Multiple Glass Transitions of Block Polymers. II. Differential Scanning Calorimetry of Styrene-Diene Block Copolymers

Study of Microphase Separation in Block Copolymers of Styrene and α-Methylstyrene in the Glass Transition Region Using Quantitative Thermal Analysis

“…Most studies were restricted to locating glass transitions; only in a few investigations has the quantitative increase in heat capacity at the glass transition, ACp, been measured. 14,21,26 No heat capacity measurements on block copolymers over wider temperature ranges have been reported before in the literature. In this paper the heat capacities of the phase-separated block copolymers are calculated from the homopolymers by assuming additivity of the heat capacity of the blocks.…”

Properties of low molecular weight block copolymers. 4. Differential scanning calorimetry and refractive index-temperature measurement on styrene-butadiene diblock copolymers and styrene-butadiene-styrene triblock copolymers

“…The HDT was not equal to that of high molecular weight PS even when Mns exceeded 105. Using DSC measurements, Ikeda et al 13 found variations from 99 to 105 °C in the Tg s of the S microphases in S-B-S and B-S-B triblock copolymers with Mns from 5 X 104 to 9.7 X 104, but the T's did not show a trend with Mns. Kraus and Rollmann"4 in a dynamic mechanical study of S-B-S and B-S-B triblock copolymers found that the Tg of the S microphases decreased as Mw decreased from 3.5 X 104 to 4 X 103, was virtually independent of whether the S blocks were in S-B-S or B-S-B block copolymers, and was less than that expected for PS of comparable molecular weight.…”

Synthesis and characterization of styrene/isoprene/ethylene oxide block copolymers

“…330 K, and a steplike broad region around 290 K. This steplike broad region is identified as the Tg of PI. 6 The sharp melting peak arises from melting of the PEO block. Since the PS is amorphous, no melting peaks corresponding to that block were observed.…”