Radiation grafting of hydrophilic monomers onto poly(4‐methylpentene‐1), II. Grafting of long chain monomers and physical properties of the grafted films

Soebianto, Yanti S.; Yoshii, Fumio; Makuuchi, Keizo

doi:10.1002/apmc.1987.051520114

Cited by 13 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Pencangkokan dilakukan setelah polimer diiradiasi (pencangkokan iradiasi awal) [3]. Agar terjadi reaksi kimia antara bagian aktif polimer dan monomer maka pencangkokan metoda iradiasi dilakukan dalam suasana vakum [4] atau jenuh gas nitrogen [2].…”

Section: Pendahuluanunclassified

Sintesis Bahan Membran Sel Bahan Bakar: Kopolimerisasi Stirena Pada Film Etfe Dengan Teknik Iradiasi Awal

Yohan¹,

Nur²,

Hendrajaya³

et al. 2010

MST

View full text Add to dashboard Cite

AbstrakTelah dilakukan pencangkokan monomer stirena pada film ETFE dengan teknik iradiasi awal. Penelitian dilakukan dengan cara meradiasi film ETFE dengan sinar-γ pada variasi dosis total radiasi dari 2,5 sampai 12,5 kGy dan variasi laju dosis dari 1,3 sampai 1,9 kGy/jam. Kemudian kopolimer teriradiasi dicangkok menggunakan monomer stirena dalam berbagai pelarut etanol, 2-propanol, dan toluena dengan variasi konsentrasi dari 20 sampai 70% volume, suhu pencangkokan dari 50 sampai 90 o C, dan waktu pencangkokan dari 2 sampai 12 jam. Hasil penelitian menunjukkan bahwa persen pencangkokan meningkat dengan meningkatnya dosis total radiasi dan menurunnya laju dosis radiasi. Diperoleh kondisi optimum percobaan pada dosis total 10 kGy, laju dosis 1,9 kGy/jam, pelarut 2-propanol, stirena 40% volume, waktu pencangkokan 4 jam, dan suhu pencangkokan 70 o C. AbstractSynthesis of Fuel Cell Membrane: Copolymerization of Styrene on ETFE Film by Grafted pre-Irradiation. Preirradiation Grafting styrene monomer on ETFE film has been prepared. Research has been performed by γ-ray radiation at various total dose from 2.5 -12.5 kGy and various dose rate from 1.3 -1.9 kGy/hour. Irradiated copolymer is then grafted by styrene monomer in various solvent: ethanol, 2-propanol, and toluene, various concentration from 20 -70% volume, various temperature from 50 -90 o C, and various grafting time from 2 -12 hours. The results showed that percent of grafting is increase with increase of total dose and decrease of rate dose. The optimum experiment conditions are obtained at total dose 10 kGy, dose rate 1,9 kGy/hour, 2-propanol solvent, 40% volume styrene, 4 hours grafting time, and 70 o C grafting temperature. Keywords: grafted pre-irradiation, fuel cell, ETFE Film PendahuluanSel bahan bakar (fuel cell) adalah salah satu sumber energi listrik yang ramah lingkungan. Alat ini bekerja dengan cara mereaksikan hidrogen dan oksigen untuk menghasilkan listrik dengan hasil samping air. Teknologi sel bahan bakar yang sekarang tengah diupayakan adalah pembuatan sel bahan bakar secara langsung, artinya bahan bakar hidrokarbon bisa langsung digunakan tanpa harus melalui suatu reformer. Hal ini dapat dilakukan dengan membuat media membran penukar proton [1].Membran yang dimaksud menjadi komponen yang sangat penting dalam polymer electrolyte membrane fuel cell (PEMFC). Hal tersebut dimungkinkan karena peran komponen ini dalam menahan umpan (gas H 2 ) dan menjadi sarana transportasi ion hidrogen yang dihasilkan oleh reaksi anoda menuju katoda sehingga reaksi katoda yang menghasilkan energi listrik dapat terjadi. Saat ini membran yang digunakan terbuat dari fluoro-polimer, yaitu politetrafluoroetilena (PTFE), dengan rantai cabang mengandung gugus asam sulfonat dan dikenal dengan nama dagang Nafion ® . Kemampuan Nafion ® untuk menahan gas H 2 dan menghantar proton sudah terbukti sangat efisien. Namun, untuk mengembangkan PEMFC lebih lanjut, penggunaan terhadap bahan ini secara tekno-ekonomi menjadi kendala karena mahal dan secara teknis bahan ini masih kurang...

show abstract

Section: Pendahuluanunclassified

Sintesis Bahan Membran Sel Bahan Bakar: Kopolimerisasi Stirena Pada Film Etfe Dengan Teknik Iradiasi Awal

Yohan¹,

Nur²,

Hendrajaya³

et al. 2010

MST

View full text Add to dashboard Cite

show abstract

Synthesis of hydrophilic elastomers by radiation grafting

Soebianto

Yoshii

Makuuchi

1987

Angew. Makromol. Chem.

