Qhov Tseem Ceeb Qhov txawv - Perspex vs Polycarbonate
Engineering thermoplastic polymers xws li polyethylene, polypropylene, polyvinyl chlorides, polycarbonate, polyacrylates yog nrov heev nyob rau hauv lub ntiaj teb no tam sim no vim lawv zoo heev ua ke ntawm lub cev thiab tshuaj zog. Txawm li cas los xij, tsis muaj ib qho ntawm cov plastics no qhia txog kev ua tiav tiav. Perspex thiab polycarbonate yog ob hom amorphous engineering thermoplastics uas muaj cov khoom sib txawv nrog lawv tus kheej qhov zoo thiab qhov tsis zoo. Qhov sib txawv tseem ceeb ntawm Perspex thiab polycarbonate yog Perspex yog tsim los ntawm polymerization ntawm monomers ntawm acrylic tsev neeg, whereas polycarbonate yog tsim los ntawm polycondensation polymerization ntawm phosgene thiab BPA (bisphenol A) los yog yaj transesterification ntawm DPC thiab BPA.
Perspex yog dab tsi?
Perspex® yog lub npe lag luam ntawm cov ntawv acrylic, uas tau pom thawj zaug los ntawm ICI cov kws tshawb fawb hauv xyoo 1934. Perspex® yog tus sau npe Cov cim lag luam ntawm Lucite International, uas yog ua haujlwm raws li Mitsubishi Chemical Corporation. Perspex® acrylic yog thawj cov khoom siv acrylic sau npe nyob rau hauv cov khoom siv hluavtaws hauv daim ntawv ntawm cov ntawv, rods, raj, thiab lwm yam zoo li daim. Cov tsev neeg ntawm acrylate suav nrog cov polymers ntawm cov monomers ntawm acrylonitrile, hydroxyethyl methacrylate, acrylamide, methyl cyanoacrylate, ethyl cyanoacrylate, methyl acrylate, ethyl acrylate, trimethylolpropane triacrylate, thiab methyl methacrylate. Lub polymerization ntawm methyl methacrylate rau hauv polymethyl methacrylate (PMMA) yog thawj zaug ntawm acrylate polymers nyob rau hauv 1877 los ntawm German chemists Fittig thiab Paul. Tom qab kev lag luam ntawm cov nplooj ntawv acrylic, lawv tau siv thawj zaug thaum Tsov Rog Ntiaj Teb Zaum II rau cov cua ntsawj ntshab, canopies, thiab phom turrets ntawm dav hlau thiab periscope ports ntawm submarines.
Daim duab 1: Refrction hauv Perspex Block
Perspex® muab qhov zoo tshaj plaws kho qhov muag pom tseeb, tshuaj lom neeg ua haujlwm, kev ua haujlwm zoo thiab ua kom tawv tawv zoo heev uas ua rau cov khoom tsim nyog rau ntau qhov kev siv nrog rau cov lo ntsiab muag kho qhov muag, kev kuaj mob, ntim khoom kom zoo nkauj, thiab automotive rear teeb. Perspex®polymer yog qhov zoo tagnrho rau extrusion thiab txhaj tshuaj molding; Nws tuaj yeem siv los tsim cov khoom siv teeb pom kev zoo xws li LEDs, extruded diffuser panels, profiles, thiab tubing. Thaum piv rau lwm cov khoom siv thermoplastics, acrylate polymers raug nqi vim lawv cov kev sib txuas ntawm lub cev zoo thiab cov khoom siv xws li huab cua tsis kam, siab zog, thiab ci ntsa iab. PMMA muaj qhov hloov pauv iav ntawm 105-107 ° C, thiab qhov ntsuas qhov ntsuas ntawm 1.49, uas yog piv rau cov iav (1.60). Li no, PMMA yog qee zaum hu ua 'organic iav.' Vim nws qhov kev tiv thaiv siab rau cov zaub mov, rog, roj, tsis muaj oxidizing acids, alkalis, ntsev, minerals, thiab aliphatic hydrocarbons, PMMA yog dav siv los ua cov khoom noj khoom haus qib. thiab raws li cov khoom ntim. Txawm li cas los xij, nws tsis tiv taus cov kua qaub uas muaj zog, muaj ntxhiab thiab chlorinated hydrocarbons, ketones, cawv, thiab esters. Qhov kev ruaj ntseg qhov ntev yog qhov zoo, tab sis nws muaj kev cuam tshuam tsawg dua.
YPolycarbonate yog dab tsi?
