SCIENCETECHNOLOGYl
RONG HOP VA NGHIEN CUU TINH CHAT CUA COMPOZIT POLYANILIN/MONTMORILLONIT
'RAPARATION AND SOME PROPERTIES OF POLYANILINE/ MONTMORILLONIT COMPOSITE
Nguyen Ngoc T h a n h , Hoang Van T r i e u , Vu Quoc Trung
T 6 m t l t
Compozit polianilin/montmorillonit dUOc tong hop bSng phuong phap trting h ( ^ monome anilin va montmorlllonit (clay) ddng chit oxi hda (NH^ljSjOj. Tinh chat cua vat lieu t6ng hop da duac nghien cdu bSng c^c phifffng phdp: pho IR, phSn tich nhi^t khoi lUdng (TGA), anh SEM, pho X-ray. Tinh chat hap thu song di^n ttlcita mang pM compozit polianllin/clay cho t h l y kh^ nang Onq dung cao.
Tif khoa: Compozit poltanilin, pho IR, phan tich nhiet khoi lifong.
Abstract
Polyanliine/day composite were prepared by polymerization of aniline in the presence of clay (montmorillonit) using (NH^j^SjO, as oxidant. Properties of the obtained polyanilme/clay composite were studied by IR speara, thermal gravimetric analysis (TGA), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electromagnetic shielding property of the layers formed from rtiis material shows high applicability.
Keywords: Polyaniline composite, IR spectra, thermal gravimetric analysis.
T5. Nguyen Hgoc Thanh, Ho^ng VanTriSu Khoa Cong nghe Hda hoc, trudng Oai hoc Cdng nghiep Ha Ndi PGS.TS.VQQudcTmng
> Khoa Hda hoc, midng flai hoc Sir pham Ha Noi ' Email: [email protected]
Ngaynhanbai: 15/11/2014 Ngay diap nhan dang: 15/12/2014
I . O A T V A N D i
Ngay nay phuong phap to hop cac vat
^u khoang t a nhien vdi polime dan dugc hat trien va quan tam rpng rai nham tao 1 compozit CO tinh nang tuyet vdi co the ap iJng nhu cau sCf dung trong cac nganh ing nghiep cong nghe cao. Polyme In CO nhieu ufng dung quan trong nhu long an mon va b^o ve icim loai [1,2], vat
>u tang hinh [3,4], trong sieu ty dien [5, , thiet bi dien s5c [7], vat lieu cam bien i h hoc va hoa hoc [8,9,10] Polianilin Ani) da duoc tong hop lis lau, song tdng :Sp vat lieu compozit polianilin va nghien
cufu u'ng dung cua no trong hap thu song dien tCr con itdUOc nghien CLAJ.
Bai bao nay trinh bay ket qua ban dau ve tdng hop va nghien cuu tinh chat cua compozit polianilin/clay v6i myc dt'ch tim kiem kha nang linq dung loai vat lieu nay Bang 1, Cac mau compozit PAni/day da tdng hop
de hap thy song dien tCf d dai tan song Rada quan su.
Z - T H U C N G H I I M
2.1. Quy trinh tong htfp compozit PAni/clay
+ Lay mot \ugng chinh xac cua clay (montmorillonit) hoa tan vao 100ml nudc cat. Them vao Ian luot 40ml isopropanol va the tich chinh xac anilin. Khuay manh 6000 vong/phut trong 1 gid.
+ Nho tCrtUdung dich chCfa mot luong tuong Lfng (NH4)jSj03 (ti le moi glCfa monome va tac nhan oxi hda la 1:1,5).
Khuay manh trong 2 gid. Hon hop phan ijfng cd mau xanh den.
+ Loc lay phan chat ran, say ap suat thap d 40°C trong 48 gid. Ket qua da tong hop duoc nhu bang 1.
2 . 2 . N g h i e n cufu cac t i n h c h a t c u a c o m p o z i t PAni/FCjO^
P h o h d n g n g o a i c u a cac c h a t d o d d a n g e p v i e n v d i KBr t r e n m a y GX-Perkin Elmer-USA t a i Khoa H o a h o c - T r u d n g D H K H T N - D H Q G Ha N o i . Be m a t c u a m a u d u o c q u a n sat t r e n k i n h h i e n v i d i e n t i f q u e t m a y SE(Vl-HITACHl-4800, K h o a V a t
Mau m (gl cljy
•snilin I"!)
