Biến tính hữu cơ clay montmorilonit K10 bằng hợp chất azo có chứa nhóm sunfonic axit

Nội dung bài viết cho thấy sự xen kẽ của methyl cam phân tử giữa các lớp silicat. Phân tích Thermogravimetric cho thấy hàm lượng hữu cơ trong đất sét KIODC là 25,3%. SEM quan sát chứng minh rằng trong đất sét KIODC các tiểu cầu silicat được tách ra tốt hơn sau đó trong đất sét nguyên sơ. Kết quả phân tích XRD chỉ ra rằng lớp phủ epoxy chứa 2% đất sét KIODC là intercalated nanocomposite.
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Biến tính hữu cơ clay montmorilonit K10 bằng hợp chất azo có chứa nhóm sunfonic axitTap chi Hoa hgc, T. 47 (3), Tr. 287 - 291, 2009BIEN TINH Hijru CO CLAY MONTMORILONIT K10 BANG HOPCHAT AZO CO CHLTA NHOM SUNFONIC AXITDenTda sogn 29-8-2008tJiVTO THI X U A N H A N G , T R I N H ANH TRUC, PHAM GIA VUVien Ky thugt nhiet ddi, Vien Khoa hgc vd Cong nghe Viet NamABSTRACTClay montmorillonite KIO was organically modified by cation exchange reaction with methylorange. The clay modified hy methyl orange (KIODC) was characterized by infraredspectroscopy. X-ray diffraction, thermogravimetric analysis and scanning electronic microscopy.The epoxy coatings containing 2% clay KIODC was prepared and the dispersion degree of clay incoating was evaluated. Structure analysis by infiared spectroscopy indicated that vibrationbands at 1601 cm and 1389 cm characteristic of C-H bond in aromatic ring and C-N bond ofmethyl orange were also found in the spectra of clay KIODC. XRD analyze showed that the dgoispacing of clay-KlODC was 16.1 A. These results indicate the intercalation of methyl orangemolecules between silicate layers. Thermogravimetric analyze showed that the organic content inclay KIODC was 25,3 %. SEM observation demonstrated that in clay KIODC the silicate plateletsare better separated then in pristine clay. XRD analyze results indicated that epoxy coatingcontaining 2 % clay KIODC was intercalated nanocomposite.I-MODAUTrong nhtrng nam g i n day vat lieu polymeclay nanocompozit thu hiit dugc su quan tam ratldn ciia cae co sd nghien citu cung nhu san xuat.Chi vdi lugng rat nhd clay hiiu ca (3 - 5%) dalam tang ding k i cie tinh nang ciia vat lieu nhudo bin keo, kha nang chiu nhiet chdng chay,kha nang che chin, bao ve chdng an mdn [ 1 - 8 ] .Clay hitu co thudng dugc che tao tii claymontmorillonite la loai cd kha nang trao ddi ioncao bang phin ilng trao ddi ion vdi c i e loaication ankylamonium. Trong c i e cdng trinhtrudc day chiing tdi da nghien ciiu bien tfnh hiiuca clay bang lie che an mdn la mdt amin cdchifa eac nhdm photphonat nhim ifng dungtrong ldp phii nanocompozit bao ve chdng anmdn cho thep cacbon [9, 10]. Cac ket qua thudugc eho thay clay-ATMP cd k h i nang tuangtic va tad ming bao ve tren b i mat thep. Su cdmat ciia clay bien tinh bing triaminophotphonicaxit d ndng do 2 % da tang ding ke kha nangbao ve chdng an mdn ciia mang epoxy.Trong cdng trinh nay chting tdi nghien ciiuhim CO hoi clay KIO bang metyl da cam la hgpchat azo cd chii:a nhdm chile sunfonic axit SOjH, nhim ifng dung clay hiru ea trong ldp phiibio ve chdng an mdn. Clay dugc hiiu co h o ibing phan ilng trao ddi