Natural Polymer Based on Biodegradable HMAs

Starch is a fully biodegradable natural polymer, which has a wide variety and a wide range of resources, so it is an ideal natural renewable materials. Depending on the plant, starch generally contains 20% to 25% amylose and 75% to 80% amylopectin. [94] 

Similar to the PLA and/or PCL HMA, the natural polymer based HMA can also be applied in packaging. Saara Inkinen et al. [81] discussed the stability of blends of a lactic acid-based hot melt adhesive (LHM), oxidized potato starch (dried or nondried) and polyethylene glycol (PEG). Table 6.4 shows the stress and strain at maximum load values of the samples, and Figs. 6.12, 6.13 and 6.14 are several test results. The test results suggest that the HMA can meet the requirements for packaging. Blumenthal et al. [95] successhilly prepared a 

Stein Winfried Chem et al. [98] prepared a HMA that was based on glutin glue, plasticiser optionally and other ordinary additives. The HMA can bond porous materials, especially wood, paper, cardboard or foamed plastics. It is useful in the production of packaging. The constituents of the HMA are not harmful when the bonded articles are recycled and are easily degraded in sewage plant. 

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