Conformational Preorganization: Self-Destructive Plastics & The Next Phase in Sustainable Materials Development

WRITTEN BY ILIANA SLEVKOFF

ILLUSTRATED BY JAMIE YAN

May 13, 2026 | Research | 5 min read

Abstract:

From the nylon in your clothes to the screen of your smartphone, synthetic polymers don’t just exist in daily life—they are daily life. Conventional degradable polymers require harsh mechanical and chemical processing to break down, and often lack life-span control. Natural polymers, such as RNA, DNA, and cellulose, contain built-in structural features that allow them to “self-destruct” at specific times, allowing them to break down and prevent long-term pollution.¹

According to the National Institute of Health, there is currently an estimated 4900 metric tonnes worth of synthetic plastics in landfills that not only cause excess long-term pollution, but also cause dangerous cancer-causing chemicals, such as bisphenol A or BPA, to leech into the environment.² These negatively impact local ecosystems and even humans through things like water pollution and endocrine disruption caused by chemicals from untreated synthetic plastic waste.³ This proves the long-term degradation of synthetic polymers to be one of the biggest challenges in the development of sustainable materials. The building blocks in said materials come from small, simple organic compounds called monomers, with polyfunctionality, or the capacity to form chemical bonds with at least two other monomers, being a key characteristic in the formation of polymers.⁴ Polymers, a class of macromolecules formed from long chains of monomers linked together by covalent bonds, are found both naturally and synthetically.⁵ Imagine a string of beads: each bead is a monomer, and the entire string is a polymer. Natural polymers, including DNA, silk, and latex, degrade naturally over time through biodegradation and self-immolative fragmentation.⁶ While many solutions have been proposed, such as recycling and upcycling, there is currently no conventional way to stimulate the degradation of synthetic polymers without producing excess waste and/or microplastics.

Drawing inspiration from the natural self-destruction mechanisms of biomacromolecules, Rutgers scientists wondered if they could use the conformational preorganization of neighboring polymer groups to modulate and expedite the self-destruction of synthetic polymers, like plastic, without altering the polymer’s chemical identity. By aligning specific molecules, such as nucleophilic groups, close to easily broken labile bonds they successfully mimicked the natural self-destruction of natural polymers that requires minimal energy to initiate.⁷

Introduction:

Inspired by these biological mechanisms, Yuwei Gu, et al proposed that the spatial arrangement of functional groups can be engineered to bias polymer chains toward geometries that experience self-cleavage in mild conditions, essentially creating plastics with programmed life-spans.

Conformational preorganization, or the deliberate spatial alignment of neighboring chemical groups, can be manipulated to program polymer lifespans by shifting the conformational ensemble toward geometries that favor intramolecular cleavage, such as linear, planar, and low-index crystals with weakly bonded planes. This emphasizes 3D molecular topology as a determinant of reactivity, as opposed to conventional makeups that focus primarily on chemical bonds between monomers.

The development of sustainable synthetic polymers could lead to the creation of plastics with lifespans that fit their purpose. For example, polymers used in machinery could be designed to have a lifespan of decades, while polymers used for food packaging could be programmed to begin degrading at the product’s expiration date. Potential use could even go as far as the timed delivery of medication coatings. With scientist Yu Wei Gu, who came up with the initial inspiration for the project, stating:

“This research not only opens the door to more environmentally responsible plastics but also broadens the toolbox for designing smart, responsive polymer-based materials across many fields.” – Yu Wei Gu.

Materials and Methods:

Developing sustainable polymer materials requires strategies that enable not only backbone cleavage but also precise regulation of deconstruction rates to match defined service lifetimes. Conventional approaches achieve degradability by incorporating labile bonds, metal-ion bonds that break easily and rapidly, such as esters, acetals, and phosphates, into polymer backbones.⁹ However, these bonds are often intentionally selected to preserve material performance, requiring harsh chemical or environmental conditions to promote cleavage. As a result, manipulating the degradation kinetics to be precise is difficult. Existing designs typically favor either long-term stability or rapid deconstruction, but rarely both. In contrast, biological macromolecules employ conformationally preorganized intramolecular interactions to enable rapid and highly controlled self-deconstruction when placed under mild, non-enzymatic conditions. For example, protein autoproteolysis arises when protein folding orients nucleophilic side chains, such as threonine or serine residues, toward scissile peptide bonds, with allosteric effectors further regulating cleavage by inducing conformational rearrangements.¹⁰

This demonstrates that cleavage kinetics are governed not only by the intrinsic reactivity of a bond, but also critically by the spatial positioning of neighboring functional groups. Although neighboring-group participation has been explored in synthetic polymers, such as hydroxy-functionalized side chains that promote phosphate cleavage, these systems typically exhibit slow degradation rates, often requiring long periods under environmentally relevant conditions, underscoring the limitations of neighboring-group effects without precise spatial control.¹¹ The team was inspired by biomacromolecular mechanisms such as the Thorpe-Ingold effect, which explains how replacing hydrogen atoms on a carbon chain with large alkyl groups makes it easier for the chain to bend and form a ring.¹² Conformationally preorganized neighboring groups (CPNGs) provide a rational strategy to overcome these limitations. By covalently enforcing reactive geometries that bias polymers toward intramolecular attack, CPNG-based designs enable efficient and tunable self-deconstruction of phosphate-containing polymers across molecular, macromolecular, and bulk material scales.¹³ Moreover, modulation of polymer folding offers reversible, external control over degradation by selectively aligning or misaligning nucleophilic groups with cleavage sites, establishing conformational preorganization as a powerful tool for programmable polymer deconstruction.

Discussion:

The study found that effectively “pre-folding” the structures at the molecular level provokes degradation to happen at a rate thousands of times faster than usual, without altering the polymer’s chemical composition—allowing it to stay durable until the exact moment degradation is “programmed” to happen.

“Most importantly, we found that the exact spatial arrangement of these neighboring groups dramatically changes how fast the polymer degrades,” Gu said. “By controlling their orientation and positioning, we can engineer the same plastic to break down over days, months, or even years.”¹⁴

While early laboratory tests found that the remnants of the polymers are not harmful, Gu’s team is currently continuing research to test and study the long-term remnants, primarily examining the tiny particles left behind after the polymers breakdown to see if they are environmentally hazardous. They are also currently exploring ways that their approach could be implemented into the synthetic polymer manufacturing process that, through continuous development and collaboration with manufacturing companies, could bring sustainable synthetic polymers into everyday life and significantly decrease plastic pollution.



*Figure 1.* The 3D and 2D structures of cellulose. Created using MolView and BIOVIA Draw.	*Figure 2.* The 3d and 2D structures of DNA. Created using MolView and BIOVIA Draw.


*Figure 3.*The labelled 2D rendition of the cleavable bond between an Amine and Imine. Made using MolView and Canva.	*Figure 4.* The 3D rendition of N-methylethan-1imine, the molecule pictured in Figure 3 containing an Amine, Imine, and cleavable bond. Made using MolView.