View full text Add to dashboard Cite

Radiation grafting of acrylic acid (AAc) onto ethylene‐propylene rubber (EPR) to obtain hydrophilic elastomers has been investigated. It was found that by addition of alcohol (methanol and 1‐propanol) into water as solvent for grafting the degree of grafting increased and formation of homopolymer was retarded. The grafting by addition of alcohol occurred even in deeper portions of the film compared with no addition of alcohol. Grafting rate differed largely with propylene contents in the EPR. Graft polymerization occurred easily in EPR of lower propylene contents such as 22%. Before introducing AAc in grafting the stability of EPR radicals of lower propylene contents was higher in comparison with other components. Water absorption of EPR increased linearly with increasing grafting yield.

show abstract

Radiation‐induced graft polymerization of styrene onto poly(3‐hydroxybutyrate) and its copolymer with 3‐hydroxyvalerate

Bahari

Mitomo

Enjoji

et al. 1997

Angew. Makromol. Chem.

View full text Add to dashboard Cite

Graft copolymerization of styrene (St) onto poly(3-hydroxybutyrate) (PHB) andpoly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(HB-HV)) was carried out using simultaneous irradiation and pre-irradiation techniques with 6oCo y-rays. The degree of grafting (X,) of styrene onto PHB increased with increasing pre-irradiation dose and grafting temperature while in the graft reaction of the copolymer, X, was higher at 50°C than at 70°C. This X, was lower than that in grafting methyl methacrylate (MMA) onto PHB and its copolymer. In the electron spin resonance (ESR) study, the PHB radical formed by irradiation was converted to a propagating radical by introducing St monomer at room temperature (25 "C) for grafting. The propagating radical was observed even at 50°C and 70"C, grafting of St onto PHB occurs actively at such temperatures. The decay of the radical concentration during grafting well corresponded to radical consumption in graft polymerization. The molecular weight (Mn) depended on the grafting conditions and the increase of the grafting temperature induced the formation of reduced M, because of early termination. It was confirmed that the increase of X, in pre-irradiation of more than 10 kGy was due to the increment of the graft chain. ZUS AMMENFASSUNG: Die Pfropfcopolymerisation von Styrol (St) auf Poly(3-hydroxybutyrat) (PHB) und auf dessen Copolymeres Poly(3-hydroxybutyrat-co-3-hydroxyvalerat) (P(HB-HV)) wurde unter gleichzeitiger Anwendung von Bestrahlungs-und Vorbestrahlungstechniken mit 60Co-y-Strahlung durchgefuhrt. Der Pfropfungsgrad (X,) von Styrol auf PHB erhohte sich mit zunehmender Vorbestrahlungsdosis und Pfropfungstemperatur. Dagegen lag der Pfropfungsgrad des Copolymeren bei 50 "C hoher als bei 70°C. Verglichen mit der Pfropfung von Methylmethacrylat auf PHB und dessen Copolymeres wurden mit Styrol geringere Pfropfungsgrade erzielt. ESR-Untersu-

show abstract

Radiation grafting of hydrophilic monomers onto poly(4‐methylpentene‐1), II. Grafting of long chain monomers and physical properties of the grafted films

Cited by 13 publications

References 6 publications

Sintesis Bahan Membran Sel Bahan Bakar: Kopolimerisasi Stirena Pada Film Etfe Dengan Teknik Iradiasi Awal

Sintesis Bahan Membran Sel Bahan Bakar: Kopolimerisasi Stirena Pada Film Etfe Dengan Teknik Iradiasi Awal

Synthesis of hydrophilic elastomers by radiation grafting

Radiation‐induced graft polymerization of styrene onto poly(3‐hydroxybutyrate) and its copolymer with 3‐hydroxyvalerate

Contact Info

Product

Resources

About