Coordination Polymer: Synthesis, Spectral Characterization and Thermal Behaviour of Starch-Urea Based Biodegradable Polymer and Its Polymer Metal Complexes

Table 7

(a) ASTM standards of biodegradable polymeric compounds.

Environment	ASTM	Microorganism
Single species	D5247-92, G-21, G-22	Species of bacteria and fungi specified
Sewage sludge	D5209-91, D5271-92	Aerobic-activated sludge organisms
Marine environment	D5437-93	Marine algae and invertebrates
Compost pile	D5338-93	Thermophillic microbes in compost
Anaerobic environment	D5210-92	Anaerobic micros from activated sludge

(b) % CO₂ mineralization of starch, SUr, and its polymer metal complex.

Time (Hrs)	CO2 Mineralization %
	Starch	Polymeric resin	Polymer metal complex
24	—	4.8	4
44	1.6	7.5	7.1
68	2.2	11	8
92	3.7	14.5	9.7
110	5	18	12.8
136	9	22.5	14.5
160	15	27	17.2
187	18.5	27.4	17.3
200	18.6	27.5	20.4

(c) Biodegradability of starch, SUr and SUr-Mn(II).

Material	Biodegradability rate constant (k)	Total Wt. loss (gm)	Medium
Starch	0.001297	0.0108	Biotic
SUr	0.00196	0.01527	Biotic
SUr-Mn(II)	0.001163	0.00906	Biotic