Effects of Treatment Temperature on Properties of Starch-based Adhesives

Abstract

Starch-based adhesives were developed by hydrolyzing starch with polyvinyl alcohol under alkaline and acidic conditions at various treatment temperatures. The chemical and physical structures of the corn starch and hydrolyzed starch were characterized with Fourier Transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and scanning electronic microscopy (SEM). Thermal degradation and bond strength were also evaluated. The results indicated that the bond strength of starch adhesives reached a maximum value at 40 °C. The FI-IR results showed that the amount of hydroxyl groups first increased and then decreased with increasing treatment temperature. When the treatment temperature was 55 °C the crystallinity of treated starch was the lowest and the thermal resistance also the weakest; it decreased by 10.1% and 13.6% respectively compared to untreated starch. Obvious erosion could be observed from the SEM images of treated starch. In addition, the interaction of polyvinyl alcohol (PVA) and starch also could be observed, and the results indicated that the compatibility between starch and PVA became better and better as the treated temperature was increased.

Modified Starches as Direct Compression Excipients – Effect of Physical and Chemical Modifications on Tablet Properties: A Review

“…Starch is a carbohydrate polymer derived from the organs, such as roots, tubers, seeds, and fruits of various botanical sources, for example cassava, potato, yam, corn, beans, peas, unripe pawpaw, and banana. It is a highly abundant, renewable, and biodegradable polymer and acts as a source of energy for these plants . Starches are known as polysaccharides because they consist of polymers of d ‐glucose, the basic unit of starch (Figure ).…”

Mechanical Properties of 3 Ply Plywood Made fromAcacia MangiumVeneers and Green Starch-based Adhesives

“…It also showed that structure and elasticity of the cassava starchbased is being destroy when temperature increasing to 140 o C. Uthumporn et al [3] stated that different starches have different gelatinization temperature and while the starch under alkali and acid treatment with increasing temperatures could influence gelatinization temperature of starch. According to Yu et al [4], granules morphological changes is effected by heating temperature than compared with heating time, while increase in alkali concentration, gives a strong impression on the swollen granules than neutral and acid conditions.…”

“…In contrast, bar graph showed fluctuation when cassava starchbased adhesive in plywood increased with hot press temperature, bond strength decreased first, then increased again. Yu et al [4] mentioned that treatment temperature of starchbased adhesive was increased and bond (shear) strength of starch-based adhesive between veneers also increased first, and then decreased in bond strength. This is because of the amount of free hydroxyl groups was presented on starch molecular chain.…”

Formulation of Cassava Starch-Based Adhesive.

“…5 Starch is made up of two molecules: amylose and amylopectin. Amylose consists of long helical chains, and amylopectin has a branched structure.…”