Abstract
Sustainability goals are essential driving principles for the development of innovative materials in the construction industry. Natural fibers represent an attractive alternative as reinforcing material due to good mechanical properties and sustainability prerequisites. The study has been focused on the comparative investigation of chemical and physical treatments of hemp hurds and their influence on the thermal behavior of main hemp constituents in air and nitrogen atmosphere. Thermal decomposition of hemp hurds involves several parallel reactions related to heat and mass transfer processes. A comparison of DSC and TG/DTG results of hemp hurds samples before and after treatments demonstrates a better thermal stability for treated samples. It is caused by changes in chemical composition due to a partial removal of non-cellulosic components from hemp hurds structure, an increase in cellulose content and decrease in its degree of polymerization. The results show different thermal behavior of the hurds samples heated under nitrogen and air atmosphere. Based on DTG records, several-stage process of mass loss has been found for the samples under air, whereas only two-stage process under nitrogen.
Highlights
The increasing global energy consumption, economic crisis and environmental risks have encouraged research on the exploitation of renewable raw materials resources for production of environmentally friendly materials
A comparison of differential scanning calorimetric analysis (DSC) and TG/ DTG results of hemp hurds samples before and after treatments demonstrates a better thermal stability for treated samples. It is caused by changes in chemical composition due to a partial removal of non-cellulosic components from hemp hurds structure, an increase in cellulose content and decrease in its degree of polymerization
The results show different thermal behavior of the hurds samples heated under nitrogen and air atmosphere
Summary
The increasing global energy consumption, economic crisis and environmental risks have encouraged research on the exploitation of renewable raw materials resources for production of environmentally friendly materials. The hotspot interest in the use of rapidly renewable raw materials resources such as vegetable fibers with high tensile strength as a good reinforcing component and/or organic filler into composite materials for automotive [1] and building sector [2, 3] is recorded. For utilization of natural materials in buildings, their thermal stability has to be taken into account. Composites based on biomass usually have better thermal properties than corresponding components in the system [4]. Extensive research has showed the complexity of thermal decomposition reactions of natural fibers due to the complex structure of the lignocellulosic material representing heterogeneous mixture of organic compounds [9]. Different reaction schemes and approaches have been considered for a better interpretation of biomass degradation process [10]
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