Rotational viscosimetry and oscillatory rheometry were used in this study to analyze the resins behavior under different mass conditions.
As the stop criteria in the viscosimetry and rheometry tests were defined as at verification of gelation and 100 Pa s, respectively, the actual cycle implemented in the LY556 resin consisted in a first dwell at 30 C (303 K) and a second dwell at 80[degrees]C (353 K).
measurements on solubilized samples were carried out both on extruded chips and on samples tested in dynamic rheological measurements at two different times (3 and 13 min).
The molar mass distributions (MMD's) of the PET samples were determined by using the method of size exclusion chromatography (SEC) with triple detection: concentration, viscosimetry, and light scattering.
The present paper investigated changes of the molar mass distribution during a multistep uniaxial drawing procedure of PET by means of size exclusion chromatography (SEC) with triple detection that is concentration, viscosimetry and light scattering.
GPC coupled with intrinsic viscosimetry
and NMR have not been revealed as suitable techniques to detect small amounts of LCB.
However, in high shear viscosimetry
(like extrusion capillary rheometry), the mechanically induced disentangling effect must be also considered.
Viscosimetry was measured using a Ubbelohde size 2 viscosimeter at a temperature of 30 [degrees] C to obtain [M.
This extracted portion was characterized by viscosimetry and a [M.