دراسة انعكاسات التحلل بفعل الدقائق الحامضية العالقة في هواء المدن على متراكبات النوفولاك

Abstract EN

The study tries to illustrate the most important danger of urban air pollution by acid particles ,and its effect on rain, which often turn it into sulfuric acid or sulfurous .

Then it studies the problem of their impact on the Novolak composites, which work extensively in an open environment, especially in areas with industrial activity.

The study focuses on the role of those pollutants, which used in certain concentrations in traces images reflect on the composites resistance of the flexural creep at the time of dropping the load.

The composites were prepared by reinforcing the Novolak material, by glass fibers one time and asbestos glass the other time.

In addition, hybrid composites, by reinforcing Novolak material, with the pervious fibers (30% glass fibers +asbestos glass) were prepared.

These samples were prepared in two different rates from the solid material (HMTA), which represented once by (10%) weight and (14%) weight the other time, in order to notice the effect of the solid material on the flexural creep to the preparing models.

The rate of the weight fraction of all materials was 60%.

It is clear from the study that the resistance of the Novolak material to the flexural creep can be improved, by reinforcing it with fibers, and increasing the rate of (HMTA) because of their importance in raising the rate of the flexural creep strain loss % in addition to the effect of the loss on raising the value of coefficient of flexural creep modulus of the resin material.The results show that, there are many factors help in polymeric composites decomposition .The most important factor is the high rate of the moisture content of the pure rain, which has 6.8 acidic functions (collected in Iraq -Alkadhimiya) in the polymeric composite substance .It is clear that the flexural creep strain increased ,with the accumulation of liquids .

So that the effect of this increasing, when the value of coefficient of flexural creep reduced will be clear.

The research tries to ascertain that the danger implied in the assimilation of the prepared composites of (PH) exponent of value less than (6.8).

It is proved practically from the study that the collected rain from (Baghdad -Aldwoora) of (PH) exponent of value (6.3), which rose the lose value of coefficient of flexural creep.

This lose doesn’t stop at this point, but the reducing of (PH) value of the unpolluted water from 6.8-5 once and 2.31 another time in the laboratory ,cause increasing in coefficient of flexural creep lose rate.

So that the Novolak composite exposing to the rain characterized in raising in the acidic degree ,when it is on the effect of continuous loading that increase creeping.