A r ticle ID:042727104(2007)0520634201
reactive materials studiesR 282B y ;,F ,2f @N anostr uctured Functional Ther moplastic Polymer ic Mater ials
B ased on the Molecular Control of the B lending
E.Pa ssaglia 1,M.B ertol do 2,S.Coi ai 3,S.Augi er 4,
F.Ciardelli 2,4
(1.I CCOM 2CNR Pisa Section ;2.Po lyL ab 2CN R;  3.  C.I.P.Porto Mar gher a ;4.Dipa rtimento di
Chimica e Chimica I ndust riale ,U niv ersit àdi Pisa ,Via Risorgi mento 35,Pisa 56126,I taly )
K eyw o r ds :poly olefins;nanocomposites;con finement
CLC number :O 626    　
1　Results
The development of t he concept s of nanot echnology has gi ven an important i mpact on t he design of
new polymer based mat erials which are i n most cases characterized by a mul tiphase morphology.When at least one phase has nanomet ric dimension (s )the system can be c onsidered as a nanocomposite where the int erface i s not only det ermini ng for t he adhesion but also may play a role in some bulk properties.Indeed in nanost ruct ured mult iphase solids t he i nterface is significant as a bulk c omponent.Therefore t he basic driving force necessary to reach such unique morphology i s derived from t he proper molecular design of t he molecular functionali ty which can provide interphase i nteractions.
In our previous studies [1-2]regardi ng t he blending of hydrophobic pol yolefi ns wit h other polymers wit h hi gher hydrophilicit y ,c ompatible blending and good i nteraction at t he int er face were obt ained by one st ep or t wo steps reacti ve blending allowi ng t he formation of a graft ed copolymer as i nterface active agent.
In t he case of t he preparation of nanoc omposi tes st arti ng also from polyolefi ns but usi ng i norganic com 2pounds as potentially nanodi spersed phase we have used t he same concept s [3].As i n t hese systems t he forma 2tion of graf t copolymer cannot occur ,t he presence of a polyolefin wit h proper f unct ional groups i s necessary for the i nterface adhesion and stabilization of t he nanostructured morphology .In some cases t he i nteracti ng polymer chain can show a different behav
iour i n respect to t he starti ng material.
Acc ording to thi s approach moderately crystalline ad practically amorphous et hylene polymers were used by t hemselves or in combination wit h t hei r functionalized derivatives beari ng carboxylate groups ,for t he preparation [1]of nanocomposi tes t hrough melt mixing wit h organophilic mont morillonites.Also propylene polymers wit h f unct ional groups and polyolefin coated synthetic nanoparticles provided int erest ing routes for t he preparation of nanocomposit es by reactive blendi ng.
The morphology of t he nanocomposites and t he variation of s olubilit y and T g of the clay bonded polyolefi n were tent atively att ributed to t he gradient of int eractions bet ween t he macromolecular chai ns wit h particular reference to t hose i nvolving the gra fted carboxylate gr oups and the surface of differently organized nanolayers.
References :
[1]　S C oiai ,E Passaglia ,M Ag lietto ,et al.Macromo lecules ,2004,37:8414.
[2]　M B Coltelli ,M Angiuli ,E Passaglia ,et a l.Macromolecules ,2006,39:2153.
[3]　E Passag lia ,R Su lcis ,F Ciardelli ,et al.Polym I nt ,2005,54:154921556.
第46卷　第5期
2007年10月复旦学报(自然科学版)Journal of Fudan U niversity (Natural Science )Vol.46No.5Oct.2007eceived da te :2007014
iogra ph :E.Passaglia Corres pondence aut h or .Ciardelli E mail :ciard dcci.uni pi.it.

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