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Title:

Viscous flow (Rheology)

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Title: 6.3 ---- Author: wanggch Last modified by: shishan Created Date: 11/28/2006 1:57:21 AM – PowerPoint PPT presentation

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Tags: flow | hdpe | rheology | viscous

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Title: Viscous flow (Rheology)


1
?9????????
  • ????????
  • Viscous flow (Rheology)

2
(No Transcript)
3
9.1.1 ???????? ----????????
  • ?????????(????)???????,???????,????????,??????????
    ????????.
  • ??????????????????,???????????????

?????????????????????????????????????????????
4
9.1.2 ?????????
(1)???,???? ????????????????????????????????,????
???? (2)????????????????????????????(????)?
(3)???????????????????,?????????????,??????,?????
??????,???????,????????
5
9.1.3 ??????????
1.??????????????????????????
  • ????????????????
  • ???????????,??PaS
  • ?????????????????????,????????????

6
2??????
???a
  • ????????????????,???????(???)?????????????????,???
    ??????????

???????????
?????????,???????????? 1.?????
2.????? 3.?????
7
??(Binghann)???
??????????? (??????)?,?????,?????????????
????????????????????????????????(PVC??)??????????,
??????????????????????????
8
???????
N ????
B
B ????
P ?????
tc
D ?????
?
??????????????????????????? ????,?????????
??????????????????????????? ????,?????????
9
?????????????????
10
?????????
D
N ????
N
P ???
P
D ???
  • ?????t??????
  • ???????
  • ????

?????t?????? ????????? ??,??????????
11
9.1.4 ????????
?0
??
???(???)
?????
?????
12
???????????? (????)
  • 1??????
  • ?????,?????n1,???????????????
  • ?????????,?????????????????,???
  • ?????????????,????????,???????
  • 2?????(????)
  • ???????nlt1,???????????a,???????
  • ??,?a??????????????,??????,???
  • ???,????????????????,?????,???
  • ????????????????????????????????
  • 3??????
  • ??????,???????n1,?????????????
  • ???,?????,?????,????????,?????
  • ????? ,????????????????????????
  • ????8?????????,???????8??a?

13
9.2 .1 ?????????
  • ?????
  • ??????
  • ?????
  • ???
  • ????
  • ???

14
?????
?????r,?? ? ???,??? ? ,???
? ?????????? ?,?????
???????????????
15
??????
  • ??????????????????,?????????????,????????????????
    ???????,? ???,??? ? ?????
  • ??????,??????????????????,???????
  • ???????,?????????????????????????????????????????(
    ??????)???

16
?????
  • ???????????????????
  • ??????????
  • ????(Melt index ??MI )??????????????,10min????
    ????????????????????????,?MI??,???g/10min?
  • ?PE190?,2160g?????MI190/2160?
  • ?????????,??????,????????????
  • ??????????????????,????????
  • ?????MI????????????????????,?????,MI????

17
????????
  • ???????????????????????

????? ??????(??100?C)?????????,????????????????
Mooney Index
100?C
??3min
??4min
18
??????????
  • ?????
  • ???????????
  • ????????,????,????????????
  • ??????????????,???????????,???????????

19
9.2.2 ?????????
  • ???????
  • ??????,??????
  • ????????,???????
  • ??????
  • ?????,???????????????
  • ?????,?????????,?????????????,??,???????
  • ?????
  • ??????????

20
??????????????
M1
M2
M3
M4
M1 lt M2 lt M3 lt M4
?????????????Tf Td (????) ????????????,????????
?,????????????????,??,???????????,????????????
21
Examples
???????
Tf gt Td
PVC
????
????
PAN
Tf gt Td
????
????
PS
22
???????

HDPE 100130 170200 gt300
PP 170175 200220
PS 112146 170190
PVC 165190 170190 140
PMMA 210240
ABS 180200
  • ????????????????????, ? ?????????????

23
9.3 ????????????
? ?
????
????
????
? ?
???
????
?????
? ?
????
24
(1) ?????????
???M?, ?????, ?????, ????????????????????????????,
?????, ?????????????, ????????, ?????
M lt Mc
M gt Mc
logMc
25
???????????????????????20????????????,???????
??1.5?10?
  • ???????????????
  • ???????????
  • ???????????
  • ???????????????

26
(2) ????????????
????????????????????
High distribution
Small distribution
Why?
??????,??????????? ??????,????????????
27
  • ??MWD???,??????????,???????????,????
  • ??MWD????,????????????,MWD????????????
  • ??MWD???

28
(3) ????????
????, ?????????, ??????, ??????
????, ????????, ???, ??????
29
(4) ???????
?1?160200??,??PVC?????,???PVC??????,??????PVC???
??,??????200????,??PVC???????,???????,???PVC??????
???,???????
?2PP(????)?208????,???????????,???????,??????,???
????????,??????,?????208???????? ?3HDPE?100atm,1
70?????,?????????,????????????
30
(5) ???????
Arrhenius Equation ???????
When T gtTg100
?E? - ????? viscous flow energy
??(?????)
???????????
?E? ??????????, ??????????, ???????!!
31
????
???????
???
?E??
???????? ???????
???
?E??
????
ha
PS
PE
PC
PS
PE
????
PC
POM
????
32
9.4 ??????????
  • ??????????????????,???????????????????????
  • ??????????????????,??????,???????????,?????,??????
    ??,?????????????
  • ???????
  • ?????,????
  • ????
  • ?????

33
9.4.1 ?????,????,????
?????
?????
  • ?????????,?????????????,???????,???,????????????,?
    ?????????,??????

34
9.4.2 ????(?????)
  • ?????????,???????????,???????????????????,??????,?
    ????????????,???????
  • ???????????????,??????????????????

??????
???
die
35
9.4.3 ?????(????)
  • ??
  • ??
  • ???
  • ??
  • ??
  • ?????

Unstable flow
B
A
C
  • ??
  • ??????????,??????????????????????????????
  • ????????(B ?)
  • ????????(A?C ?)

36
9.4.4 ?????(????)
  • ????
  • ???
  • ???
  • ???
  • ?????
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