Preparation of High Molecular Weight Poly(methyl methacrylate) with High Yield by Room Temperature Suspension Polymerization of Methyl Methacrylate원문보기
Lyoo, Won-Seok
(School of Textiles, Yeungnam University)
,
Noh, Seok-Kyun
(School of Chemical Engineering and Technology, Yeungnam University)
,
Yeum, Jeong-Hyun
(Department of Dyeing and Finishing, Kyungpook National University)
,
Kang, Gu-Chan
(Department of Dyeing and Finishing, Kyungpook National University)
,
Ghim, Han-Do
(Department of Dyeing and Finishing, Kyungpook National University)
,
Lee, Jinwon
(Department of Chemical Engineering, Kwangwoon University)
,
Ji, Byung-Chul
(Department of Dyeing and Finishing, Kyungpook National University)
To obtain high molecular weight (HMW) poly(methyl methacrylate) (PMMA) with high conversion, methyl methacrylate (MMA) was polymerized in suspension using a room temperature initiator, 2,2'-azobis(2,4-dimethylvaleronitrile) (ADMVN), and the effects of polymerization conditions on the polymerization ...
To obtain high molecular weight (HMW) poly(methyl methacrylate) (PMMA) with high conversion, methyl methacrylate (MMA) was polymerized in suspension using a room temperature initiator, 2,2'-azobis(2,4-dimethylvaleronitrile) (ADMVN), and the effects of polymerization conditions on the polymerization behavior of MMA and the molecular parameters of PMMA were investigated. On the whole, the experimental results well corresponded to the theoretically predicted tendencies. These effects could be explained by a kinetic order of ADMVN concentration calculated by an initial rate method and an activation energy difference of polymerization obtained from the Arrhenius plot. Suspension polymerization at 25℃ by adopting ADMVN proved to be successful in obtaining PMMA of HMW (number-average degree of polymerization (P/sub n/): 30,900-36,100) and of high yield (ultimate conversion of MMA into PMMA: 83-93 %) with diminishing heat generated during polymerization. The P/sub n/ and lightness were higher and polydispersity index was lower with PMMA polymerized at lower temperatures.
To obtain high molecular weight (HMW) poly(methyl methacrylate) (PMMA) with high conversion, methyl methacrylate (MMA) was polymerized in suspension using a room temperature initiator, 2,2'-azobis(2,4-dimethylvaleronitrile) (ADMVN), and the effects of polymerization conditions on the polymerization behavior of MMA and the molecular parameters of PMMA were investigated. On the whole, the experimental results well corresponded to the theoretically predicted tendencies. These effects could be explained by a kinetic order of ADMVN concentration calculated by an initial rate method and an activation energy difference of polymerization obtained from the Arrhenius plot. Suspension polymerization at 25℃ by adopting ADMVN proved to be successful in obtaining PMMA of HMW (number-average degree of polymerization (P/sub n/): 30,900-36,100) and of high yield (ultimate conversion of MMA into PMMA: 83-93 %) with diminishing heat generated during polymerization. The P/sub n/ and lightness were higher and polydispersity index was lower with PMMA polymerized at lower temperatures.
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제안 방법
In this study, a room-temperature initiator, 2, 2'-azobis(2, 4- dimethylvaleronitrile) (ADMVN), which can lower the polymerization temperature down to room temperature [18-22] was selected in suspension polymerization of MMA to obtain HMW PMMA with high yield. The effects of polymerization conditions on the polymerization behavior of MMA and molecular parameters of PMMA were investigated.
In this study, to identify the effects of polymerization temperature and conversion on the molecular weight distribution of the PMMA polymerized, the poiydispersity index was obtained through GPC experiments. Figure 7 shows results.
성능/효과
By suspension polymerization of MMA at 25 ℃ by ADMVN, HMW PMMA with Pn of 30, 900-36, 100 and with maximum conversion of MMA into PMMA of 83-93 % was produced. The Pn and lightness were higher and poiydispersity index was lower with PMMA polymerized at lower temperatures.
Figure 7 shows results. From the fact that the poiydispersity index were lowest at 25 ℃, which are 1.8-2.4, it was concluded that room temperature suspension polymerization of MMA produced linear ultra- HMW PMMA with high yield. Pn and poiydispersity index of PMMA polymerized at 25 ℃ in suspension were 31, 200 and 2.
00005 mol/mol of MMA. Therefore, it can be concluded that the suspension polymerization of MMA at room temperature using low temperature initiator ADMVN is an effective method to increase both yield and molecular weight at the same time.
Through a series of calculation using initial-rate method, it was found that the suspension polymerization rate of MMA at 25 ℃ was proportional to the exponent 0.81 of ADMVN concentrations.
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