Polycarbonate yog qhov paub zoo pob tshab thiab amorphous engineering cov khoom siv thermoplastic uas muaj ntau yam zoo heev. Nws yog lub teeb-hnyav thermoplastic tab sis muaj qhov zoo heev toughness, seem stability, thermal kuj thiab optical clarity. Vim nws cov hluav taws xob tsis zoo, polycarbonate tau dav siv los tsim ntau yam khoom siv hluav taws xob thiab hluav taws xob thiab cov khoom siv. Vim nws qhov pom kev pom tseeb, polycarbonate yog siv los ua cov tsom iav qhov muag thiab qee yam kev tshaj tawm digital xws li CDs thiab DVDs. Vim nws cov khoom siv dav dav, polycarbonate tau ua haujlwm nyob rau hauv ntau yam kev siv los ntawm cov khoom siv hauv tsev ib txwm mus rau tsheb thiab aerospace cov cuab yeej thiab cov khoom siv. Tsis tas li ntawd, cov khoom siv thermoplastic no kuj tseem siv los ua cov iav tiv thaiv khawb, cov khoom siv kho mob thiab kev tsim kho, cov ntaub thaiv kev kub ntxhov, cov kaus mom kev nyab xeeb, thiab lub ntsej muag lub ntsej muag. Cov keeb kwm ntawm polycarbonate rov qab mus rau thaum ntxov 1890s raws li A. Einhorn thawj zaug tsim polycarbonate crystals los ntawm reacting resorcinol thiab phosgene hauv pyridine hnyav. Tom qab ntawd, xyoo 1950, cov neeg tsim khoom lag luam uas yog Bayer thiab GE tau tuaj yeem ua lag luam cov txheej txheem rau kev tsim cov polycarbonate resin raws li bisphenol A (BPA).
Daim duab 2: Lub raj mis dej ua los ntawm Polycarbonate
Tam sim no, ob txoj hauv kev tau siv los tsim cov khoom siv polycarbonate. Thawj txoj kev yog ob-theem interfacial polycondensation polymerization ntawm phosgene thiab BPA, thiab txoj kev thib ob yog yaj transesterification ntawm DPC thiab BPA ntawm 300 ° C thiab tsis tshua muaj siab. Qhov hnyav molecular ntawm polycarbonate resins txawv ntawm 22,000 txog 35,000 g / g mol. Cov iav hloov pauv kub yog nyob nruab nrab ntawm 145 - 150 ° C. Lub xub ntiag ntawm qhov loj me uas muaj ntxhiab aryl rings nyob rau hauv lub caj qaum ntawm polycarbonate yog vim li cas rau nws cov khoom engineering. Lub melting point ntawm polycarbonate yog nyob ib ncig ntawm 230 ° C. Nws muaj qhov zoo ntawm qhov ruaj khov, nkag siab tsis kam thiab siab cuam tshuam lub zog. Polycarbonate yog suav tias yog ib qho khoom siv inert; Yog li ntawd, nws tau dav siv los ua cov khoom noj khoom haus qib yas. Qhov tsis zoo ntawm polycarbonate muaj xws li UV-tiv taus thiab hydrolysis los ntawm alkali daws xws li potassium hydroxide, sodium hydroxide, thiab lwm yam.
Qhov txawv ntawm Perspex thiab Polycarbonate yog dab tsi?
Perspex vs Polycarbonate |
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| Perspex yog lub npe lag luam ntawm Lucite International rau cov ntawv acrylic. | Polycarbonate yog ib lub npe nrov (tsis yog lub npe lag luam). |
| Perspex yog tsim los ntawm polymerization ntawm acrylic monomers lossis lawv cov copolymer. | Polycarbonate yog tsim los ntawm interfacial polycondensation polymerization ntawm phosgene thiab BPA los yog yaj transesterification ntawm DPC thiab BPA ntawm 300 ° C thiab tsis tshua muaj siab. |
| Clarity siab heev, yuav luag sib npaug iav. | Clarity tsawg piv rau Perspex. |
| iav hloov pauv kub | |
| 105- 107 °C | 145 - 150 °C |
| Huab cua Resistance | |
| Huab cua tiv taus siab heev. | Qhov no muaj qhov tiv thaiv UV qis. |
| Daim ntawv thov | |
| Perspex yog siv rau hauv cov lo ntsiab muag kho qhov muag, tshuaj ntsuam xyuas kev kho mob, ntim cov tshuaj pleev ib ce, lub teeb tsheb tom qab, lub tshuab cua, thiab lwm yam. | Polycarbonate yog siv rau hauv khawb resistant glazing, kev kho mob thiab kev tsim kho, cov ntaub thaiv npog kev kub ntxhov, kaus mom hlau tiv thaiv, thiab lwm yam. |
Summary – Perspex vs Polycarbonate
Perspex yog lub npe lag luam rau cov ntawv acrylic, uas yog tsim los ntawm polymerization ntawm acrylic monomers thiab lawv cov copolymers. Nws tau siv dav hauv kev lag luam kev kho mob, kev tsim cov lo ntsiab muag, kev lag luam tsheb thiab ntim khoom vim nws cov tshuaj lom neeg zoo thiab huab cua tsis kam thiab pob tshab zoo. Polycarbonate yog lub npe nrov rau kev lag luam yas tsim los ntawm bisphenol A thiab muaj ntau yam kev thov los ntawm cov khoom siv hauv tsev mus rau aerospace thiab kev lag luam tsheb. Polycarbonate yog paub zoo rau nws zoo heev rigidity, tsis tshua muaj hnyav, clarity thiab hluav taws xob rwb thaiv tsev zog. Qhov no yog qhov txawv ntawm perspex thiab polycarbonate.
Download PDF Version of Perspex vs Polycarbonate
Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline lub hom phiaj raws li daim ntawv ceeb toom. Thov rub tawm PDF version ntawm no Qhov txawv Ntawm Perspex thiab Polycarbonate
