There are several theories and models that can be studied for understanding supply chain sustainability in the field of management. These theories and models provide frameworks and guidelines to promote sustainable practices within supply chains. Some of the key theories and models are:

1. Triple Bottom Line (TBL):
The TBL theory emphasizes the three dimensions of sustainability, namely economic, social, and environmental. It encourages businesses to consider not only financial profits but also the social and environmental impacts of their operations. This theory helps in aligning supply chain practices with sustainability goals.

2. Circular Economy:
The circular economy model promotes the idea of reducing waste and maximizing resource utilization. It aims to create a closed-loop system where products are designed for longevity, materials are recycled, and waste is minimized. By implementing circular economy principles, supply chains can reduce their environmental footprint and enhance sustainability.

3. Life Cycle Assessment (LCA):
LCA is a methodology that evaluates the environmental impacts of a product or service throughout its entire life cycle, from raw material extraction to disposal. By conducting an LCA, supply chains can identify hotspots and implement sustainable practices to minimize environmental impacts and optimize resource consumption.

4. Lean and Green Supply Chain Management:
This model combines lean principles, which focus on eliminating waste and increasing efficiency, with green practices that prioritize environmental sustainability. By integrating lean and green principles, supply chains can reduce costs, improve operational efficiency, and minimize environmental impacts.

5. Supplier Relationship Management (SRM):
SRM focuses on building collaborative and sustainable relationships with suppliers. It involves selecting suppliers based on sustainability criteria, engaging in dialogue to promote sustainable practices, and monitoring supplier performance. SRM helps in creating a sustainable supply chain by ensuring ethical sourcing, reducing risks, and driving innovation.

6. Closed-Loop Supply Chain (CLSC):
The CLSC model emphasizes the collection, recycling, and reuse of products and materials. It includes reverse logistics, where products are returned, refurbished, or recycled. By implementing a closed-loop supply chain, organizations can reduce waste, conserve resources, and create a more sustainable operating model.

Overall, studying these theories and models can provide insights into the various dimensions of supply chain sustainability and help in formulating strategies to promote sustainable practices within supply chains.