Processing LDPE, effect

S-IPO (1% IPO) (10-90) extraction / DSC / mechanical properties vs. processing conditions / effects of diluting with unfunctionalized LDPE and PS / effect of zinc chloride catalyst Baker and Saleem, 1987 a, b... 

In contrast, see the right side of the plot, low density polyethylene, as produced by a high-pressure process, shows the expected correspondence of Tc and Tm, because the abundant presence of side groups in LDPE effectively hinders sliding diffusion of the branched chains throu the crystallites and, because of that much less reorganization occurs. 

In contrast, the addition of LDPE or PS to the mixture had Httie effect on its behavior in the Conrad process. 

In another study [31] it has been reported that haze of LLDPE is mainly a consequence of light scattered by the spherulites. Thus, origin of poor clarity is not the same in LLDPE as in HP LDPE. In HP LDPE the haze is produced by surface defects coming from processing rheology [48,54,55]. Processing variables, therefore, do not have the same effect on LLDPE as they do on HP LDPE. 

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. 

To reduce these effects, LDPE samples were cross-linked by e-beam irradiation and then subjected to the photosulfonation process. Compared to standard LDPE, crosslinked LDPE displayed a higher content of — SO3H groups and higher surface polarity after photosulfonation. This was evidenced both by zeta potential and contact angle measurements. It is thus demonstrated that sample pretreatment by crosslinking provides more stable surfaces which maintain their polar properties during water contact. This is explained by a lower amount of extractable components as a result of radiation-induced network formation. 

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