Is PTFE Tubing Flexible?| BESTEFLON

Polytetrafluoroethylene (polytetrafluoroethylene) mwina ndi fluoropolymer yomwe imagwiritsidwa ntchito kwambiri chifukwa ili ndi makhalidwe angapo omwe amaipangitsa kukhala chinthu choyenera kugwiritsidwa ntchito m'njira zosiyanasiyana. Ndi yosinthasintha kuposa mapaipi ena ofanana ndipo imatha kupirira pafupifupi mankhwala onse amafakitale.

Kutentha kwake kuli pafupifupi -330°F mpaka 500°F, zomwe zimapangitsa kutentha kwake kukhala kwakukulu kwambiri pakati pa ma fluoropolymers. Kuphatikiza apo, ili ndi mphamvu zamagetsi zabwino komanso mphamvu zochepa zamaginito. Machubu a Ptfe ndi machubu ogwiritsidwa ntchito kwambiri m'ma laboratories komanso momwe amagwiritsidwira ntchito pomwe kukana mankhwala ndi kuyera ndikofunikira.PTFEili ndi coefficient yotsika kwambiri ya kukangana ndipo ndi imodzi mwa zinthu "zotsetsereka" zodziwika kwambiri

Mawonekedwe:

Utomoni wa PTFE woyera 100%

Poyerekeza ndi mapaipi a FEP, PFA, HP PFA, UHP PFA, ETFE, ECTFE, omwe ndi osinthasintha kwambiri a fluoropolymer.

Sizimatha kugwiritsa ntchito mankhwala, sizimalimbana ndi mankhwala ndi zosungunulira zonse zamafakitale

Kutentha kwakukulu

Kulowa kochepa

Mapeto osalala osamata

Chokwanira chotsika kwambiri cha kukangana

Magwiridwe antchito abwino kwambiri amagetsi

Chosayaka moto

Si poizoni

Mapulogalamu:

labotale

Njira ya mankhwala

Kusanthula ndi zida zogwirira ntchito

Kuwunika mpweya woipa

Kutentha kochepa

kutentha kwambiri

Magetsi

ozoni

Kapangidwe ka mamolekyu a PTFE

Polytetrafluoroethylene (PTFE) imapangidwa ndi polymerization ya mamolekyu ambiri a tetrafluoroethylene

Chithunzi chosavuta ichi cha PTFE sichikuwonetsa kapangidwe ka molekyulu ya magawo atatu. Mu poly(ethylene) yosavuta ya molekyulu, msana wa kaboni wa molekyulu umalumikizidwa ndi maatomu a haidrojeni okha, ndipo unyolo uwu ndi wosinthasintha kwambiri - si molekyulu yolunjika.

Komabe, mu polytetrafluoroethylene, atomu ya fluorine mu gulu la CF2 ndi yayikulu mokwanira kusokoneza atomu ya fluorine pa gulu lapafupi. Muyenera kukumbukira kuti atomu iliyonse ya fluorine ili ndi ma elekitironi atatu omwe amatuluka.

Zotsatira zake ndikuletsa kuzungulira kwa chomangira chimodzi cha kaboni ndi kaboni. Maatomu a fluorine nthawi zambiri amakhala okonzedwa kuti akhale kutali kwambiri ndi maatomu a fluorine oyandikana nawo. Kuzungulira nthawi zambiri kumaphatikizapo kugundana kwa maatomu a fluorine pa maatomu a kaboni oyandikana nawo - zomwe zimapangitsa kuti kuzungulirako kusakhale koyenera.

Mphamvu yonyansa imatseka molekyuluyo kukhala ngati ndodo, ndipo maatomu a fluorine amakonzedwa mozungulira pang'ono kwambiri—maatomu a fluorine amakonzedwa mozungulira mozungulira msana wa kaboni. Zingwe za lead izi zidzakanikizidwa pamodzi ngati mapensulo aatali, owonda m'bokosi.

Kugwirizana kumeneku kumakhudza kwambiri mphamvu zapakati pa mamolekyu, monga momwe mudzaonera.

Mphamvu zapakati pa mamolekyulu ndi malo osungunuka a PTFE

Kutentha kwa polytetrafluoroethylene kumatchedwa 327°C. Izi ndi zapamwamba kwambiri pa polima iyi, kotero payenera kukhala mphamvu zambiri za van der Waals pakati pa mamolekyulu.

