STRUCTURE AND MAGNETIC PROPERTIES OF NANOCOMPOSITES ON THE BASIS PE+Fe 3 O 4 и PVDF+ Fe 3 O 4

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1 Diget Journal of Nanoaterial and Biotructure Vol. 5, No 3, July-Septeber 21, p STRUCTURE AND MAGNETIC PROPERTIES OF NANOCOMPOSITES ON THE BASIS PE+Fe 3 O 4 и PVDF+ Fe 3 O 4 М. А. RAMAZANOV *, R. А. ALI-ZADE a, P. B. AGAKISHIEVA a Baku State Univerity, Azerbaidjan a Intitute of Phyic, NАS of Azerbaijan H.Javid Str. 33, Baku Az-1143, Azerbaidjan The tructure and agnetic propertie of nanocopoite have been tudied on the bai PE + Fe 3 4 and PVDF + Fe 3 O 4. It wa etablihed that coagulation Fe 3 O 4 nanoparticle in polyeric atrix depend on it concentration a well a uperolecular tructure and crytallization degree of polyer. It i uppoed that change of nanocopoite pecific agnetization depend of agnetic field intenity and type of polyeric atrix, i connected with a diverity of diaagnetic aniotropy, uperolecular tructure and crytallization degree of polyer PE and PVDF. Theoretical calculation how that the geoetrical ( d t ) and agnetic( d ) diaeter of nanoparticle linearly depend on it geoetrical diaeter and thee reult are in agreeent with the experiental data. (Received July 25, 21; accepted Augut 3, 21) Keyword: PE+Fe 3 O 4, PVDF+Fe 3 O 4, Magnetic propertie, Superolecular tructure, Polyer 1. Introduction Lat decade the copoite on the bai of polyer and ferroagnetic are widely ued in radio engineering, TV, counication engineering, torage device, coputer, becaue their relatively high agnetic and exploitation propertie [1-3]. Polyeric copoition aterial are copoed of agnetic particle, other functional filler and polyeric atrix, in which thee particle are ituated. The atrix define the tructure of nanoparticle aebly (ize ditribution of nanoparticle, ditance between the, their hape, ordering etc.), and the tructure of fored nanocopoite define the propertie of nanocopoite. Polyeric atrix tabilize active nanoparticle, the propertie of thee nanoparticle principally differ fro the bulk aterial. The nanocopoite propertie are defined by cheical nature of polyeric atrix, tructure of large interphae part and the interaction between nanoparticle and polyeric atrix. They are interetig fro the point of view of their tructure and propertie a well a for practical application. In cae of low concentration of nanoparticle in the atrix, nanocopoite are uperparaagnetic, due to the direction of weak agnetization axe, which are ditributed randoly. High concentration of nanoparticle in the atrix reult to a reaction between the, that for infinite conductive cluter, and the nanocopoite exhibit ferroagnetic propertie. In thi article wa tudied the ize of agnetite nanoparticle in polyeric atrix. The ize of agnetite nanoparticle ha been defined by agneto-granuleetric ethod and AFM canning. The reult of different ethod are haronized well. It i etablihed that ize of agnetite nanoparticle depend on their concentration in polyeric atrix and polyer crytallization rate.

2 Exaple and experiental ethod Magnetic polyeric nanocopoite prepared in diethylforaide olution of PVDF nanoparticle uppleented with Fe 3 O 4. The average ize of nanoparticle i 4-1 n. The reaction i achieved at the teperature of 343К till eulion foration, and then i added water and after eparation of Fe 3 O 4, contained PVDF, the ixture i dried in evacuated veel. The aple of nanocopoite were obtained by hot preing ethod at PVDF elting point under 15 MPa preure during 1 inute with further cooling to roo teperature at different rate. In trichloralethylene olution of PE nanoparticle of Fe 3 O 4 are added at the teperature of 343 К. Preparation and phyical propertie of PMNC are decribed in [4, 5]. Micro tructure of copoition PVDF+Fe 3 O 4 have been tudied by AFM ethod. Magnetization of PMNC aple, prepared on the polyeric bai (PVDF) and (PE) at different concentration of agnetite wa tudied by Doenically ethod. 3. Experiental and theoretical reult The agnetization curve of PMNC on the bai PVDF with volue concentration of agnetite nanoparticle φ =.11 are hown in Fig.1. The agnetization of the aple ha uperagnetic character a een in Fig.1. It i known that agnetization of the ediu can be decribed by Langeven equation: M H ϕ L d (1) kt ( H ) = M f ( ) H H 1 where L = cth - function of Langeven, f () - function of ditribution of kt kt H kt agnetite nanoparticle on agnetic oent, ϕ concentration of agnetite nanoparticle in the ediu. The agnetic oent of agnetite nanoparticle i defined a = M V i, where M agnetization of atiation of aive agnetite which i equal 491,6 ка/м, V i volue of agnetite nanoparticle. Fig.1 The agnetization of the aple PVDF+Fe 3 O 4 (1%), obtained by experiental ethod (curve 1) and calculation ethod (curve 2).