%a{iilifi/clay(%)
"1 iNH.l A O , (9)
T, 0 2 0 7,517
T, 20 1 5 3,758
T, 20 2 10 7,517
T, 20 J 15 11,274
S625.2014.TapdiiKHOAHOC&CONGNGHE 5 5
EffiaffiacONGNGHX
ly - T o r d n g D H K H T N - O H Q G Ha N d i . O d b e n n h i e t cua m a u n g h i e n cUu dUOc d o t r e n m a y Shimazu TGA - 50H - Bo m d n Hda Li - Khoa Hda hoc -TrUdng Gai hoc SU p h a m Ha Ndi, d e n 600°C v d i t o e d d 10°C/
p h u t . Pho XRD cua m a u n g h i e n cUu dUoc g h i t r e n m a y VNU-SIEMENS-5005 Bruker G e r m a n y tai TrUong OHKHTN - DHQG Ha N d i . K h ^ n a n g h a p t h u s d n g dien t U cua m a u n g h i e n cUu d o d d a n g m a n g p h u d p d a y 2 m m t r e n t a m t h e p d v u n g t a n so 8,14-11,8 GHz tai Vien D i e n tCt va Vien t h o n g - T r u n g t a m Khoa hoc va C o n g
?ffMmtm,f^
Hinh la. Miu clay
n g h e Q u a n sU.
3 . K ^ Q U A V A T H A O L U A N 3 . 1 . A n h SEIVI cua m a u n g h i e n cuHi H i n h thai b e m a t cua cac san p h a m c o m p o z i t d u o c xac d i n h b a n g a n h h i e n vi d i e n tLf q u e t (SEM).
Qua a n h SEM ta t h a y : H i n h l a la a n h SEM cua clay da t m h c h e v d i d d p h a n giai l O m i c r o m e t c h o t h a y c a c h a t d a y b j k e t t u t h a n h khdi va p h a n t a n k h d n g d d n g d e u . H i n h I b P A n i rieng r e d d a n g h i n h d n g CO kich t h u d c k h o a n g 4 0 - 7 0 n m .
T r o n g m a u PAni/clay (T,) h i n h I c ta t h a y c o m p o z i t t a o t h a n h c d d a n g t a m , la, b e m a t x o p . Cau t r u e vat lieu cua m a u PAni/clay t h u dUOc d a y k h i t va c d ft k h o a n g t r o n g h o n m a u PAni va m a u clay.
3.2. Pho n h i e u x a t i a X (XRD) cCia m a u n g h i e n culU
Ket q u a n h i e u xa tia X c h o t h a y d U d n g XRD cua clay c o m d t pic d 2 6 = 4,70 t u o n g l i n g v d i k h o a n g each cac l a p la l , 8 8 n m . O u d n g XRD cua cac m a u PAni/clay T^ c o pic 2 6 = 7,020 t u o n g U n g v d i k h o a n g each cac I d p la 1,26nm. T r o n g g i a n d o n h i e u xa tia X cua PAni/clay T j va PAni/clay T^ c h i ra k h o a n g each cac Idp t U o n g U n g la 1,32nm v a l , 4 3 n m .
clay.
33. P h o h d n g n g o a i cua mau n g h i e n cCfu ( h i n h 3 , b A n g 2 )
Hinh 2. Gian do nhieu xa tia X cua day, PAni/day (TI), PAni/clay(T2}, PAni/clay (TB)
Nhgnxet: D o clay ed t i n h h a o nude, d e h u t a m t r o n g k h d n g k h i n e n d d a n g ket t u t h a n h k h d i . D o dd clay c d k h o a n g each gifla cac I d p Idn. 6 cac g i a n d d XRD cua PAni/clay, d o c d s u h i n h t h a n h PAni giCa cac Idp CLia clay trat t U h o n n e n k h o a n g each giUa cae Idp d a y g i a m x u d n g n h d h o n l , 8 8 n m . Tuy n h i e n i u g n g a n i l i n d u o c c h e n v a o giOa cac ! d p cua clay n h i e u len n e n k h o a n g each nay t a n g t U 1,26nm l e n 1,32nm va 1,43nm. C h U n g t d da t o n g h o p t h a n h c d n g n a n o c o m p o z i t p o l y a n i l i n /
H"inh3 Pho IR cua mau PAni/day (T2) P h o IR c u a cac c o m p o z i t PAni/day d e u c d cac d i n h p h d t U o n g u t i g vdi dao d d n g h o a trj cua cac n h d m C=C va C=fl t r o n g p o l y a n i l i n . N g o a i r a , t r e n pholRcua cae m a u nay d e u t h a y x u a t hien cac dinh p h d v d i c u d n g d o m a n h d 1032 (T,), 1034 (Tj) v a 1029 (T,) c m " ' dac trUng cho ciao d d n g h d a t r i c u a cac n h d m S i - 0 trong clay, 527(T,); 5 2 0 ( T ^ ; 5 2 6 (T^) cm"! dac trutig c h o d a o d d n g h d a tri cua cac n h d m AK) t r o n g clay.
3 . 4 . P h o p h a n t i c h n h i e t khoi lUAig (TGA) c u a cac m a u n g h i e n cuHi
D e t h a y r d d u o c q u a t r i n h phan huy b d i n h i e t cda PAni va v a t lieu compozit PAni/clay t r o n g p h e p d o p h a n tich nhiet t i e n h a n h d o 2 c h i t i e u la DTG va DTA, Phd TGA c u a m a u T^ dUOc c h i ra d h i n h 4.
