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This is different from the behavior of PS, suggesting a much smaller contribution of irreversible chain scissions in this much tougher polymer, in agreement with the GPC results.
Crystallinity increased on an average by a quantity corresponding to 45 methylene groups per chain scission event.
Figure 11a presents data for the number of chain scissions as a function of exposure time.
In the first group, the UV radiation changes the chemical structure of the polymer inducing chromophoric groups and such process is not accompanied by scission of the backbone of the polymer chain.
Comparing predried and non predried powders with a storage time of 64 h shows reduced further crystallization as well as chain scission if water is excluded from the powder, Fig.
Les autres partis ne sont pas en reste oo cependant la grogne n'a pas encore vire a la scission ou a la dissidence, comme c'est le cas du Front populaire dont le dirigeant Mongi Rahoui s'est vu offrir un portefeuille ministeriel dans le gouvernement de Youssef Chahed.
As concluded in a previous work [43], the polymer chains with low molecular weights are attributed to PC chains after their scissions occurring during the grafting reaction.
The physical reason for the first two formulas in (9) is the releasing macromolecules from crosslinks by either seldom scission of crosslinks or by overwhelming scissions of surrounding them chains.
The number of chain scissions (n) and the crosslinks (x) per mass unit of aged HDPE samples can be evaluated from Eqs.
Les scissions a repetition ont eu raison du CPR : au moins deux partis qui en sont issus font desormais cavalier seul, nommement Wafa et le parti en gestation de Mohamed Abbou , et plusieurs groupes parlementaires ont vu leurs rangs [beaucoup moins que] s'enrichir [beaucoup plus grand que]de ses transfuges .
La gauche s'est effritee dans des scissions dechirantes, la gauche s'est amenuisee et renfrognee au fil des annees pour avoir boude, dans nombre de composantes, les Institutions et des centres de decision, aussi aberrants soient-ils.
The number of chain scissions s and crosslinks x par mass unit are given by (9):