Question

why are bioplastics are not much in use

Answer 1

There are various reasons why bio plastics are not in much use till now.
(1) Biodegradable plastics produce methane gas on decomposition while using for landfill. Methane gas is a potential green house gas.
(2) Biodegradable plastics and bioplastics do not decompose readily. They need high temperature and may take many years. Also they leave behind toxic residues.
(3) Bioplastics and biodegradable plastics cannot be recycled easily.
(4) Moreover bioplastics, biodegradable plastics and compostable are some terma which appear similar to general public but they are different categories of plastics. THese have different times for degradation.