*Review* **Waste Natural Polymers as Potential Fillers for Biodegradable Latex-Based Composites: A Review**

**D. N. Syuhada and A. R. Azura \***

School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal 14300, Penang, Malaysia; nsyuhadadzulkafly@gmail.com

**\*** Correspondence: srazura@usm.my; Tel.: +60-45996111

**Abstract:** In recent years, biodegradable composites have become important in various fields because of the increasing awareness of the global environment. Waste natural polymers have received much attention as renewable, biodegradable, non-toxic and low-cost filler in polymer composites. In order to exploit the high potential for residual natural loading in latex composites, different types of surface modification techniques have been applied. This review discusses the preparation and characterization of the modified waste natural fillers for latex-based composites. The potency of the waste natural filler for the latex-based composites was explored with a focus on the mechanical, thermal, biodegradability and filler–latex interaction. This review also offers an update on the possible application of the waste natural filler towards the biodegradability of the latex-based composites for a more sustainable future.

**Keywords:** extractions; cellulose; crosslink mechanism; biodegradable; waste materials; natural filler; latex; composite; mechanical properties; surface modifications