Nchifukwa chiyani anthu amanena kuti mphamvu za van der Waals mu PTFE ndi zofooka?

Mphamvu yogawa ya van der Waals imayamba chifukwa cha ma dipole osinthasintha kwakanthawi omwe amapangidwa pamene ma elekitironi mu molekyulu akuyenda mozungulira. Chifukwa molekyulu ya PTFE ndi yayikulu, mungayembekezere mphamvu yayikulu yogawa chifukwa pali ma elekitironi ambiri omwe amatha kuyenda.

Mkhalidwe wamba ndi wakuti molekyulu ikakhala yayikulu, mphamvu yofalikira imakulanso

Komabe, PTFE ili ndi vuto. Fluorine ndi yoipa kwambiri. Imakonda kumangirira ma elekitironi omwe ali mu chomangira cha carbon-fluorine pamodzi mwamphamvu, kotero kuti ma elekitironiwo sangasunthe monga momwe mukuganizira. Timafotokoza kuti chomangira cha carbon-fluorine sichili ndi polarization yamphamvu.

Mphamvu za Van der Waals zimaphatikizaponso kuyanjana kwa dipole-dipole. Koma mu polytetrafluoroethylene (PTFE), molekyulu iliyonse imazunguliridwa ndi gawo la maatomu a fluorine omwe ali ndi mphamvu zochepa. Pankhaniyi, kuyanjana kokhako komwe kungatheke pakati pa mamolekyu ndi kukana kogwirizana!

Chifukwa chake mphamvu yogawanitsa ndi yofooka kuposa momwe mukuganizira, ndipo kuyanjana kwa dipole-dipole kungayambitse kukwiya. Nzosadabwitsa kuti anthu amanena kuti mphamvu ya van der Waals mu PTFE ndi yofooka kwambiri. Simudzapeza mphamvu yokwiya, chifukwa mphamvu ya kugawanitsa ndi yayikulu kuposa ya kuyanjana kwa dipole-dipole, koma zotsatira zake ndizakuti mphamvu ya van der Waals imayamba kufooka.

Koma PTFE ili ndi malo osungunuka kwambiri, kotero mphamvu yomwe imagwirizira mamolekyu pamodzi iyenera kukhala yamphamvu kwambiri.

Kodi PTFE ingakhale bwanji ndi malo osungunuka kwambiri?

PTFE ndi yopyapyala kwambiri, m'lingaliro ili pali malo akuluakulu, mamolekyu ali mu dongosolo lokhazikika. Kumbukirani, mamolekyu a PTFE amatha kuonedwa ngati ndodo zazitali. Zipilala izi zidzalumikizidwa pamodzi.

Izi zikutanthauza kuti ngakhale molekyulu ya ptfe singapange ma dipole akuluakulu osakhalitsa, ma dipole angagwiritsidwe ntchito bwino kwambiri.

Kotero kodi mphamvu za van der Waals mu PTFE ndi zofooka kapena zamphamvu?

Ndikuganiza kuti nonse mungakhale olondola! Ngati maunyolo a polytetrafluoroethylene (PTFE) akonzedwa mwanjira yoti palibe kulumikizana kwambiri pakati pa maunyolo, mphamvu pakati pawo idzakhala yofooka kwambiri ndipo malo osungunuka adzakhala ochepa kwambiri.

Koma m'dziko lenileni, mamolekyu amakhala pafupi kwambiri. Mphamvu za Van der Waals sizingakhale zamphamvu monga momwe zilili, koma kapangidwe ka PTFE kamatanthauza kuti zimamva bwino kwambiri, zomwe zimapangitsa kuti ma bond apakati pa mamolekyu akhale olimba komanso malo osungunuka kwambiri.

Izi zikusiyana ndi mphamvu zina, monga mphamvu yolumikizirana ya dipole-dipole, yomwe imachepetsedwa ndi nthawi 23 zokha, kapena kawiri mtunda umachepetsedwa ndi nthawi 8.

