Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (1): 133.doi: 10.7503/cjcu20160619
• Polymer Chemistry • Previous Articles Next Articles
ZHANG Min, ZHANG Shuyang, LIU Zhengying, YANG Wei, YANG Mingbo*()
Received:
2016-09-01
Online:
2017-01-10
Published:
2016-11-11
Contact:
YANG Mingbo
E-mail:yangmb@scu.edu.cn
Supported by:
CLC Number:
TrendMD:
ZHANG Min, ZHANG Shuyang, LIU Zhengying, YANG Wei, YANG Mingbo. Correlation of Transesterification Between Poly(lactic acid) and Poly(propylene carbonate) on Catalysts†[J]. Chem. J. Chinese Universities, 2017, 38(1): 133.
Samplea | Mass fraction(%) | |||
---|---|---|---|---|
PLA | PPC | Sn(Oct)2 | TBT | |
PLA-0 | 100 | |||
PLA-0.5S | 100 | 0.5 | ||
PLA-0.5T | 100 | 0.5 | ||
PPC-0 | 100 | |||
PPC-0.5S | 100 | 0.5 | ||
PPC-0.5T | 100 | 0.5 | ||
AC-0 | 50 | 50 | ||
AC-0.5S | 50 | 50 | 0.5b | |
AC-0.5T | 50 | 50 | 0.5c | |
AC-0.5ST | 50 | 50 | 0.5b | 0.5c |
AC-0.5ST-2 | 50 | 50 | 0.5b | 0.5c |
Table 1 Compositions of reactive blends and codes for samples
Samplea | Mass fraction(%) | |||
---|---|---|---|---|
PLA | PPC | Sn(Oct)2 | TBT | |
PLA-0 | 100 | |||
PLA-0.5S | 100 | 0.5 | ||
PLA-0.5T | 100 | 0.5 | ||
PPC-0 | 100 | |||
PPC-0.5S | 100 | 0.5 | ||
PPC-0.5T | 100 | 0.5 | ||
AC-0 | 50 | 50 | ||
AC-0.5S | 50 | 50 | 0.5b | |
AC-0.5T | 50 | 50 | 0.5c | |
AC-0.5ST | 50 | 50 | 0.5b | 0.5c |
AC-0.5ST-2 | 50 | 50 | 0.5b | 0.5c |
Sample | 10-4 Mn | 10-4 Mw | PDI | Sample | 10-4 Mn | 10-4 Mw | PDI |
---|---|---|---|---|---|---|---|
PLA-0 | 5.2 | 12.3 | 2.4 | PPC-0 | 9.2 | 58.6 | 6.3 |
PLA-0.5S | 3.9 | 7.1 | 1.8 | PPC-0.5S | 7.0 | 29.8 | 4.3 |
PLA-0.5T | 6.3 | 13.6 | 2.2 | PPC-0.5T | 3.0 | 5.7 | 1.9 |
Table 2 GPC data statistics of pure sample/catalyst reaction system
Sample | 10-4 Mn | 10-4 Mw | PDI | Sample | 10-4 Mn | 10-4 Mw | PDI |
---|---|---|---|---|---|---|---|
PLA-0 | 5.2 | 12.3 | 2.4 | PPC-0 | 9.2 | 58.6 | 6.3 |
PLA-0.5S | 3.9 | 7.1 | 1.8 | PPC-0.5S | 7.0 | 29.8 | 4.3 |
PLA-0.5T | 6.3 | 13.6 | 2.2 | PPC-0.5T | 3.0 | 5.7 | 1.9 |
Fig.3 1H NMR spectra of pure samples(A), reactive samples(B) and solid residue(a) and soluble substance(b) of AC-0.5ST after extraction(C) (B) a. AC-0; b. AC-0.5S; c. AC-0.5T; d. AC-0.5ST; e. AC-0.5ST-2.
Sample | 10-4 Mn | 10-4 Mw | PDI | Distribution percentage of Mw(%) | |
---|---|---|---|---|---|
<2.0×104 | >60.0×104 | ||||
PLA | 5.7 | 11.9 | 2.1 | 4 | 0 |
AC-0 | 6.6 | 32.6 | 5.0 | 5 | 11 |
AC-0.5S | 6.7 | 37.2 | 5.6 | 5 | 14 |
AC-0.5T | 7.2 | 41.1 | 5.7 | 4 | 14 |
AC-0.5ST | 6.1 | 35.5 | 5.9 | 7 | 13 |
AC-0.5ST-2 | 4.4 | 24.6 | 5.6 | 10 | 8 |
PPC | 4.3 | 36.7 | 8.5 | 11 | 13 |
Table 3 GPC data statistics of samples
Sample | 10-4 Mn | 10-4 Mw | PDI | Distribution percentage of Mw(%) | |
---|---|---|---|---|---|
<2.0×104 | >60.0×104 | ||||
PLA | 5.7 | 11.9 | 2.1 | 4 | 0 |
AC-0 | 6.6 | 32.6 | 5.0 | 5 | 11 |
AC-0.5S | 6.7 | 37.2 | 5.6 | 5 | 14 |
AC-0.5T | 7.2 | 41.1 | 5.7 | 4 | 14 |
AC-0.5ST | 6.1 | 35.5 | 5.9 | 7 | 13 |
AC-0.5ST-2 | 4.4 | 24.6 | 5.6 | 10 | 8 |
PPC | 4.3 | 36.7 | 8.5 | 11 | 13 |
Sample | TgC/℃ | TgA/℃ | TgA-TgC/℃ | ΔHm/(J·g-1) | Tcc/℃ | Tm/℃ |
---|---|---|---|---|---|---|
PLA | 60.64 | 0.30 | 155.63 | |||
AC-0 | 39.35 | 59.41 | 20.06 | 8.08 | 125.94 | 151.72 |
AC-0.5S | 34.02 | 54.20 | 20.18 | 12.86 | 115.88 | 147.23, 154.81 |
AC-0.5T | 36.45 | 57.54 | 21.09 | 12.05 | 124.93 | 151.14 |
AC-0.5ST | 34.30 | 54.40 | 20.10 | 11.80 | 119.82 | 148.41, 154.68 |
AC-0.5ST-2 | 34.99 | 52.51 | 17.54 | 15.47 | 109.58 | 144.95, 153.04 |
PPC | 37.45 |
Table 4 DSC data statistics of samples after the second heating
Sample | TgC/℃ | TgA/℃ | TgA-TgC/℃ | ΔHm/(J·g-1) | Tcc/℃ | Tm/℃ |
---|---|---|---|---|---|---|
PLA | 60.64 | 0.30 | 155.63 | |||
AC-0 | 39.35 | 59.41 | 20.06 | 8.08 | 125.94 | 151.72 |
AC-0.5S | 34.02 | 54.20 | 20.18 | 12.86 | 115.88 | 147.23, 154.81 |
AC-0.5T | 36.45 | 57.54 | 21.09 | 12.05 | 124.93 | 151.14 |
AC-0.5ST | 34.30 | 54.40 | 20.10 | 11.80 | 119.82 | 148.41, 154.68 |
AC-0.5ST-2 | 34.99 | 52.51 | 17.54 | 15.47 | 109.58 | 144.95, 153.04 |
PPC | 37.45 |
Scheme 1 Possible reaction mechanism of PLA/PPC system (Ⅰ) Degradation and intermolecular transesterification of PLA; (Ⅱ) degradation and intermolecular transesterification of PPC; (Ⅲ) transesterification of PLA/PPC.
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