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Study on change of color and some properties of high density polyethylene/organo-modified calcium carbonate composites exposed naturally at Dong Hoi-Quang Binh

Le Duc Minh, Nguyen Thuy Chinh, Nguyen Vu Giang, Tong Cam Le, Dau Thi Kim Quyen, Le Duc Giang, Thai Hoang

Abstract


This paper presents the study on the UV-Vis spectra, change of color and some properties of high density polyethylene/organo-modified calcium carbonate (HDPE/m-CaCO3) composites exposed naturally in Dong Hoi district, Quang Binh province (Vietnam). From June 2014 to June 2016, the samples of HDPE/m-CaCO3 composites were tested naturally on outdoor shelves at Dong Hoi sea atmosphere region (at Dong Hoi, Quang Binh). The change of UV-VIS spectra, color and some properties of the HDPE/m-CaCO3 composites depend on geographic, weather and climatic factors (solar radiation, temperature, humidity, etc.). In the UV-VIS spectra, the band at 265 nm showed the formation of the carbonyl groups such as ketone, lactone carbonyl and aliphatic ester which were occurred in photo-degradation process of HDPE/m-CaCO3 composites. The results of color change indicated the surface of the samples of HDPE/m-CaCO3 composites was lightened continuously with increasing natural exposure time and increased in total color difference value and significant loss in both redness and yellowness. Da*, Db* values and electrical breakdown of HDPE/m-CaCO3 composites were decreased while their Dl*, DE, dielectric constant and dielectric loss were increased with rising natural exposure time. Dielectric constant of HDPE/m-CaCO3 composites was in the range of 1.75 to 2.1 and dielectric loss of HDPE/m-CaCO3 composites went up from 1.7 to 3.2 for 0 to 24 months. The electrical breakdown of HDPE/m-CaCO3 composites reduced due to the decrease in the relative crystalline degree of the samples caused by the scission photo-degradation of HDPE macromolecules in HDPE/m-CaCO3 composites for natural exposure time.

Keywords. HDPE/CaCO3 composites, photo-degradation, natural exposure, color change, electric properties, UV-Vis spectroscopy.


Keywords


HDPE/CaCO3 composites, photo-degradation, natural exposure, color change, electric properties, UV-Vis spectroscopy

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