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Cellulose molecular structure (partial) | Source: Wikipedia
Each cellulose molecule is a long-chain polymer made of hundreds of glucose units connected hand in hand. The glucose unit in cellulose likes to make friends around and form hydrogen bonds with other glucose units.
Each long cellulose molecule contains crystalline regions (crystalline region) and amorphous regions (amorphous region). Although the crystalline regions of cellulose are tightly arranged, which limits their freedom of movement, the non-crystalline regions between cellulose are loosely combined and hydrogen bonds are easily broken.