TY - JOUR
T1 - Blends of amide-modified PBT and polycarbonate
T2 - transestrification and degradation
AU - van Bennekom, A.C.M.
AU - Pluimers, D.T.
AU - Bussink, J.
AU - Gaymans, R.J.
PY - 1997
Y1 - 1997
N2 - Blends were made of polycarbonate (PC) and polybutylene terephthalate (PBT) or amide modified polybutylene terephthalate (PBTA). The blends were prepared by solution casting, solution precipitation and melt mixing. The transesterification interchange reactions were followed by1H n.m.r. analysis. The change in the glass transition temperature (Tg) of PC has been studied as function of blending conditions, the addition of titanate catalyst inactivator, the content of Li-residues and the molecular weight of the polymers. A correlation is made between the degree of transesterification and the lowering of the glass transition. Triphenyl phosphite (TPPi) (0–2.2 wt %) was used as titanate catalyst inactivator. TPPi was found to be an effective catalyst inactivator however, this low molecular weight compound has also a strong plasticizing effect on PC. A concentration of 0.5 wt% TPPi gave a good stabilization against transesterification. Without transesterification the PBTA was found to be less miscible with PC than PBT and the PC/PBTA blends had higher Tgs for the PC phase than PC/PBT and a higher melting temperature of the system.
AB - Blends were made of polycarbonate (PC) and polybutylene terephthalate (PBT) or amide modified polybutylene terephthalate (PBTA). The blends were prepared by solution casting, solution precipitation and melt mixing. The transesterification interchange reactions were followed by1H n.m.r. analysis. The change in the glass transition temperature (Tg) of PC has been studied as function of blending conditions, the addition of titanate catalyst inactivator, the content of Li-residues and the molecular weight of the polymers. A correlation is made between the degree of transesterification and the lowering of the glass transition. Triphenyl phosphite (TPPi) (0–2.2 wt %) was used as titanate catalyst inactivator. TPPi was found to be an effective catalyst inactivator however, this low molecular weight compound has also a strong plasticizing effect on PC. A concentration of 0.5 wt% TPPi gave a good stabilization against transesterification. Without transesterification the PBTA was found to be less miscible with PC than PBT and the PC/PBTA blends had higher Tgs for the PC phase than PC/PBT and a higher melting temperature of the system.
KW - Polycarbonate
KW - Polybutylene terephthalate
KW - Polyesteramides
U2 - 10.1016/S0032-3861(96)00866-X
DO - 10.1016/S0032-3861(96)00866-X
M3 - Article
VL - 38
SP - 3017
EP - 3024
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 12
ER -