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Classification of cellulose ethers


Classification of cellulose ethers

There are many varieties of cellulose ethers, and they are still increasing. There are nearly a thousand varieties of cellulose ethers, which can be classified according to five different methods, namely:

①According to the viscosity of the standard aqueous solution

②According to the type of substituent

③According to the degree of substitution

④According to the physical structure (ionization)

⑤According to the solubility

According to the types of substituents, cellulose ethers can be divided into single ethers and mixed ethers. There is only one type of substituent in a single ether. In the mixed ether, the cellulose ether molecular chain can have two or more substituents. Examples of main varieties are as follows:

1. Single ethers:

Methyl Cellulose (MC)

Ethyl cellulose (EC)

Hydroxyethyl cellulose (HEC)

Hydroxypropyl cellulose (HPC)

Carboxymethyl cellulose (CMC)

Polyanionic cellulose (PAC)

Cyanoethyl Cellulose (CEC)

2.Mixed ethers:

Hydroxypropyl methylcellulose (HPMC)

Methyl Hydroxyethyl Cellulose (MCEC)

Hydroxyethyl methyl cellulose (HEMC)

Carboxymethyl Hydroxyethyl Cellulose (CMHEC)

Carboxymethyl Hydroxypropyl Cellulose (CMHPC)

Carboxymethyl methyl cellulose (CMMC)

Carboxymethyl ethyl cellulose (CMEC)

Hydroxybutyl methyl cellulose (HBMC)

Ethyl Hydroxyethyl Cellulose (EHEC)

Ethyl Methyl Cellulose (EMC)

3.According to ionization:

Ionic ether, such as CMC, PAC

②Non-release ether, such as HPMC, MC, HPC, HEC

③Ionic and non-ionic mixed ethers, such as CMHEC, CMHPC, CMMC, CMEC

4. Divided into dissolution performance:

Water-soluble fiber ether, HPMC, PAC, HEC, MC, HEMC, HPC, CMC

②Organic soluble cellulose ether, such as EC, CEC

CMC NA pac pac hv