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Determination of the glass transition of polymer by the autovibron
Author(s) -
Murayama Takayuki
Publication year - 1982
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760221209
Subject(s) - glass transition , materials science , crystallinity , polymer , dynamic mechanical analysis , tangent , dissipation factor , spectrum analyzer , dynamic modulus , thermodynamics , analytical chemistry (journal) , composite material , optics , physics , mathematics , chromatography , chemistry , optoelectronics , geometry , dielectric
The automated Rheovibron (Autovibron) has been useful for determining the glass transition behavior of polymers. The standard (manual Rheovibron viscoelastometer has been used sufficiently small intervals, and so, some accuracy on transition location must be sacrificed when the temperature intervals are taken 5 to 10°C apart. However, the Autovibron can be observed over very small temperature intervals (<1.5°C)), which essentially provide a continous monitoring of the changes in storage modulus, loss modulus, and tan δ. An improved accuracy and sensitivity of the Autovibron are provided by a combination of multiprogrammer, programmable calculator, and lock‐in analyzer. The Autovibron are provided by a combination of multiprogrammer, programmable calculator, and lock‐in analyzer. The Autovibron shows a good capability for dynamic thermomechanometry. The glass transition bility for dynamic thermomechnometry. The glass transition of polymers can be determined by analyzing the loss tangent peak. The maximum value in loss tangent, peak temperature, and the newly introduced terms, Δ T 1 and Δ T 2 which indicate the widths of tan δ peak, are useful indicators of the glass transition. The Δ T 1 and Δ T 2 show the distribution of the glass transition and are related to order and crystallinity in the structure.