Manganese stearate

Manganese stearate. ) Copper stearate. ) Cerous stearate. 

Fig. 91 CL curves recorded for LDPE (1), LDPE + SBR (2) and LDPE + NR (3). Temperature 100°C.Environment air. Concentration of pro-oxidant compounds manganese stearate 1 % SBR or NR 2 wt.%. The data were taken fi-om [OlKl].

According to the actual trends in additive use in polymers, a system composed of starch and a prooxidant such as manganese stearate with a styrene-butadiene copolymer as compatibilizing agent was developed [70, 73]. 

TABLE 2 Identified degradation products formed in LDPE /Master batch (starch, a pro-oxidant as manganese stearate with styrene-butadiene copolymer as compatibilizing agent), Starch-EMA and LDPE during different aging times in water, air and thermal aging [72, 74, 75]... 

Pyrolysis-gas chromatography (Py-GC) of LDPE gives details of its microstructure, and is a versatile tool to show the extent of degradation. Two LDPE were investigated one was LDPE with a masterbatch consisting of LDPE, corn starch (7.7%), and prooxidant (SBS-1 manganese stearate) (LDPE-MB) the other was 30 pm films of pure LDPE with pro-oxidant (LDPE-PO). 

Pomerantz, M. and Siegmuller, A., High resolution X-ray diffraction from small numbers of Langmuir-Blodgett layers of manganese stearate, Thin Solid Films, 68, 33, 1980. 

Typical prooxidant transition metal compounds (e.g. iron, cobalt or manganese stearates) are used commercially to induce peroxidation in degradable plastics. However, such prooxidants alone have no practical utility in commercial products unless the prooxidants are deactivated during polymer fabrication, since oxidative degradation begins during... 

Metal-initiated auto-oxidation reactions are also used with limited success to induce relatively fast biodegradation of polyethylene (PE) and polypropylene (PP). Basically as a result of oxidation, there is C-C bond cleavage, and the long polymer molecules are broken down into smaller fragments that are more easily bioassimilated. The metal complexes commercially used for this purpose are usually iron, cobalt, and manganese stearates, and other carboxylates or dithiocarbamate complexes (see Section 1.6.3). 

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