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"Dalam penelitian ini dilakukan sintesis polistirena-ko-poli(etil akrilat) dengan metode Atomic Transfer Radical Polymerization (ATRP) untuk mempelajari pengaruh konsentrasi stabilisator dan inisiator terhadap solid content dan viskositas, serta mempelajari pengaruh variasi komposisi monomer terhadap temperatur transisi gelas (Tg). Dari hasil penelitian didapatkan bahwa semakin tinggi konsentrasi stabilisator dan inisiator maka solid content dan viskositas akan semakin tinggi, dan pada variasi komposisi monomer tidak memberikan kecenderungan pada temperatur transisi gelas yang dihasilkan. Terbentuknya polistirena-ko-poli(etil akrilat) ditunjukkan oleh hasil karakterisasi dengan Fourier Transform Infra Red dan Differential Scanning Calorimetry yang terlampir dalam penelitian ini dan memiliki hasil tidak terbentuk homopolimer dari masing-masing monomer.

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In this research, the synthesis of polystyrene-co-poly(ethyl acrylate) by the method of Atomic Transfer Radical Polymerization (ATRP) has been done to study the effect of the concentration of stabilizers and initiators on the solid content and viscosity of them. Then, this experiment also studied the effect of variations of monomers composition on the glass transition temperature (Tg) of polystyrene-co-poly(ethyl acrylate). The result showed that the higher concentration of stabilizers and initiators were, the higher the solid content and viscosity of the copolymer was obtained. In addition, the monomers composition did not affect the glass transition temperature of the resulting copolymers. The formation of polystyrene-co-poly(ethyl acrylate) was characterized by Fourier Transform Infra Red and Differential Scanning Calorimetry and the results showed that the formation of two homopolymers did not appeared."

"Pada penelitian ini dilakukan sintesis polimer suspensi poli[stirena-ko-(butil akrilat)] melalui polimerisasi radikal bebas untuk mempelajari pengaruh komposisi monomer stirena dan butil akrilat terhadap temperatur transisi gelas (Tg) kopolimer, serta mempelajari pengaruh konsentrasi inisiator benzoil peroksida terhadap solid content, viskositas dan ukuran partikel kopolimer. Dari hasil penelitian diperoleh bahwa, komposisi monomer mempengaruhi nilai Tg kopolimer, dengan semakin banyak komposisi monomer stirena yang digunakan, semakin tinggi nilai Tg kopolimer yang dihasilkan. Komposisi monomer optimum diperoleh pada saat perbandingan komposisi antara stirena dengan butil akrilat 55:45, dengan Tg yang dihasilkan sebesar 38,18ºC. Konsentrasi inisiator mempengaruhi nilai solid content dan viskositas, akan tetapi tidak mempengaruhi ukuran partikel kopolimer. Konsentrasi inisiator optimum diperoleh pada saat konsentrasi inisiator 1% dari berat monomer total, dengan nilai solid content yang dihasilkan sebesar 39,34% dan viskositas kopolimer sebesar 781,25 centiPoise. Karakterisasi menggunakan FTIR, GPC dan DSC menunjukkan bahwa polimer suspensi poli[stirena-ko-(butil akrilat)] telah berhasil disintesis.

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In this research, suspension polymers of poly[styrene-co-(butyl acrylate)] synthesis was done by using free radical polymerization method to study not only the effects of various monomer composition of styrene and butyl acrylate on the glass transition temperature (Tg), but also to study the effects of various initiator concentration of benzoyl peroxide on the solid content, viscosity and particle size of copolymer. The result showed that monomer composition affected the Tg of copolymers. The more amount of styrene used, the higher value of Tg copolymers produced. Optimum monomer composition was obtained when the composition ratio between styrene and butyl acrylate 55:45, with the value of Tg of 38,18ºC. Initiator concentration affected the value of solid content and viscosity, but didn?t affect the particle size of copolymer. Optimum initiator concentration was obtained when the initiator concentration 1% from the total weight of monomers, with the value of solid content of 39,34% and the viscosity of 781,25 centiPoise. The FTIR, GPC and DSC result showed that suspension polymers of poly[styrene-co-(butyl acrylate)] has been successfully synthesized."