A Study of Specific Heat Capacity Functions of Polyvinyl Alcohol–Cassava Starch Blends

Abstract

The specific heat capacity (C sp ) of polyvinyl alcohol (PVOH) blends with cassava starch (CSS) was studied by the differential scanning calorimetry method. Specimens of PVOH-CSS blends: PPV37 (70 mass% CSS) and PPV46 (60 mass% CSS) were prepared by a melt blending method with glycerol added as a plasticizer. The results showed that the specific heat capacity of PPV37 and PPV46 at temperatures from 330 K to 530 K increased from (2.963 to 14.995) J · g −1 · K −1 and (2.517 to 14.727) J · g −1 · K −1 , respectively. The specific heat capacity of PVOH-CSS depends on the amount of starch. The specific heat capacity of the specimens can be approximated by polynomial equations with a curve fitting regression >0.992. For instance, the specific heat capacity (in J · g −1 · K −1 ) of PPV37 can be expressed by C sp = −17.824 + 0.063T and PPV46 by C sp = −18.047 + 0.061T , where T is the temperature (in K).

High moisture strength of cassava starch/polyvinyl alcohol-compatible blends for the packaging and agricultural sectors

“…Higher concentrations of amylose present better mechanical properties in relation to structure with a high content of amylopectin, comments the author, which still asserts a more practical and economic use of a blend with higher amount of starch. In this sense, Sin et al [67] showed through FT-IR analysis that the hydrogen bonds between PVA and starch are stable, and the high concentration of PVA in relation to starch makes the system more stable and compatible. The mechanical behavior, analyzed as a whole considering the TB, showed that the blend 80P20A presented the best result once the elongation Analyses have showed (Fig.…”

Synergetic effects of nano-SiO2/glycerol on the electrical and optical properties of PVA for embedded electronics and optical applications

“…Although glycerol (Gl) has been commonly used as a polymer plasticizer [24][25][26], some researchers have studied the effect of glycerol addition on the electrical properties of polymers. Based on impedance analysis, Ayala et al reported that the DC conductivity of cassava starch biopolymer was very sensitive to glycerol addition up to 50 wt% [27].…”