Video: Puas yog PVC yog ib qho kev sib txuas ntawm polymer?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Polymer ; PVC ; Kev sib txuas; Grafting; FT-IR; Thermal stability. Poly (vinyl chloride) i.e. PVC yog ib qho ntawm cov khoom siv ntau yam polymers & dav siv thermoplastic vinyl polymer . Nyob rau hauv cov nqe lus ntawm cov nyiaj tau los generated, PVC yog ib qho ntawm cov khoom tseem ceeb tshaj plaws ntawm kev lag luam tshuaj.
Tsis tas li cov lus nug yog, dab tsi yog qhov cross linked polymer?
Hla - txuas yog ib daim ntawv cog lus uas txuas ib qho polymer saw mus rau lwm tus polymer saw hlau. Yog li ntoo khaub lig - txuas polymers yog polymers uas tau thaum ntoo khaub lig - txuas daim ntawv cog lus tsim ntawm monomeric units. Hla - txuas polymers yog insoluble nyob rau hauv tag nrho cov kuab tshuaj vim cov polymer chains yog khi ua ke los ntawm cov khoom muaj zog covalent bonds.
Puas yog Bakelite yog qhov sib txuas ntawm cov polymer? Bakelite yog a ntoo khaub lig - txuas condensation polymer ntawm phenol $$(C_{6}H_{5} - OH)$$ thiab formaldehyde $$(HCHO)$$. Nws yog thermosetting yas siv los ua hluav taws xob keyboards thiab hloov boards.
Qhov sib thooj, dab tsi yog cross linked polymers muab ob qho piv txwv?
Piv txwv ntawm crosslinked polymers Xws li: Polyester fiberglass, polyurethanes siv los ua txheej txheej, nplaum, roj hmab vulcanized, epoxy resins thiab ntau ntxiv.
Dab tsi yog qhov txawv ntawm linear polymer thiab cross-linked polymer?
Tus yuam sij qhov sib txawv ntawm tus ntoo khaub lig - txuas polymer thiab cov linear polymer yog hais tias cov monomer units ntawm linear polymers muaj qhov kawg-rau-kawg txuas, zoo li cov hlaws dai hauv caj dab, whereas ntoo khaub lig - txuas polymers yog ua los ntawm chains uas tau koom ua ke los ntawm ib tug series ntawm covalent bonds, hu ua ntoo khaub lig - txuas.
Pom zoo:
Dab tsi yog ib qho piv txwv ntawm cov khoom sib txuas ntawm kev sib npaug?
Kev rho tawm (Tsis yog Commutative) Tsis tas li ntawd, kev faib, kev sib xyaw ntawm cov dej num thiab cov lej sib npaug yog ob qho piv txwv zoo uas tsis yog kev sib txuas
Dab tsi yog qhov kev qhia uas sib txuas cov lej sib txawv thiab tsawg kawg ib qho kev ua haujlwm?
Ib qho kev qhia zauv muaj cov lej thiab kev ua haujlwm. Ib qho kev qhia txog algebraic yuav luag zoo ib yam tshwj tsis yog nws kuj muaj qhov sib txawv
Dab tsi yog qhov sib txawv ntawm qhov sib txawv ntawm cov kab sib txuas thiab ntau qhov sib piv?
6. (2 lub cim) Qhov sib txawv ntawm cov kab sib txuas (kev sib piv) thiab ntau qhov sib piv yog dab tsi? Cov kab sib xyaw ua ke yog npaj sib piv; uas yog, tshwj xeeb txhais tau tias yog ua ke nyob rau hauv ntau txoj kev thiab contrasted nrog rau lwm yam kev sib txuas ntawm txhais tau tias
Puas yog nws ua tau rau ib qho kev sib npaug ntawm ob txoj kab sib npaug kom tsis muaj kev daws teeb meem piav qhia koj qhov laj thawj?
Cov kab ke ntawm kab sib npaug tuaj yeem tsuas muaj 0, 1, lossis ib qho kev daws teeb meem tsis kawg. Ob kab no tsis tuaj yeem hla ob zaug. Cov lus teb raug yog tias qhov system muaj ib qho kev daws teeb meem. Total Number of Points Number of 2-Point Baskets Number of 3-Point Baskets 17 4 (8 ntsiab lus) 3 (9 points) 17 1 (2 points) 5 (15 points)
Dab tsi yog lub luag haujlwm ntawm ATP hauv kev sib txuas lus sib txuas?
ATP coupling tso cai rau cov tshuaj tiv thaiv uas xav tau lub zog tshwm sim los ntawm kev siv lub zog tso tawm hauv kev hloov pauv ntawm ATP mus rau ADP kom lub zog tas li ntawm cov tshuaj tiv thaiv