Tren g i a n d d p h a n t i c h nhiet cua mau n g h i e n c d u , k h i t a n g n h i e t d o tii nhiet do p h d n g d e n k h o a n g I B O X , khoi lifOng m a u g i a m 1 1 , 7 6 0 % ( T ^ , 8,286% (T,), 6 , 9 1 2 % (Tj) d o s u b a y h o i cua nifdc am v a m d t p h a n m o n o m e , d i m e hay trime b i p h a n h u y . . . T i e p t u c t a n g nhiet do 6h 6 0 0 X , k h d i l u o n g m a u g i S m 99,179%{TJ, 9,751 % (T,), 1 2 , 2 7 5 % (T^) d o sU ph^n h&y m a n h eua p o l y m e c d n d u c d n lai trong san p h a m . N g o a i ra c d n c d sU phan hiiy c u a d i m e , t r i m e , o l l g o m e t a o t h a n h braig q u a t r i n h p h ^ n U n g . S a u 6 0 0 ° C , khoi liWng m a u g a n n h u k h d n g d o i chufng t d l i W g p o l y m e t r o n g m a u d a p h a n h u y gSn hS, n h u v a y l u o n g clay c d n lai t r o n g mauB 8 1 , 9 6 3 % ( T , ) ; 8 0 , 8 1 3 % ( T j } v a 74,052% {Tjl-
3 . 5 . P h o h a p t h u s o n g d i e n tir dia m a u n g h i e n cufu ( h i n h 5 a , b )
Kha n a n g c h e c h ^ n d u o c d a n h gia qw
»6 TapdiiKHOAHOC&CONGNGHE. S o 2 5 . 2 0 1 4
SCIENCETECHNOLOGYl
B Jng 2. Dtf tieu ve pho IR cua PAni/clay So song (on') 3697(T,);3697(T2};3694(T3) 3448(Ti);3428(T!);3420(T3) 1637(T,);1624(T2);1578(T,) 1400; 1498 (T,),(T2),(T3)
m4(T,),ai) 1032(T,},i034!T2);1029[Ti)
913{T,);914(T,),901(Tj) 527(T,);S20a2},526(T,) 436(T,);468(T2);464(T3)
Hinh dang Nhon
Tu Nhon Nhon Nhon Nhon Nhon Nhon Nhon
Cirdngdo Tning binh Tmng binh Yeu Ye'u Tmng binh
Manh Trung binh Trung binh Manh
Dao dong UOH<ui<tay UN-MUU; UN-H<&J
Uc^Buml Uc=H 6H(
5cH,-S02-0- UShOoiaday Oc-HIkUnqm) 6 * H l d i . d ^
6sM)(iuddr
Hinh 4. GiSn do phan tich nhiet cua mau PAni/
clay(T)
Hinh 5a. Pho hap thu song dien tif cua clay
I
Hinh 5b. Pho hap thu song dien tif cua PAni/day
cdng thu'c SE = 1 0 l o g -
Trong dd: SE la dd hap thu (dB); p, la edng suat cua sdng dl qua (W); p^ la cdng suat cua sdng tdi (W).
Hinh 5a the hien kha nang hap thu sdng dien tU cua mau clay. Gia tri SE cue dai tai tan sd 11 GHz, SE= -039 dB. SU che chan cue dai chi dat khoang 18,53%.
Hinh 5b the hien kha nang hap thu sdng dien tdcua mau PAni/clay (T^). Gia trj SE cue dai tai tan sd 8 GHz, SE ^ -3,23 dB.
SU che chan cue dai dat duoc la 52,5%.
TucJng t u vay, mau T, sU che chan dat duoc 33,32% (1 IGHz, SE = -1,76 dB); mau T^ SU che Chan dat dUOc 35,60% (11 GHz, SE^-l,91dB).
Qua ket qua phan tich tren thay rang vat iieu compozit PAni/clay cd kha nang hap thu sdng dien t d d vung 8,14-11,80 GHz (uTig vci^ dai sdng rada quan su^.Tuy nhien, su hap thu sdng dien tir nay la khdng dong deu va hap thu manh nhat d tan sd 8,0 GHz vdi SE= - 3,23 dB, tdc sUche chan dat 52,5%.
4 . I ^ L U A N
Trong nghien cuXi nay, ctiung tdi da tdng hop duoc 03 mau compozit PAni/clay true tiep trong dung mdi.TTnh chat cua vat lieu da duoc nghien cdu bang cac phucmg phap phd Ifi, phan tich nhiet TGA, SEM, pho XRD va phd hap thu sdng dien td.
Cac ket qua nghien cdu da chi ra rang PAni cd trong mau nghien cdu, cd dp ben nhiet cao va cd dd ddng deu. Mang phu che tao t d compozit PAni/clay tren nen thep cd kha nang hap thu sdng dien t d
d d^i rada quan sU. Tuy nhien sU hap thu sdng dien td nay van chua thuc su cao va chi dat 52,5% d 8,0 GHz. Trong bai bao tdi, chung tdi se tiep tuc thdng bao kha nang hap thu sdng dien tCf cao cua PAni/clay duoc tdng hop bang sU cai tien quy trinh dtren.
Phin bien khoa hoc TS. Vu Minh Tan
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