Processing of LDPE, effect

Figure 9. Effect of processing time on the melt-flow index (MFI) of LDPE. (1) open chamber (excess air) (2) closed chamber (limited oxygen access) (3) closed chamber purged with argon (inert atmosphere).

Figure II. Effect of processing on the molecular weight distribution of LDPE (numbers on curves indicate processing times at 150°C min in an open chamber)...

LDPE (85) / EVAc (15) / DCP RI (1) internal mixer at 150-210°C / torque rheometry / effects of processing conditions on crosslinking / DSC / FTIR / DMA Vogel and Heinze, 1993... 

LCA is an important process for evaluating the effects that a product has on the environment over the entire period of its hfe. We evaluated LCA by comparing total CO2 (life cycle CO2) exhaust from production of Bionolle and of conventional resins like LDPE. From this analysis, Bionolle has turned out to be more a environmentally friendly resin than LDPE. The effectiveness of the starch-Bionolle compound has also been confirmed. 

In another part of this study we wished to see the effects of post-modification treatments on the properties of the modified LDPE surface. Polyethylene samples were photosulfonated for different periods of time. Afterwards they were subjected to an after-treatment by conditioning in an electrolyte solution (aqueous KC1, 10-3 M) for 48 hours and then characterized by zeta potential measurements. This conditioning process resulted in a shift of f to even less negative values (see Fig. 8). This finding may be explained by the swelling of the polymer samples (water adsorption) in water that causes a shift of the shear plane of the electrochemical double layer into the liquid phase. This effect demonstrates that storage conditions and pre-conditioning may exert a pronounced influence on the zeta potential recorded for surface-modified polymers. Phenomena of this kind have already been described in previous literature [26,27],... 

EfFect of trcinsition metal acetylacetonates on the oxidation of LDPE during processing and on UV irradiation... 

Figure 4. Effect of irradiation time on functional group concentration in LDPE. Processing times in parenthesis.

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