A new UV Stabilizer and Anti Oxidant Chemically Bonded with Polyethylene from Polyresorcinol Prepared by a new Method
ABSTRACT
Polyresorcinol (PRE) can be used as U.V stabilizer additives for polyethylene (PE) which gives result’s better than chimassorb (Ciba) used at Sidpec company. Which after
150 hr inside weathering ometer for chimassorb the decrease in percent elongation at break are 12%, and for 0.06% PRE is 3.8%. But for 0.03% PRE is 2 %, for chimassorb the decrease in percent elongation at break is 33.8%, and for 0.06% PRE is 12%, but for 0.03% PRE is 2.5%. Finally after 300 hr inside weathering ometer, the decrease on percent elongation at break for chimassorb is 57.22%. In case of 0.06% PRE the percent elongation at break is decreased by 28.5%, this mean that PE with 0.06% PRE are still have a resistance to weathering condition’s but PE containing 0.06% chimassorb are completely degradable after 300 hr.
Before xenon test the compound of (PE+PRE) have low initial percent elongation at break which may be due to cross linking of (OH) groups with PE and not due to degradation as confirmed by DTA and FTIR. PRE are efficient UV stabilizer than chimassorb, and PRE used as anti oxidant.
Thermal analysis was studied for the compounds, DTA curves shows addition of PRE to PE cause increase in melting point of PE from 127.85 OC to 136.9 OC, also cause increase the energy of melting from 79.73 J/g to 107.5 J/g.