Depolymerization of cellulose is often used as a (pre)treatment protocol within the catalytic valorization strategies of cellulose. Typical depolymerization protocols yield polymerization degrees above 70 anhydroglucose units (AGU). However, shorter cellulose fibers are of interest in the search for accessible dietary fiber additives or renewable materials with distinct mechanical properties (bio-composites). In this work, short-polymer microcrystalline celluloses (SMCC) with an average polymerization degree between 29 and 70 AGU were produced with material yields of 95 % and above by combining a planetary ball mill pretreatment with mild acid hydrolysis. By first decreasing the levelling–off degree of polymerization (LODP) with an intensive ball mill treatment, a mild acid hydrolysis protocol was sufficient to ensure high yields of SMCC. Furthermore, the desired polymerization degree could be obtained by tuning the process parameters.

纤维素的解聚通常用作纤维素催化增值策略中的（预处理）处理方案。典型的解聚方案产生高于 70 个脱水葡萄糖单位 (AGU) 的聚合度。然而，较短的纤维素纤维在寻找可获取的膳食纤维添加剂或具有不同机械性能的可再生材料（生物复合材料）方面很有意义。在这项工作中，通过将行星球磨机预处理与弱酸水解相结合，生产出平均聚合度在 29 到 70 AGU 之间的短聚合物微晶纤维素 (SMCC)，材料收率达到 95% 及以上。通过首先通过强化球磨机处理降低平均聚合度 (LODP)，温和的酸水解方案足以确保 SMCC 的高产率。