สำนักราชบัณฑิตยสภา

105 Jaruwan Krongsin, Roongkan Nuisin, Supaporn Noppakundilograt, Suda Kiatkamjornwong วารสารราชบัณฑิตยสถาน ปีที่ ๓๗ ฉบับที่ ๔ ต.ค.-ธ.ค. ๒๕๕๕ The negative charge of the hair is attracted to the positively charges conditioner molecules via ionic bonds which allow the conditioner to deposit on the hair. The deposition of the conditioner to the hair results in a reduction of static electricity on the hair surfaces, and consequently increases the hair smoothness. The smooth and soft feels enable easier combing and detangling. The con- ditioner layer also flattens the cuticle scales against each other, which increases hairs shine, thus the conditioner helps improve the hair quality and appearance. 20 CONCLUSIONS The flow behavior of chitosan/menthol microcapsule emulsion, conditioner base, and leave-on conditioner is thixotropy in nature. The size of the hysteresis loop was largest in the conditioner base and a bit smaller size than the conditioner base was found in the leave-on con- ditioner while chitosan/menthol emulsion was the smallest. The stability of the hair conditioner depended on both the rheological behavior of the conditioner base and the emulsion of chitosan/ menthol emulsion. The leave-on hair conditioner of chitosan/menthol emulsion base was stable as evaluated by rheological measurement. The hair conditioner rendered hair with softness and easy combing as indicated by the flattened cuticle scales and improved hair shinning. Figure 5