Navneet 2,565 views. Glass transition temperature is the temperature, below which the physical properties of plastics change to those of a glassy or crystalline state. Stephen Boandoh, Frederick Osei-Tutu Agyapong-Fordjour, Soo Ho Choi, Joo Song Lee, Ji-Hoon Park, Hayoung Ko, Gyeongtak Han, Seok Joon Yun, Sehwan Park, Young-Min Kim, Woochul Yang, Young Hee Lee, Soo Min Kim, Ki Kang Kim. A glass transition temperature (Tg) is the temperature at which a polymer turns from a ductile material to a hard, brittle material. The glass transition temperature (T g) is one of the most important thermophysical properties of amorphous polymers.It is sometimes called the “melting point of amorphous materials” and as unscientific as this sounds, it is an appropiate description for the glass transition. What is glass transition temperature? At the glass transition temperature, the material converts from a hard and brittle “glassy” state to a soft and rubbery, semi-molten state. Glass transition temperature Tg. to note that there is rarely a clear transition between the rubbery and glass regions – the glass transition takes place over a range of temperature (between 10 to 50°C) and in design terms the glass transition is as much a region as a definite temperature. Like glass, amorphous PET forms when its molecules are not given enough time to arrange themselves in an orderly, crystalline fashion as the melt is cooled. Glass transition of Polypropylene Tomer H. Loading... Unsubscribe from Tomer H? All amorphous polymers follow a temperature response that is similar to that of PC. This article is cited by 16 publications. Nylon 6 serves as a model for the temperature-dependent behavior of all semi-crystalline polymers. This test method covers the assignment of the glass transition temperatures of materials using differential scanning calorimetry or … Above T … Different grades of the polypropylene will result in different physical properties and for process control and optimization, it is important to characterize the poly-propylene material. Each polymer with an amorphous structure has its own unique glass transition temperature, which makes a given polymer … Glass transition around 0oC presents problem of embrittlement and this can be altered by copolymerisation (with ethylene block copolymers) and/or blending with rubber, e.g EPM.