3 729 Fig. 2. The dependence of agnetic diaeter of nanoparticle aggloeration on it concentration in polyeric atrix: 1-PVDF+Fe 3 O 4, 2- PE+Fe 3 O 4 For the definition of the agnetite nanoparticle in the ediu wa ued Langeven ' ' equation at high agnetic field M = ϕ M, where M - aturation agnetization of the aple. H 3H Applying expanion of Langeven function at low agnetic field L = and kt kt definition average agnetic oent = f ( ) d : 3H M ( H ) = M ϕ. kt By definition the initial agnetic uceptibility of the ediu i dm ( H ) 3 ax χ = = M ϕ, then we can define axiu agnetic diaeter ( d ag ). H kt H d ax 72 = ag χ ktμ 2 M ϕ 1 3 Applying the data of agnetic eauring ( ) H. (2) χ,ϕ, we defined axiu agnetic diaeter of nanoparticle at variou concentration in polyeric atrix. The dependence of agnetic diaeter of nanoparticle coagulant fro their concentration in polyeric atrix i hown in Fig.2. The dependence of d fro φ i linear, with increaing concentration increae agnetic diaeter it ean nanoparticle coagulate can be oberved in Fig.2. However the coagulation of the particle depend not only on it concentration, but alo depend on uperolecular tructure and degree of crytallization. Change of the uperolecular tructure of PVDF i larger than the one for PE.

4 73 Fig.3 The agnetization of the aple PVDF+Fe 3 O 4 (curve 1), PE+ Fe 3 O 4 (curve 2). Fig.3 The agnetization of the aple PE+ Fe 3 O 4 in variou cooling regie. 1. β=3deg/in (BО) 2.β=4deg/in (МО) The value of agnetic diaeter are variou for the ae concentration of nanoparticle in PVDF and PE (φ =.17) a een in Fig.2 The curve of agnetization PMNC on the bai PVDF and PE with part per volue concentration of agnetite nanoparticle φ =.11. The agnetization of the aple PVDF+Fe 3 O 4 and PE+Fe 3 O 4 ha uperparaagnetic character (Fig.3,4). Specific agnetization for nanocopoite on the bai PVDF i higher than the one for PE bai. It hould be noted PVDF and PE have got diaagnetic propertie they are diaagnetic. However agnetic propertie of C-F and C-H bond in acroolecule PVDF and PE are different [6]. Magnetic perception depend on uperolecular tructure of polyer and crytallization degree. Change of pecific agnetization depending on agnetic field and polyeric atrix type can be link with difference of diaagnetic aniotropy, uperolecular tructure and crytallization degree of polyeric atrix PVDF and PE.

5 It i etablihed experientally that pecific agnetization of Fe 3 O 4 nanoparticle in the polyer alo depend on teperature-duration regie of polyer crytallization (Fig.4). The value of pecific agnetization of PE+Fe 3 O 4 change depending on teperature-duration regie of polyethylene crytallization, it ean pecific agnetization of PE+Fe 3 O 4 increae with declining of teperature-duration regie of polyethylene crytallization a een in Fig.4. The analyi of agnetization curve hown (Fig.4) the axiu ize of nanoparticle coagulant for in variou cooling regie of polyer (1. β=3deg/in (BО) 2.β=4 deg/in (МО)) are equal correpondingly 21 n, 15,7 n. May be the ize of agnetite nanoparticle coagulant depend on the rate of polyer cooling. In cae with great cooling rate it for all ize coagulant. 731 а) b) Fig..5 АFМ iage of nanocopoite urface PVDF+ Fe 3 O 4 and ize of Fe 3 O 4 nanoparticle a) β=4deg/in b) β=3deg/in. The Fe 3 O 4 nanoparticle ize, topography of ditribution of nanoparticle in polyeric atrix for the aple, obtained in regie β=4 deg/in and β=3 deg/in. A it hown on the pic.5 ize of Fe 3 O 4 nanoparticle, fored in variou cooling regie of polyer (1. β=3deg/in 2.β=4 deg/in ) are equal correpondingly 21 n and 15 n a een in Pic.5. The analyi of propertie of nanocopoite urface PE+Fe 3 O 4 and hitogra of value of eleent iage are hown in Pic.6. The ean-quare urface roughne of nanocopoite i approxiately 15-3 n a een Pic.6. AFM canning how that nanoparticle Fe 3 O 4 are equally ditributed in polyeric atrix. It hould be noted in foring of nanocopoite propertie play a great role interphae interaction between atrix and filler. Microcopic heterogeneity of polyeric atrix tructure i conditioned by peculiaritie of interaction of atrix and filler during copoite crytallization proce. Fig. 6. Analyi of propertie of nanocopoite urface and hitogra of value of eleent iage.

