:Cellulose diacetate

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Cellulose diacetate, sometimes called diacetate, is a synthetic polymer made by treating cellulose with acetic acid. It consists of two acetyl functional groups on each unit of D-anhydroglucopyranose of the cellulose molecule. It was first developed in the United States.

It is fragile since it is based on cellulose. When cellulose diacetate deteriorates, it shrinks and releases acetic acid causing vinegar syndrome.

Cellulose diacetate has been used to make fabrics, membranes, filaments, and many consumer products. From 1922 to 1957 it was used to make film stock, mainly in smaller formats such as 8 mm, 16 mm, 35 mm, and 70 mm. It has also been used in seed coating applications.Friuli, M., Nitti, P., Cafuero, L. et al. Cellulose Acetate and Cardanol Based Seed Coating for Intraspecific Weeding Coupled with Natural Herbicide Spraying. J Polym Environ (2020). https://doi.org/10.1007/s10924-020-01821-9

In photography, a film substrate made from cellulose diacetate is called safety film.

Cellulose diacetate is hydrophilic{{Cite journal |last1=Qi |first1=Juan |last2=Chen |first2=Yuan |last3=Zhang |first3=Wen-Tao |last4=Li |first4=Lei |last5=Huang |first5=Hua-Dong |last6=Lin |first6=Hao |last7=Zhong |first7=Gan-Ji |last8=Li |first8=Zhong-Ming |date=2022-06-15 |title=Imparting Cellulose Acetate Films with Hydrophobicity, High Transparency, and Self-Cleaning Function by Constructing a Slippery Liquid-Infused Porous Surface |url=https://pubs.acs.org/doi/10.1021/acs.iecr.2c00776 |journal=Industrial & Engineering Chemistry Research |language=en |volume=61 |issue=23 |pages=7962–7970 |doi=10.1021/acs.iecr.2c00776 |issn=0888-5885|url-access=subscription }} and biodegradable.{{Cite journal |last1=Mazzotta |first1=Michael G. |last2=Reddy |first2=Christopher M. |last3=Ward |first3=Collin P. |date=2022-01-11 |title=Rapid Degradation of Cellulose Diacetate by Marine Microbes |url=https://pubs.acs.org/doi/10.1021/acs.estlett.1c00843 |journal=Environmental Science & Technology Letters |language=en |volume=9 |issue=1 |pages=37–41 |doi=10.1021/acs.estlett.1c00843 |bibcode=2022EnSTL...9...37M |issn=2328-8930|hdl=1912/28020 |hdl-access=free }}