A multi-step reaction process was applied for the synthesis of a novel and well-defined starshaped telechelic macrophotoinitiator with four poly(L-lactide) (PLLA) arms connected to photoinitiating benzoin groups at the chain ends (PLLA-PI)4. To achieve this, 2,2-bis(hydroxymethyl)-1,3-propanediol was used as the initiator which constitutes the core of the star-shaped polymeric scaffold. Benzoin photoreactive end groups of the telechelic (PLLA-PI)4, capable of entering into further polymerization, allowed its use as a polymeric photoinitiator in photoinduced free radical promoted cationic polymerization of cyclohexene oxide (CHO) monomer at =350 nm to produce an (AB)4-type star-shaped block copolymer composed of both esteric L-lactide and etheric cyclohexene oxide chains on each arm, (PLLA-PCHO)4. Structural analysis and characterization of all intermediate and final compounds were done by a series of analytical and spectral methods. Molecular weights of the prepared polymers up to telechelic macrophotoinitiator (PLLA-PI)4 were determined based on 1 H-NMR (Mn H-NMR), GPC (Mn exp) analyses and theoretical calculations (Mn theo) and were found to be in good agreement with each other. Thermal properties and degradations of the prepared polymers were examined by thermogravimetric and differential thermal analyses (TG/DTA). The melting temperature for (PLLA-PCHO)4 was found higher compared to the other homo-type polymers in the literature. The thermogravimetric (TG) analyses showed that incorporation of the thermally stable PCHO block into the structure via photopolymerization improved its stability by increasing its decomposition temperature compared to the prepolymers.

In this research on the color change and the gemological analysis of a diamond which is a miracle of the nature, Fourier Transform Infrared (FT-IR) Spectroscopy and multiple gemological equipments have been used. The laboratory studies of this research have been completed in International Diamond Laboratory, IDL which is in Istanbul, Grand bazaar, and in the laboratory of Hoge Raad voor Diamant (HRD Antwerp) which means Diamond High Council. Alpha Diamond Analyzer and M-Screen have been used during the reviews. Each Diamond that was used to be researched was checked for its colors individually in the sunlight and with the help of the white paper, was measured by weight with precision balance, was checked for the sizes with a caliper, was looked into its fluorescent colors under ultraviolet lights, and it's brightness was analyzed with the help of a microscope. After these measurements were made and noted down, FT-IR analyses were made and the colors which are close to each other were compared to draw their graphics. As a result, what colors of stones give results has been explained by proving.