6 732 There i oe change of tructural icro heterogeneity for crytallized polyer PE and PVDF a a reult of interaction on the border, which differ fro icro heterogeneity in polyeric atrix and change of tructural icro heterogeneity for PE and PVDF are variou. The can of PE+ Fe 3 O 4 nanocopoition obtained by Aoic-Force Microcope and Magnetic Force Microcope. Here agnetic addition i taken a volue aount γ =,25 i hown in Pic.7 Invetigation the agnetite congloerate copoed of nanoparticle howed that it geoetrical ize obtained by AFM i ufficiently aller than the geoetric ize obtained by MFM. I wa find the agnitude of coefficient K by experiental way and thi i appropriate with experiental reult. Thu it wa found that a coagulation of Fe 3 O 4 nanoparticle in polyeric atrix varie depending not only on the voluetric quantity of nanoparticle but alo on the urface-olecular tructure and crytallization degree of polyer. Fig.7. 2D can and ize of PE+ Fe 3 O 4 nanocopoition with γ =,25 voluetric quantity of agnetic addition. a) AFM can b) MFM can We had proved theoretically earlier, that urface interphae layer of agnetite nanoparticle ha no agnetic propertie [7]. Thickne of interphae layer i directly proportional to the diaeter of nanoparticle. Geoetrical ( d t ) and agnetic diaeter ( d ) of nanoparticle are connected to each other by equation d = K d t. Then agnetic volue of congloerate coniting of n nanoparticle can be defined a follow: 3 ( 1 K ) = V (1 ) π d tn πd n = πd otn t K (3) If preent the congloerate of n nanoparticle a one nanoparticle then agnetic volue can be defined a: π d t πd = πd t ( 1 K ) = Vt (1 K ) (4) The right ide of thee equation are equal. It ean the agnetic diaeter of nanoparticle coagulant alo linearly depend on it geoetrical diaeter. Thu the reult obtained for agnetic diaeter of nanoparticle coagulant are copatible to it geoetrical ize.

7 Concluion It wa etablihed that coagulation of Fe 3 O 4 nanoparticle in polyeric atrix depend on it concentration a well a uperolecular tructure and crytallization degree of polyer. The change of nanocopoite on the bai PE + Fe 3 O 4 and PVDF + Fe 3 O 4 pecific agnetization depending of agnetic field intenity and type of polyeric atrix, i connected with a diverity of diaagnetic aniotropy, uperolecular tructure and crytallization degree of polyer uperolecular tructure and crytallization degree of polyer PE and PVDF. Theoretical calculation have hown, that geoetrical ( d t ) and agnetic ( d ) diaeter of nanoparticle linearly depend on it geoetrical diaeter and thee reult haronize very well with experiental data. Acknowledgeent The work i executed at financial by upport of project BSU 5/5 Reference [1] A. D. Poogailo, A. S. Rozenberg, U. E. Uflyand Nanocale etal particle in polyer. Mocow, "Cheitry", 2, 671p. [2] Y. I. Petrov Cluter and all particle. Mocow, Science, 1986, 124p. [3] L.V. Nikitin, L. S. Mironova and etc. Magnetic elaticity, tructure and agnetic deforation propertie of agnetic-elatici. J.VMS. v.46(а), 3. с498 [4] А. M. Magarraov, М.А.Raazanov, R.Z. Sadikov, R.A. Ali-zade Magnetic polyer nanocopoite on the bae of PVDF+Fe 3 O 4 Nanotekhnika, 25, 4, стр [5] А. M. Magarraov, М.А.Raazanov, P.B.Agakihiyeva, F.V.Hajiyeva Influence icrotructure to agnetic propertie of polyer nanocopoite on the bae of Fe 3 O 4. Platic Ma 28, 1, стр [6] A. D. Stadnik, G. V. Kirik Polyer copoite and nanocopoite in agnetic field. Sui, 25, 239с. [7] R. A. Ali-zade Magnetite nanoparticle with an antiferroagnetic urface layer. Inorganic Material, 42(11), 1215 (26).