Thermal Properties and Side Chain Crystallinity of Styrene and n-Alkyl Methacrylate Terpolymers

被引:9
|
作者
Karazija, Tomislav [1 ]
Vidovic, Elvira [1 ]
Jukic, Ante [1 ]
机构
[1] Univ Zagreb, Fac Chem Engn & Technol, HR-10000 Zagreb, Croatia
来源
POLYMER ENGINEERING AND SCIENCE | 2013年 / 53卷 / 11期
关键词
INCORPORATING OCTADECYL ACRYLATE; GLASS-TRANSITION TEMPERATURES; MONOMER REACTIVITY RATIOS; METHYL-METHACRYLATE; RADICAL COPOLYMERIZATION; NANOPHASE SEPARATION; MELTING TRANSITIONS; RELAXATION; BEHAVIOR; FUSION;
D O I
10.1002/pen.23599
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Differential scanning calorimetry method was used for the study of thermal properties of terpolymers of styrene (ST) or methyl methacrylate (MMA) with dodecyl methacrylate and octadecyl methacrylate. Particularly, the interdependencies of the crystallinity content and composition of terpolymers were examined. The increase of the MMA or ST content in terpolymers resulted in the increased glass transition temperatures and decrease of the ratio of crystalline relative to amorphous phase (from 10% for x(MMA) = 10 mol% to 5.7% for x(MMA) = 30 mol%, and from 8.5% for x(ST) = 16 mol% to 4% for x(ST) = 40 mol%). These kinds of copolymers are commonly used as flow improvers at low temperatures for lubricating mineral oils; therefore a direct correlation between flow behavior of polymer solutions in mineral oil (pour point) and side-chain crystallinity of copolymers was examined. Thus, by increasing the proportion of crystalline phases, i.e. the long-chain alkyl methacrylates in copolymer, the pour point of oil solutions lowers. Thus, the solution of terpolymer with crystalline phase content of 4 mol% displays the pour point of -9 degrees C while in those with crystalline phase content higher than 7 mol% pour point lowers below -30 degrees C. POLYM. ENG. SCI., 53:2299-2307, 2013. (c) 2013 Society of Plastics Engineers
引用
收藏
页码:2299 / 2307
页数:9
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