Wɔde nhyɛsoɔ kɛseɛ-low density polyethylene (HP-LDPE, a wɔatwa no tiawa sɛ LDPE) ayɛ mfiridwuma bɛboro mfeɛ aduɔson, ɛwom sɛ ɛnam sɛ wɔahu na wɔayɛ olefin polymerization catalysts nti, polyethylene ahodoɔ ne nea ɛfiri mu ba no ayɛ kɛseɛ. Nanso, polyethylene a ɛwɔ nhyɛso kɛse-da so ara di gyinabea a ɛho hia. Wɔnam free radical mfiri so yɛ polymerized ma ɛbɛyɛ polyethylene a emu duru yɛ kɛse wɔ ɔhyew a ɛkɔ soro ne nhyɛso kɛse ase, a ɛwɔ su ahorow a edidi so yi:
(1) Ethylene polymerization reaction nhyehyɛe no yɛ exothermic adeyɛ a emu yɛ den. Ɔhyew a ɛwɔ polymerization a ɛwɔ ethylene mu no bɛyɛ 93.5kJ/mol (anaasɛ 3.3kJ/g), na ɔhyew pɔtee a ethylene tumi wɔ wɔ 235MPa ne 150 ~ 300℃yɛ 2.51 ~ 2.85J/(g·℃). Sɛ wɔantumi nyi ɔhyew a ɛma nneɛma yɛ adwuma no mfi hɔ wɔ bere mu a, bere biara Polymerization of 1% ethylene bɛma ɔhyew no akɔ soro digrii 12 kosi 13 . Sɛ ɔhyew no kɔ soro dodo a, ɛbɛma ethylene nso aporɔw.
(2) Wɔ nhyɛso kɛse ase no, wɔahyɛ ethylene ma ayɛ nea mframa ntumi nkɔ mu a ne kɛse yɛ 0.5g/mL, a ɛte sɛ nsu a wontumi nhyɛ no. Saa bere yi de, kwan a ɛda ethylene molecule ahorow ntam no so tew kɛse, na ɛnam so ma free radicals ne ethylene molecules no kɔ soro. Nneɛma a ebetumi aba sɛ ɛbɛbɔ no yɛ kɛse, enti polymerization reaction no taa ba.
(3) Free radical dwumadi a ɛwɔ nkɔnsɔnkɔnsɔn a ɛrenyin no mu wɔ ɔhyew a ɛkɔ soro mu no yɛ kɛse, na nkɔnsɔnkɔnsɔn a wɔde kɔ baabi foforo no taa ba, na polymer a wonya no wɔ linear nhyehyɛe a nkɔnsɔnkɔnsɔn a ɛwɔ nkorabata pii wom. Mpɛn pii no, carbon nkɔnsɔnkɔnsɔn atom 1000 biara wɔ nkorabata 20-30, crystallinity yɛ 45%-65%, density yɛ 0.910-0.925g/mL, emu duru yɛ hare, ɛyɛ mmerɛw, ɛyɛ mmerɛw, ɔhyew a ɛba fam a ɛko tia ne impact resistance.