Fluoropolymer Monomer Synthesis: Tetrafluoroethylene;Hexafluoropropylene;Perfluoroalkyl Vinyl Ethers;Chlorotrifluoroethylene;Vinylidene Fluoride;Vinyl Fluoride.
Thepa ea Tetrafluoroethylene
Tetrafluoroethylene ke khase e se nang 'mala, e se nang monko, e sa latsoeheng, e seng chefo e belang ho 76.3 C 'me e qhibiliha ho 142.5 C. Thempereichara ea bohlokoa le khatello ea TFE ke 33.3 C le 3.92 MPa.TFE e bolokoa e le mokelikeli;khatello ea mouoane ho 20 C ke 1 MPa.Mocheso oa eona oa sebopeho o tlalehoa e le 151.9 kcal / mole.Polymerization ea TFE e exothermic haholo 'me e hlahisa 41.12 kcal / mole e futhumatsang tekanyo ea eona e ka bapisoang le mocheso oa polymerization ea vinyl chloride le styrene, ho 23-26 kcal / mole le 16.7 kcal / mole, ka ho latellana.
Poloko e bolokehileng ea TFE e hloka hore oksijene ea eona e be tlase ho 20 ppm.Mocheso le khatello li lokela ho laoloa nakong ea polokelo ea eona.Ho eketsa mocheso, haholo-holo ka likhatello tse phahameng, ho ka qala ho senyeha ha moea o le sieo (TFE e senya carbon tetrafluoride).Ka pel'a moea kapa oksijene, TFE e etsa metsoako e phatlohang karolong ea molar ea 14-43%.Ho phatloha ha motsoako oa TFE le oksijene ho ka eketsa khatello e kholo ho makhetlo a 100 khatello ea pele.
Thepa ea Hexafluoropropylene
Hexafluoropropylene ke khase e se nang 'mala, e sa nkheng, e sa latsoeheng, ebile e batla e le tlaase, e belang ka 29.4 C 'me e hoama ho 156.2 C. Ka ho pepeseha ha lihora tse 4, mahloriso a 3000 ppm a lumellana le LC50 ka likhoto.Mocheso o matla le khatello ea HFP ke 85 C le 3254 MPa.Ho fapana le TFE, HFP e tsitsitse haholo mabapi le autopolymerization mme e ka bolokoa e le mokelikeli ntle le ho eketsoa ha telogen.HFP e tsitsitse ka mocheso ho fihla ho 400e500 C. Hoo e ka bang 600 C tlas'a vacuum, e senyeha ebe e hlahisa octafluoro-2-butene (CF3CF¼CFCF3) le octa-fluoroisobutylene.
Thepa ea Perfluoroalkyl Vinyl Ethers
Perfluoroalkyl vinyl ethers (PAVE) e theha sehlopha sa bohlokoa sa li-monomers ka hore ke li-comonomers tsa khetho bakeng sa "phetoho" ea thepa ea homofluoropolymers ho phaella ts'ebelisong e pharaletseng ea sebopeho sa li-copolymers tsa TFE.Monyetla oa li-PAVE joalo ka li-modifiers holim'a HFP ke botsitso ba tsona bo makatsang ba mocheso.Mohlala oa bohlokoa khoebong ke per-fluoropropyl vinyl ether (PPVE).PPVE ke mokelikeli o se nang monko, o se nang 'mala mocheso oa kamore.E chesa haholo 'me e tuka ka lelakabe le se nang 'mala.Ha e na chefo e nyane ho feta HFP.
Lintho tsa Chlorotrifluoroethylene
Chlorotrifluoroethylene ke khase e se nang 'mala mocheso oa kamore le khatello.E na le chefo e lekaneng ka LC50 (rat) nakong ea ho pepeseha ha lihora tse 4 le mahloriso a 4000 ppm.E na le mocheso o boima le khatello ea 105.8 C le 4.03 MPa.Oksijene le mokelikeli CTFE li sebetsa 'me li etsa peroxides ka mocheso o tlase haholo.Lihlahisoa tse 'maloa tse nang le oksijene, joalo ka chlorodifluoroacetylfluoride, li hlahisoa ke oxidation ea CTFE.Karabelo e tšoanang e ka etsahala ka mokhoa oa photochemically karolong ea mouoane.Chlorotrifluoroethylene oxide ke sehlahisoa sa karabelo ena.Li-peroxide li sebetsa e le li-initiators tsa polymerization ea CTFE, e ka hlahang ka mabifi.
Thepa ea Vinylidene Fluoride
Vinylidene fluoride, (CH2¼CF2), [49] e ka cha 'me ke khase e mocheso oa kamore.Ha e na 'mala ebile ha e na monko 'me e pheha ho 84 C. VDF e ka etsa metsoako e phatlohang ka moea.Polymerization ea khase ena ke exothermic haholo 'me e etsahala ka holim'a mocheso oa eona o boima le khatello.
Thepa ea Vinyl Fluoride
Vinyl fluoride (75-02-5) (fluoroethene) ke khase e se nang 'mala maemong a tikoloho.E chesa moeeng pakeng tsa meeli ea 2,6 le 22% ka molumo.Mocheso o fokolang oa mocheso bakeng sa VF le metsoako ea moea ke 400 C. Ho eketsa palo ea trace (<0.2%) ea terpenes ho sebetsa hantle ho thibela polymerization e ikemetseng ea VF.VF e thibetsoeng e khethiloe e le khase e tukang ke Lefapha la Lipalangoang la United States.
Nako ea poso: May-10-2018