Kūʻē ʻo PVDF i ka hapa nui o nā kemika kūlohelohe a me nā mea hoʻoheheʻe chlorinated.ʻO ka poli (vinyl fluoride) he polymer semirystalline me kahi hoʻolālā, zigzag conformation.Hiki ke ʻano like ʻole ka degere o ka crystallinity mai 20 a 60% a he hana ia o nā hale kīnā.
,
Nā Waiwai PVDF
ʻO ka polyvinylidene fluoride he polymer semirystalline (35e70% crystallinity) me kahi kaulahao zigzag lōʻihi. ʻO ka hoʻohui ʻana o ke poʻo-i-tail o VDF ka mea nui akā aia nā poʻo-poʻo a i ʻole huelo-i-huʻu kīnā e pili ana i ka crystallinity a me nā waiwai o PVDF.
He nui nā hoʻololi a PVDF a hoʻololi kona density no kēlā me kēia mokuʻāina polymorph.ʻEhā mau mokuʻāina i manaʻo ʻia, i kapa ʻia ʻo a, b, g, a me d.ʻO ka māhele maʻamau he a-PVDF e hōʻike ana i nā hoʻololi ma 70 C (g), 38 C (b), 50 C (a"), a me 100 C (a').
Kūʻē ʻo PVDF i ka hapa nui o nā kemika kūlohelohe a me nā mea hoʻoheheʻe chlorinated.ʻO nā kumu ikaika, nā amine, nā esters, a me nā ketones e hoʻouka i kēia resin.ʻO ka hopena mai ka pehuʻana a hiki i ka hoʻopau pihaʻana i loko o kēia mau mea hoʻoheheʻe ma muli o nā kūlana.Hōʻike ka PVDF i ka hoʻohālikelike me kekahi mau polymers.Ua hoʻomohala ʻia ka hui ʻana me ka acrylic a me ka methacrylics.
ʻO PVDF, e like me ETFE, hiki ke hoʻololi i nā loulou ma muli o ka ʻike ʻana i ka radiation.He hopena haʻahaʻa ka hoʻoheheʻe ʻana (gamma rays) i nā waiwai mechanical o PVDF.
Na Waiwai PVF
ʻO ka poli (vinyl fluoride) he polymer semirystalline me kahi hoʻolālā, zigzag conformation.Hiki ke ʻano like ʻole ka degere o ka crystallinity mai 20 a 60% a he hana ia o nā hale kīnā.ʻO ka PVF pāʻoihana he atactic, aia ma kahi o 12% mau loulou poʻo-a-poʻo, a hōʻike i kahi kiʻekiʻe heheʻe ma kahi o 190 C.
Hōʻike ka PVF i kekahi mau hoʻololi ma lalo o ka wela hoʻoheheʻe.Loaʻa ka Tg haʻahaʻa ma 15 a 20 C a ʻo Tg luna ma ka laulā 40e50 C.ʻElua mau hoʻololi ʻē aʻe ma 80 C a me 150 C i hōʻike ʻia.
He haʻahaʻa ko PVF i loko o nā mea hoʻoheheʻe a pau ma lalo o 100 C. Ua hoʻomākaukau ʻia nā Polymers me ka solubility nui me ka hoʻohana ʻana i ka 0.1% 2-propanol polymerization modifier a ua ʻike ʻia i loko o ka solution N,N-dimethylformamide i loaʻa ka 0.1 N LiBr.Mn mai 76,000 a 234,000 (osmometry), a me Ms mai 143,000 a 654,000 (sedimentation velocity).
Ua hōʻike ʻia ʻo PVF kiʻekiʻe e hoʻohaʻahaʻa i ka lewa inert, me ka nalowale HF a me ka ʻoki iwi kuamoʻo ma kahi o 450 C. Ma ka lewa, hiki ke poho HF ma kahi o 350 C, a ukali ʻia e ka ʻoki iwi kuamoʻo ma kahi o 450 C.
ʻIke ʻia ka PVF i ka radiation i ka UV, ʻike ʻia, a kokoke i ka infrared, e hoʻouna ana i 90% o ka radiation mai 350 a 2500 nm.Hoʻopili ʻia ka PVF ma ka ʻike ʻana i ka radiation electron-beam o 1000 Mrad akā pale i ka haki ʻana ma nā haʻahaʻa haʻahaʻa.Mālama ʻo ia i kona ikaika ma 32 Mrad ʻoiai ua hoʻohaʻahaʻa ʻia ka PTFE ma 0.2 Mrad.
ʻO ka mahana wela o ka PVF kiʻiʻoniʻoni he 390 C. ʻO ka palena o ka oxygen index (LOI) no PVF he 22.6%.Hoʻokumu ʻia ka HF a me ka hui ʻana o nā hydrocarbons aromatic a me aliphatic mai ka hoʻohaʻahaʻa wela o PVF.
Ka manawa hoʻouna: Apr-04-2018