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Metodyka wyznaczania wybranych charakterystyk barwienia polietylenu z wykorzystaniem systemu CIELab

Chorobiński Mateusz, Skowroński Łukasz, Bieliński Marek

Polimery

2019

T. 64, nr 10

690--696

Przedstawiono oryginalną metodę przygotowywania barwnych próbek z polietylenu, wykorzystaną do oceny zmiany barwy w skali CIELab, w wyniku zmieszania wybranych barwników. Do weryfikacji i oceny zmienności barwy serii próbek PE z udziałem czterech pigmentów (R, G, B, Y) wykorzystano spektrofotometr Cary 5000 rejestrujący widma odbiciowe odzwierciedlające efekt wzajemnego mieszania stosowanych w badaniach koncentratów barwiących.

The paper presents the original method for the preparation of polyethylene samples used to assess the color change in the CIELab scale, by using a mixture of selected dyes. In order to verify and evaluate the color variability of a series of PE samples with four pigments (magenta, blue, green, yellow), the Cary 5000 spectrophotometer was used for recording reflectance spectra of individual samples demonstrating the effect of mutual mixing of the dyeing concentrates used in the study.

Biodegradable polyester blend and copolyesters studied by positron annihilation and other methods

Dębowska M., Rudzińska-Girulska J., Serwadczak M., Kiersnowski A., Pigłowski J.

Nukleonika

2010

Vol. 55, No. 1

57-64

Two polyesters, i.e. an aromatic one: poly(butylene terephthalate) – PBT and an aliphatic one: poly(ĺ- -caprolactone) – PCL were mixed in melt to obtain a biodegradable product. DSC, 1H NMR, SEM, WAXS, SAXS, BOD and PALS measurements were performed to study the homopolymers as well as their physical blend and copolyesters. The latter were obtained due to the transesterification reaction. Ortho-positronium (o-Ps) annihilation lifetimes were used to create the distributions of free volume. The progressive changes in probability density function of free volume, i.e. increase in large free volume holes contribution to the total free volume, appearing when going from the homopolymers to the blend and then to the copolyesters reflect the influence of: the addition of aliphatic polyester, the weight fraction of it in the composition and transesterification. The higher contribution of larger free volume holes corresponds well with the reduced crystallinity of compositions revealed in X-ray diffraction and the worsening of the regularity of structure of the macromolecules involved in formation of crystals, deduced from the 1H NMR.