Gained novel insights into the aggregation behavior of shampoo formulations with a model hair surface
Demonstrated the impact of polymer topology and related the observed polymer interactions to experimental observables
Established a framework for studying complex formulations in contact with biomimetic surfaces using molecular dynamics simulations
Accelerated rational design of eco-friendly cosmetic formulations
Changes in consumer behaviors are driving increased demand for green and eco-friendly products in the cosmetic industry. Substitution of natural, bio-based polymers for petrochemicalderived ingredients in consumer formulations has become an active area of research. However, the complexity of these formulations, typically mixtures of surfactants, salt and polymers, makes it non-trivial to replace an ingredient and anticipate its effect on product properties.
Effective and efficient reformulation that maintains comparable performance to existing products requires a deep understanding of the differences in behavior between polymers, which can be time and resource intensive using the traditional experimental approach.
Scientists from L’Oreal and Schrödinger explored the behavioral differences of synthetic polymers and eco-friendly polymers in hair formulations by building realistic models of complex formulation and hair surfaces. All models and simulations were performed using the Schrödinger Materials Science Suite and Desmond for molecular dynamics (MD) according to the following procedure:
This work demonstrates an approach for studying the interaction of complex polymer/surfactant formulations with biological substrates via MD simulations. Detailed, experiment-inspired allatom molecular models were used in order to parameterize coarse-grained simulations capable of portraying aggregation and adsorption behavior. Continued progress in this area will establish particle-based simulation as a viable technique for designing new eco-friendly formulations.
Distinct behaviors are observed among polymers (M100, M2003 and PS) as a result of their chemical architecture. The quaternary ammonium groups common to all three polymers play an important role in bulk aggregation, as well as in interactions with surfactant-coated healthy hair surfaces
In M2003, the hydrophilic block does not incorporate into aggregates, but it does adhere to the damaged surface, a quality not shown by the other polymers
In PS, the highly branched carbohydrate backbone offers a favorable environment for surfactants, and may help increase surfactant solubility. The 12-carbon alkane chains branching off each monomer makes it the only polymer that comes in direct contact with the healthy hair surface
The data suggests that the length of the polymer chain can play a role in lubrication properties
The exploratory measurements in this study demonstrate that it is possible to quantify frictional coefficients of hair against complex formulations. Large scale, systematic studies that allow for more detailed comparisons between polymers of interest are a clear next step in advancing this area of study. In future work, we intend to examine friction as a function of variations to formulation compositions, polymer chain lengths, model hair surface topology, shear rate as well as distance between hair surfaces.
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