Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.
P. LAONUAD1,2, N. CHAIYUT1,2,* , B. KSAPABUTR1,2
Poly(lactic acid) or PLA was synthesized by direct condensation polymerisation of lactic acid. Polymerisation was carried out with tin(II) chloride as a catalyst and diphenyl ether as solvent. The obtained PLA was characterised by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (1H-NMR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). The effects of reaction temperature and reaction time on molecular weight of PLA were investigated. The molecular weight of PLA increased with increasing polymerisation temperature. The highest molecular weight which was about 2×105 g/mol was obtained at 180°C for 16 hrs at low reaction pressure. In addition, thermal properties, i.e. Tm and Tg, became decreased as reaction temperature increased. On the other hand, both molecular weight and thermal properties increased as longer polymerisation time proceeded.
Poly(lactic acid), Polycondensation, Biopolymer.
P. LAONUAD, N. CHAIYUT, B. KSAPABUTR, Poly(lactic acid) preparation by polycondensation method, Optoelectronics and Advanced Materials - Rapid Communications, 4, 8, August 2010, pp.1200-1202 (2010).
Submitted at: March 9, 2010
Accepted at: Aug. 12, 2010
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
Active accounts were imported to the new platform and assigned a random password by default. In order to access your account you need to access the login page and go through the Lost Password dialog (involves the system sending you an email with instructions) in order to reset your password. This step is necessary as passwords are kept in hashed form and the new platform uses modern hashing algorithms incompatible with the previous ones.