#CASTOR OIL AS A PREPO TRIAL#

#CASTOR OIL AS A PREPO TRIAL#

While we prefer to use coconut oil for pre-poo treatments, you can use your favorite hair oil if you’ll willing to do a little trial and error. It is always best to attempt to mitigate the problem and rinse the hair during the process. Unfortunately, the only way to truly determine if a specific shampoo and conditioner work well together for your hair is through trial and error. Nevertheless, for precautionary reasons, we recommend thoroughly rinsing your hair after conditioning and prior to shampooing. This build-up doesn’t always occur, however, and some shampoo and conditioner combinations work well together. When shampoo is used on hair with conditioner, there may be certain combinations that could lead to product build-up. If you’re planning to use a conditioner to pre-poo, consider that build-up can occur because of the positive (“conditioner”) and negative (“shampoo”) charges within the hair products.

The Benefits of Conditioners as a Pre-Poo Treatment In addition, individuals with naturally oily or greasy hair may not want to apply additional oil to their hair. Plus, it may take hours for some oils to penetrate into the hair. Some oils are unlikely to protect against hygral fatigue, so it’s important that you perform due diligence about the specific oil that you’re planning to use. Reading natural hair forums, we’ve noticed that some naturals are pre-pooing with argan oil, castor oil, mineral oil, and shea butter. There are some common hair oils that may not prevent the problem with hygral fatigue. When you pretreat or pre-poo natural hair with coconut oil, it is less likely to break after it has been washed. It’s important to note that you can use pre-poo for transitioning hair as well as natural hair. As a result, the hair will not feel stripped. In most cases, a single shampoo application will not remove all of the oil. Some reports on kinetics of the reaction of TDI with polypropylene glycols were recently published.Pre-poo treatments create oily hair or a greasy hair feeling. Aranguren and his coworkers studied the reactivity of ortho and para isocyanate groups of TDI with sorbitol based polyether polyols. In particular, a characteristic feature of the TDI molecule is the dierent reactivities of ortho and para isocyanate groups and the variation of reactiv- ity with temperature and type of catalyst used. However, the fundamental studies concerning kinetic and statisti- cal aspects of network formation are very few. All rights reserved INTRODUCTION Many industrially important polyurethanes are pre- pared from TDI and polyols. indicating higher reactivities of the former, both in uncatalyzed and catalyzed systems. The activation energies were found to be less ( r 6 kJ/mol) in prepolymers com- pared to C.O. The values of rate constants for prepolymers at 30 8 C were three times more ( k 1 =4.5 10 4 ) than that of C.O. The isocyanate group in the 4-position shows two to three fold higher reactivity than that in the 2-position. The kinetics of the catalyzed reaction are described by only single order equations while the kinetics of uncatalyzed reactions were described by two independent second order equations giving the reactions of ortho and para -NCO groups.

The polymerization kinetics were studied under isothermal conditions using dierent amounts of dibutyl tin dilaurate (DBTDL) as a catalyst. University of Baroda, Baroda 390 002, India and 2 Chemistry Department, Sardar Patel University, Vallabh Vidyanagar 388 120, India (Received 22 April 1997 accepted in ﬁnal form 21 July 1997) Abstract -The kinetic aspects of the polymerization reactions of castor oil (C.O.) and two polyurethane prepolymers based on it (R60 and R92), diering in their hydroxyl number, with toluene diisocyanate (TDI) has been analyzed. PATEL 2 1 Chemistry Department, Faculty of Science, M.S. KINETICS OF CASTOR OIL BASED POLYOL–TOLUENE DIISOCYANATE REACTIONS S.

Castor oil as a prepo