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what LDP and HDP signify? how are they prepared ?
what LDP and HDP signify? how are they prepared ?
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Solution
LDP stands for low density polythene and HDP stands for high density polythene.
Low density polythene is obtained by the polymerisation of ethene under high pressure of 1000 to 2000 atmospheres at a temperature of 350 K to 570 K in the presence of traces of dioxygen or a peroxide initiator (catalyst)
High density polythene is obtained by the polymerisation of ethene in a hydrocarbon solvent in the presence of a catalyst such as triethylaluminium and titanium tetrachloride (Ziegler-Natta catalyst) at a temperature of 333 K to 343 K and under a pressure of 6-7 atmospheres.
LDP stands for low density polythene and HDP stands for high density polythene.
Low density polythene is obtained by the polymerisation of ethene under high pressure of 1000 to 2000 atmospheres at a temperature of 350 K to 570 K in the presence of traces of dioxygen or a peroxide initiator (catalyst)
High density polythene is obtained by the polymerisation of ethene in a hydrocarbon solvent in the presence of a catalyst such as triethylaluminium and titanium tetrachloride (Ziegler-Natta catalyst) at a temperature of 333 K to 343 K and under a pressure of 6-7 atmospheres.
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