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Study of improved crack toughness of unsaturated polymers with rice husk fiber and sago flour as strengthening materials
Full text linkThe development of environmentally friendly composites from
natural fibers is an absolute thing to do to replace non-degradable
synthetic composites. Some of the weaknesses of natural fiber
composites are low mechanical strength, ease of cracking, no
moisture resistance, and high-temperature resistance. One of the
things that has been done is to make a combination of synthetic
materials as a matrix derived from unsaturated polyester
reinforced with natural fibers from crushed rice husk particles and
starch from sago flour which is used to reduce the percentage of
synthetic materials to be able to form composites that are easily
decomposed. From the research, it was found that the strength of
crack resistance could be increased with a mixture of polyester
reinforced with rice husk fiber and sago flour, obtaining an
increase in crack resistance strength until the addition of rice husk
with a percentage of 15%. While increasing the RH content above
15%, the crack strength value decreases due to the saturation of
the RH molecules in the Unsaturated Polyester (UP) which is no
longer bound to the UP molecules. The highest crack strength
values occurred for adding the percentage of RH and SS to the UP material with the addition of 5% SS, which obtained a cracking force of 550 N while the strength of pure polyester was only 37 N. This shows that RH and SS materials can bond with UP molecules and some molecules of RH and SS can prevent cross-linking of polyester molecules. Meanwhile, adding SS up to 10% decreases the fracture force obtained, indicating that not all of the sago starch can bind to the polyester molecules
