Effect of Scalp Position on Tensile Properties of Single Hair Fibers.

Background: Hair tensile properties play a crucial role in cosmetology regarding functionality and quality. Commonly, scalp positions are subjected to varying magnitudes of environmental and physical stimuli and correspondingly different hair balding patterns are observed.

Aim: This study is aimed at comparing the tensile properties of hair from four different scalp positions and quantifying the differences using statistical methods.

Correlation between Mechanical and Thermal Properties of Human Hair.

Context: Hair strength depends on integrity of protein structure, aging, and chemical effects and its exposure to mechanical (combing and curling) and thermal (hair drying and straightening) stimuli.

Aims: The aim of this study is to correlate the mechanical properties such as tensile yield stress and tensile modulus of single hair fibers with thermal properties such as melting enthalpy and melting point obtained by differential scanning calorimetry.

Materials And Methods: Single hair fibers covering seven decades of age were cut 2 cm above the scalp.