Radiation‐induced grafting of styrene onto FEP. films: Structure and thermal behaviour of copolymers

Wiley - Tập 210 Số 1 - Trang 151-164 - 1993
Bhuvanesh Gupta1, Günther G. Scherer1
1Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

Tóm tắt

AbstractThermal characteristics of radiation‐grafted FEP‐g‐polystyrene copolymer films were evaluated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The grafting of polystyrene onto FEP film introduced a two‐step degradation pattern where polystyrene degradation occurred in the range of 400–460°C beyond which the loss in the FEP component was observed. DSC studies showed that the heat of fusion was reduced in the grafted FEP samples. This was attributed to the dilution of inherent crystalline zones by the incorporation of amorphous polystyrene grafts into the amorphous region of the FEP matrix. The melting temperature, on the other hand, remained constant for the entire range of graft levels (0–40%). All the copolymer films exhibited two glass transition temperatures (Tg) each corresponding to the FEP and polystyrene moieties. However, the Tg in grafted films were found to be higher as compared to that in ungrafted FEP and homopolystyrene films. These results have been explained in terms of the decrease in the segmental mobility of macromolecular chains in the grafted films.

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Tài liệu tham khảo

Chapiro A., 1962, Radiation Chemistry of Polymeric Systems

10.1016/S0011-9164(00)88631-2

10.1016/0376-7388(92)80029-J

10.1002/app.1967.070110817

10.1016/0146-5724(77)90072-3

10.1002/app.1981.070261132

10.1016/0014-3057(84)90133-2

10.1016/0146-5724(83)90114-0

10.1016/0014-3057(87)90085-1

Bozzi A., 1988, Radiat. Phys. Chem., 32, 193

10.1002/app.1982.070270217

10.1002/app.1983.070280420

10.1016/0011-9164(87)87027-3

10.1016/0376-7388(93)85033-S

10.1002/pol.1984.180220807

Zaitsev N. B., 1975, Vysokomol. Soedin., Ser., 17, 1130

10.1002/app.1988.070360106

10.1002/pol.1962.1206117109

10.1002/app.1969.070130409

10.1002/app.1966.070100110

10.1016/0014-3057(92)90049-8

B.Gupta G. G.Scherer unpublished results

Sobue H., 1971, Asahi Garasu Kogyo Gijutsu Shoreikai Kenkyu Hokoku, 18, 23

1972, C. A., 76, 113814

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Wiley

Tập 210 Số 1

151-164

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