Cov khoom lag luam polyethylene glycol series tsis yog - tshuaj lom thiab tsis yog - khaus, muaj dej solubility zoo, thiab muaj kev sib raug zoo nrog ntau yam organic. Lawv muaj cov khoom zoo lubricating, moisturizing zog, dispersing zog, adhesives, antistatic agents, thiab softening agents, thiab lwm yam. Lawv yog dav siv nyob rau hauv kev lag luam xws li tshuaj pleev ib ce, tshuaj, tshuaj fibers, roj hmab, plastics, papermaking, xim, electroplating, tshuaj tua kab, hlau ua, thiab zaub mov ua.
Specification
|
Yam khoom |
PEB 4000 |
Txuj |
|
Qhov tshwm sim |
Dawb khoom |
/ |
|
OH nqi, mgKOH/g |
25-28 |
GB/T 7383-2007 |
|
Cov dej noo, (%) |
<=0.5 |
GB/T 11275-2007 |
|
pH |
5.0-7.0 |
GB/T 6368-2008 |
|
Chroma (AHPH) |
<=50 |
GB/T 9282.1-2008S50 |
Cov khoom ntawm polyethylene glycol
Ib qho polymer tsim los ntawm cov tshuaj tiv thaiv ntxiv ntawm polyethylene thiab dej. Cov uas muaj lub cev hnyav dua 700 yog tsis muaj xim, tsis muaj ntxhiab, tsis yog - cov kua dej tsis muaj zog ntawm 20 degree, me ntsis hygroscopic. Cov uas muaj qhov hnyav molecular ntawm 700 thiab 900 yog ib nrab- khoom. Cov uas muaj qhov hnyav molecular ntawm 1000 lossis siab dua yog daj ntseg dawb waxy khib nyiab lossis flocculent paraffin lossis cov hmoov ntws. Nws yog miscible nrog dej thiab soluble nyob rau hauv ntau cov organic solvents xws li cawv, ketones, glycerides, thiab aromatic hydrocarbons; Nws yog insoluble nyob rau hauv feem ntau aliphatic hydrocarbons. Raws li qhov hnyav molecular nce, nws cov dej solubility, vapor siab, hygroscopicity, thiab solubility hauv cov kuab tshuaj organic tag nrho txo qis raws li, thaum lub sijhawm khov, qhov txheeb ze ntom ntom, flash point, thiab viscosity nce raws li. Nws yog kub ruaj khov, tsis hnov mob nrog ntau cov tshuaj, thiab tsis hydrolyze.
Cov ntawv thov hauv Molecular Biology
PEG tuaj yeem ua rau muaj kev sib sau ntawm macromolecules hauv cov tshuaj aqueous. Nws muaj ntau daim ntawv thov hauv molecular cloning, suav nrog: 1. Precipitating DNA los ntawm qhov loj me; 2. Precipitating thiab purifying phage hais; 3. Thaum lub sij hawm hybridization, DNA molecular blunt- kawg ligation, thiab DNA lub davhlau ya nyob twg daim ntawv lo siv T4 polynucleotide kinase, nws ua rau kom muaj kev ruaj ntseg ntawm cov khoom sib txuas ntawm nucleic acid chains . 4. Fusion ntawm cov hlwb los yog cov kab mob protoplasts.
Cim npe nrov: Peg 4000 industrial qib, Tuam Tshoj peg 4000 industrial qib manufacturers, lwm tus neeg, Hoobkas
