second eq. is right...///hug~~
: Where can I get a reference for it? or a easier understanding deduction?
: I donot want to use my stupid big calculation to confuse
: others.
|
s*****g
发帖数: 221 | 9 sorry, my question originally is,
I believe The second equation obtained the
Wc fraction based on composite's mass.
because it looks like not convincing (maybe I am wrong).
so I intended to simplify it but gave you the first equation.
my difficulty here is I need a equation to calculate
the Wc fraction based on composite's mass.
but I need to convince the reviewer the eq. is right.
I donot think it is a good idea to deduce it using high school
knowledge(step by step).
so I am asking for a refer
【在 w********h 的大作中提到】
: now I have to say I cannot understand.
: you think the first one is not right? or the second one is close to your
: prediction? or what else?
:
: rate
: polymer
|
w********h
发帖数: 12367 | 10 then the first euqation is right ah....
you don't even need to cite any references to convince anybody,
it is everywhere and very reasonable.
you first got dH for the whole thing from DSC,
dH should be only polymer's, not the composite's condisering filler is not
crystalline.
then dH should be divided by dH0 (100% crystallinity polymer) times polymer
weight fraction, in your case, 1-a.
【在 s*****g 的大作中提到】
: sorry, my question originally is,
: I believe The second equation obtained the
: Wc fraction based on composite's mass.
: because it looks like not convincing (maybe I am wrong).
: so I intended to simplify it but gave you the first equation.
: my difficulty here is I need a equation to calculate
: the Wc fraction based on composite's mass.
: but I need to convince the reviewer the eq. is right.
: I donot think it is a good idea to deduce it using high school
: knowledge(step by step).
|
s*****g
发帖数: 221 | 11 Thanks but sorry, cannot understand you completely.
it is a little bit more difficult than dH/(1-a)/dH0, the other Brother
suggested.
I know the first equation is right.
What is your opinion the second one?
my question is on the second one, the first one is used to prove the second. |
s*****g
发帖数: 221 | 12 Thanks, this one is easy to understand.
【在 c*******n 的大作中提到】
: I don't think it's wrong, why? Probably you should write the eq. in this way
: Wc = (HFexp/(1-a)) /HFstd
|
s*****g
发帖数: 221 | 13 sorry, I am puzzled now..
Yes the Eq.1 is indeed for matrix.
when I put the weight of composite(not matrix) into DSC,
then I got Eq.1.
if I put the weight of matrix into DSC. I cannot understand Eq.1.
【在 c*******n 的大作中提到】
: Now probably I understand what you asked for. The eq. 1 is indeed for matrix
: if you input the weight of the composite into DSC. Think: what if you input
: the weigth of matrix only into DSC. Then u got eq. 1.
|