ion. Ciu triic ciia clayhiiu ca che tao dugc phan tfch bang phd hdngngoai, phd nhiiu tia X va kinh hiin vi dien tifquet. Kha nang phan tan ciia clay bien tfnh trongnen epoxy duac danh gia bing phd nhiiu xa tiaX.II - THUC NGHIEM1. Nguyen lieu-I- Clay montmorillonit sif dung la clay KIOciia hang Sigma-Aldrieh.287-I- Metyl da cam la loai PA ciia Trung Qudc.2. Hiiu CO hoa clay bang metyl da cam [9]Clay KIO (10 g) dugc phan tin trong nudeeat bing miy khuay tii, eho them 0,5 ml axitclohydrie bao hoa va 7 g metyl da cam vao,khuay tiep trong 24 gid d nhiet do phdng. Clayhiiu CO hoa dugc tich ra vi rita bing nudc eateho den khi khdng edn ion CI (thif bang ionbac). Clay bien tinh duge siy trong chan khdngd nhiet dd 40°C trong 2 ngay.3. Phuang phap pho hong ngoaiCau triic ciia clay trudc va sau khi hiiu cahoa duge dugc phan tfch bing phd hdng ngoaitren may Nicolet Nexus 670 d viing budc sdngtil 4000 em den 400 cm ciia Vien Ky thuatnhiet ddi. Clay duac do vdi dang ep vien vdiKBr.4. Phd nhieu xa tia XPhd nhiiu xa tia X cua clay dugc do trenmay Siemen D5000 sit dung tia nhiiu xa CuKacd budc sdng X= 1,5416 A.5. Phuang phap phan tfch nhietGian dd phan tfch nhiet cua clay duge dotren may phan tfch nhiet Shimadzu TGA-50Mtai phdng phan tich nhiet, Vien Hda, Vien Khoahoe va Cdng nghe Viet Nam. Tdc do tang nhietla 10°C/phtit trong khoang 0-700°C.6. Phuang phap kinh hien vi dien tu quetcau triic ciia eac hat clay va bi mat ciia ldpphil duac phan tfch bing kinh hien vi dien titquet (SEM ) tren may HITACHI S4800 tai VienVat lieu, Vien Khoa hgc va Cdng nghe VietNamIII - KET QUA VA THAO LUANClay KIO dugc bien tfnh bang metyl da camnhd phan iing trao ddi cation gitia clay va metylda cam. Cau triic ciia clay trudc va sau khi bientinh duge phan tteh bing phd hdng ngoai, phonhiiu xa tia X, phan tich nhiet va kfnh hien vidien quet.J* JIM J1. Pho hong ngoaiFTinh 1 trinh bay phd hdng ngoai ciia clayKIO, metyl da cam (MDC), clay KIO bien tinhmetyl da cam (clay KIODC).So song (cm)Hinh 1: Phd hdng ngoai ciia clay KIO, metyl da cam (MDC) va clay KIODC288Tren phd hdng ngoai, ta thay rd clay KIO cdcae pie dae trung eiia lien kit Mg-O, Al-O, vaSi-O tuong ifng tai viing 468 em, 525 cm va1051 cm [11]. Metyl da cam ed cie pic dactrung cho cic lien kit S=0 tai 1187 cm, daoddng khung benzen tai 1607 cm va lien ketC-N tai 1367 cm.Phd hdng ngoai ciia KIODC cung cd cac picdae trung cho clay tai 466 cm (Mg-O), 523em (Al-O) va 1035 cm (Si-O). Ngoii ra cacpic dac trung cho dao ddng khung vdng benzen,va lien ket C-N cting xuat hien tai 1601 cm vi1389 cm tren phd KIODC. Ket qua phan tfch bing phd hdng ngoai chothay metyl da cam da duoc chen vao trong clayKIO.Him lugng hiru ea trong clay bien tfnh dugcxac dinh bing phuang phip phan tich nhiet.Giin dd phan tfch nhiet eiia clay KIO vi KIODCduge trinh bay tren hinh 3.TGA {%)1002. Phd nhieu xa tia XKhoang cich ldp ciia clay KIO trudc va saukhi biin tfnh metyl da cam duge phan tfch bingphd nhiiu xa tia X. Hinh 2 trinh bay phd nhiiuxa tia X cua clay KIO va KIODC. Ta thiy vdiclay ban diu KIO cd pic tai tuong ttng vdikhoang each ldp 10 A dac trung eho eau triicmica va pic tuang tfng vdi khoang ea ...