1) cng: H thng Nha nhit do H thng Nha nhit rn Kim sot qu trnh bin i tnh cht trong qu trnh to mng Cc giai on ca qu trnh hnh thnh mng H nc Sn tnh in
Hu nh tt c cc c tnh mong mun ca mt lp
ph tt ph thuc vo cht lng v tnh ton vn ca lp ph m iu ph thuc vo thnh phn, tnh cht ha hc ca cc polymer, s bin i ca cng thc, Tg ca cht to mng v c im b mt ca cht nn
2) Mt s tnh cht ca lp ph chu nh hng ca qu trnh to mng - bm dnh - Kh nng khng ha cht - Tnh cht c hc - Kh nng bm bi - Dng chy - bng - S ph v (b dp) - chy nhu - Qu trnh kh v cng b mt
3) 3 h thng to mng chnh h thng nhit do h thng c s chuyn i c tnh ha hc h thng latex
4) Cc tiu ch ha hc v vt l kim sot qu trnh bin i ca mng - Trng lng phn t - Mt lin kt ngang (s khu mng) - Nhit thy tinh ha - Cu trc khi - nht - Nhit ng rn - S thay i cng thc
5) Mt s mc nh gi qu trnh kh ca mng: B mt mng kh khi nht > 103 Pa.s Mc kh ng gi cho 2s 20 Psi, cn nht > 107 Pa.s c xem 1 mng sn cng nghip (kh hon ton), nht phi thng xuyn l> 1012 Pa.s, l nht ti Tg.
6)Mi quan h gia nht v nhit 40,2 (T-Tg) ln? = 27,6 - ------------------51,6 + (T-Tg) T, trong Kelvin Phng trnh Williams, Landel v Ferry (WLF)
I)Cc loi mng nhit do
Cc chui polymer di c lp, ko lin kt. cc chui nm cun xung quanh nhau, c th c hoc khng c nhnh. Khng c lin kt ha tr chnh gia cc chui.
S hnh thnh mng bng cch bay hi ca dung mi t dung dch ca Polymers - Sn pha ch tnh cht mng tt, cc phn t polymer phi ln (trng lng phn t rt cao) Tuy nhin Cc polymer co trng lng phn t cao thng c nht rt ln. gii quyt vn ny, ta pha long chng vo cc dung mi d bay hi (VOC).
*Qu trnh hnh thnh mng Kh t nhin (sn pha ch)
Cc mi lin kt cho gia cc chui vi nhau th rt
yu v d dng b ph v hnh thnh lp mng
*)Nguyn tc hnh thnh mng Cc giai on hnh thnh mng (Tg cao) giai on u ca qu trnh sy kh, t l dung mi bc hi c bn l c lp ca s hin din polymer T l dung mi bc hi ph thuc vo - p sut hi - T l din tch b mt ph ca mng - T l ca dng khng kh
Khi nht v Tg gia tng, khong trng gia cc phn t gim, lc ny t l bay hi dung mi ph thuc vo thi gian cc phn t dung mi c th tip cn vi b mt ca mng.
T l mt dung mi c iu khin bi t l khuch tn ca cc dung mi trong lp mng.
*S hnh thnh mng - Polyme nhit do T l khuch tn v bay hi dung mi cng ph thuc vo cu trc dung mi v tng tc dung mi - polymer .
I)Cc loi mng nhit do Cc c tnh c hc ca mng ph thuc mnh m vo Tg ca cc polymer c s khu mng v mt kt mng Cc tnh cht vt l nh thm thu nc v oxy, kh nng khng dung mi v ha cht b nh hng bi mt lin kt khu mng ny