Chifukwa chake, kulongedza kolimba kwa mamolekyulu ooneka ngati ndodo mu PTFE kumawonjezera mphamvu ya kufalikira

Makhalidwe osamamatira

Ichi ndichifukwa chake madzi ndi mafuta sizimamatira pamwamba pa PTFE, ndipo chifukwa chake mutha kukazinga mazira mu poto wokutidwa ndi PTFE popanda kumamatira ku poto.

Muyenera kuganizira mphamvu zomwe zingakhazikitse mamolekyu ena pamwamba paPTFEZingaphatikizepo mtundu wina wa chomangira cha mankhwala, mphamvu ya van der Waals kapena chomangira cha hydrogen

Kugwirizana kwa mankhwala

Chigwirizano cha kaboni ndi fluorine ndi champhamvu kwambiri, ndipo sizingatheke kuti mamolekyu ena onse afike pa unyolo wa kaboni kuti apangitse kuti pakhale kusintha kulikonse. N'zosatheka kuti chigwirizano cha mankhwala chichitike.

asilikali a van der Waals

Tawona kuti mphamvu ya van der Waals mu PTFE si yamphamvu kwambiri, ndipo imangopangitsa PTFE kukhala ndi malo osungunuka kwambiri, chifukwa mamolekyu ali pafupi kwambiri kotero kuti amatha kukhudzana bwino.

Koma ndi zosiyana ndi mamolekyu ena omwe ali pafupi ndi pamwamba pa PTFE. Mamolekyu ang'onoang'ono (monga mamolekyu amadzi kapena mamolekyu amafuta) amangokhudzana pang'ono ndi pamwamba, ndipo ndi ochepa okha omwe amakopa van der Waals omwe adzapangidwe.

Molekyulu yayikulu (monga puloteni) sidzakhala yofanana ndi ndodo, kotero palibe kulumikizana kokwanira pakati pake ndi pamwamba kuti igonjetse vuto lochepa la PTFE.

Mulimonsemo, mphamvu ya van der Waals pakati pa pamwamba pa PTFE ndi zinthu zozungulira ndi yaying'ono komanso yosagwira ntchito.

Ma hydrogen bond

Mamolekyu a PTFE pamwamba pake amakutidwa ndi maatomu a fluorine. Maatomu a fluorine awa ndi opanda mphamvu kwambiri, kotero onse ali ndi mphamvu yoipa. Fluorine iliyonse ilinso ndi ma elekitironi atatu omwe amawonekera.

Izi ndi zofunikira pakupanga ma hydrogen bond, monga lone pair pa fluorine ndi atomu ya hydrogen m'madzi. Koma izi mwachionekere sizingachitike, apo ayi padzakhala kukopana kwakukulu pakati pa mamolekyu a PTFE ndi mamolekyu amadzi, ndipo madzi adzamamatira ku PTFE.

Chidule

Palibe njira yothandiza yoti mamolekyu ena agwirizane bwino ndi pamwamba pa PTFE, kotero imakhala ndi malo osamatirira.

Kukangana kochepa

Kuchuluka kwa PTFE komwe kumakhudzana ndi kukangana ndi kochepa kwambiri. Izi zikutanthauza kuti ngati muli ndi pamwamba pake pophimbidwa ndi ptfe, zinthu zina zimagwera mosavuta.

Pansipa pali chidule cha zomwe zikuchitika. Izi zikuchokera mu pepala la 1992 lotchedwa "Friction and Wear of Polytetrafluoroethylene".

Poyamba kutsetsereka, pamwamba pa PTFE pamasweka ndipo unyinji umasamutsidwira kulikonse komwe ukutsetsereka. Izi zikutanthauza kuti pamwamba pa PTFE padzawonongeka.

Pamene kutsetsereka kunapitirira, mabulokowo anatseguka kukhala mafilimu opyapyala.

Nthawi yomweyo, pamwamba pa PTFE pamakokedwa kuti pakhale gawo lokonzedwa bwino.

Malo onse awiri omwe akukumana tsopano ali ndi mamolekyu a PTFE okonzedwa bwino omwe amatha kutsetsereka wina ndi mnzake

Zomwe zili pamwambapa ndi kuyambitsa polytetrafluoroethylene, polytetrafluoroethylene ikhoza kupangidwa kukhala zinthu zosiyanasiyana, ndife akatswiri popanga chubu cha ptfe,opanga payipi ya ptfe, Takulandirani kuti mulankhule nafe