STUDYING REACTIVITY RATIOS AND PHYSICAL PROPERTIES OF METHACRYLIC ACID - ETHYL ACRYLATE COPOLYMER

Tran Vu Thang, Pham Thi Thu Ha, Nguyen Van Khoi, Nguyen Van Manh, Pham Thi Thu Trang

Abstract


The copolymerization of methacrylic acid (MAA) and ethyl acrylate (EA) was performed by free radical polymerization in ethanol, in the presence of 2,2-azobisisobutyronitrile (AIBN) as an initiator. The reactivity ratios of monomers were caculatured by Kelen-Tudos method using data from elemental analysis. The charaterstics of the copolymes were studied by IR spectroscopy, DSC, gel permeation chromatography (GPC) and TGA analysis methods. The results showed that MAA has higher reactivity than EA (rMAA = 2.63 and rEA = 0.21), glass transiton temperature of copolyme Tg = 146 oC, the average molecular weight of the copolymers Mw = 251000 (u) and the polydispersity index (PDI) Mw/Mn = 1.70.


Keywords


copolymerization, reactivity ratios, methacrylic acid, ethyl acrylate, 2,2-azobisisobutyronitrile.



DOI: https://doi.org/10.15625/0866-708X/53/2/4002 Display counter: Abstract : 58 views.

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Published by Vietnam Academy of Science and Technology