I. KIEN THlTC CAN NHd
3.TINH GV yeu cau HS nhdm 2 neu:
- Tinh chat vat li ciia polime. - Tinh chat hda hgc cua polime
CHAT
HS nhdm 2 thao luan dudi sy huong dan, dieu khien ciia GV cho ket qua. - Tinh chat vat li cua polime
+ Polime hau bet la chat ran (vi cd khoi lugng phan tir Ion luc lien ket phan tir Idn).
+ Khong bay hoi, khong cd nhiet dp ndng chay xac dinh. Polime chay ra cho dung dich nhdrt. De nguoi se ran
lai gpi la chat nhiet deo, mot so polime
khong ndng chay khi dun ndng ma bi
phan buy gpi la chat nhiet rdn.
+ Da so polime khong tan trong nuoc va trong cac dung moi thong thuong.
Hogt dgng cua GV Hogt dgng cua HS
+ Nhilu polime cd tinh dan hoi hoac tinh deo hoac cd thi keo dai thanh sgi. Mot s l polime cd tinh each dien, each nhiet hoac ban dan.
- Tinh chat hda hgc cua polime
+ Phdn img cdt mgch polime: Polime
bi giai triing 6 nhiet do thich hgp va polime cd nhdm chiic nhu -CO-NH-, -COOCH2-... de thiiy phan khi cd mat axit hay bazo. Vi du
-fNH-(CH2)5-CO^ + n H 2 0 - ^ nNH2-(CH2)5-C00H
+ Phdn irng khdu mgch polime la phan
ling tao ra cac cau noi giira cac mach (ciu - S - S - , hay -CH2-) tao thanh polime cd mang ludi khong gian hoac phan img keo dai mach polime.
+ Phdn img gia nguyen mgch la cac
phan ling cong vao lien ket doi hoac phan ling thay the cac nhdm chiic trong mach. Vi du t C H z - C H C l t n + nNaOH -^ -^CH2-CH0HJTi + nNaCl -^CH2-CH=CH-CH2i-n + HCl -^^ -[ CH2-CH2-CH(Cl)-CH2i-n Hogt dgng 3