Kopolimerisasi Grafting Campuran N-Isopropilakrilamida dan Glisidil Metakrilat pada Film Polietilen yang Diinduksi oleh Sinar Ultraviolet

Abstract

Liquid phase ultraviolet irradiation was used to graft the mixtures of N-isopropylacrylamide and glycidyl methacrylate to a linear low-density polyethylene film (thickness of 30 μm) surface. Xanthone was used as photoinitiator, which was coated on the film surface earlier. The surface of the grafted polyethylene samples were characterized by attenuated total-reflection IR spectroscopy and scanning electron microscopy. Elemental analysis indicated that the NIPAAm fraction with respect to GMA in the graft copolymer increased with increasing NIPAAm ratio in the comonomer feed solution. The reactivity ratios of NIPAAm and GMA monomers determined in the present graft copolymerization system were found to be 0,31 ± 0,1 and 4,8 ± 0,2, respectively. It was found that the epoxy groups of GMA-grafted chains in the NIPAAm/GMA-grafted films have the ability to react with ethylenediamine (En). The aminated NIPAAm/GMA-grafted film had an excellent ability to adsorb cupric ion. The temperature-responsive character of the resulting grafted films was evaluated by measuring the water absorbency of the grafted NIPAAm/ GMA when immersed in water and/or methanol at 5 to 50 0 C.

Pengaruh konsentrasi inisiator kalium persulfat dan monomer asam akrilat terhadap persen grafting karet alam/starch

“…(Sumber: Laksanawati, 2019) Konsentrasi inisiator mempunyai peranan penting dalam pembentukan situs aktif dalam polimer. Semakin besar konsentrasi inisiator kalium persulfat yang digunakan, maka akan semakin besar juga situs aktif (makroradikal) yang terbentuk pada karet alam lateks untuk menginisiasi polimerisasi grafting (Suka dan Wasinton, 2007).…”

“…Ketika monomer semakin banyak, maka intensitas tumbukan antar molekul asam akrilat besar, sehingga laju propagasi rantai poli asam akrilat radikal akan menjadi cepat. Hal ini mengakibatkan dalam menghasilkan rantai poli asam akrilat radikal menjadi cepat sehingga pati termodifikasi asam akrilat menghasilkan persen grafting yang besar (Suka dan Wasinton, 2007).…”