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High Tm poly(L-lactide)s via REP or ROPPOC of L-lactide
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020/02/19 , DOI: 10.1039/c9py01908a Hans R. Kricheldorf 1, 2, 3, 4 , Steffen M. Weidner 4, 5, 6, 7 , Andreas Meyer 2, 3, 4, 8
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020/02/19 , DOI: 10.1039/c9py01908a Hans R. Kricheldorf 1, 2, 3, 4 , Steffen M. Weidner 4, 5, 6, 7 , Andreas Meyer 2, 3, 4, 8
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A new kind of high melting (HTm) pol(L-lactide) was discovered when cyclic poly(L-lactide)s were prepared by ring-expansion polymerization with cyclic tin catalysts at 130–160 °C in bulk. By DSC measurements with 10 K min−1 melting temperatures (Tm) in the range of 190–196 °C were found. The WAXS and SAXS measurements evidenced that not a new crystal lattice but a well-ordered morphology and a higher perfection of the crystallites are responsible for the high Tm values and high crystallinities. Under identical reaction conditions SnOct2-catalyzed and alcohol-initiated ROPs do not yield these crystallites. Furthermore, it was found that the standard crystallites are kinetically favored upon rapid crystallization, whereas the high melting form of poly(L-lactide) is thermodynamically more stable.
中文翻译：
通过L-丙交酯的REP或ROPPOC获得高Tm聚L-丙交酯
当用环状锡催化剂在130-160°C的温度下通过扩环聚合制备环状聚（L-丙交酯）时，发现了一种新型的高熔点（H T m）pol（L-丙交酯）。通过DSC测量，发现10 K min -1的熔化温度（T m）在190–196°C的范围内。WAXS和SAXS的测量结果表明，不是新的晶格，而是有序的形态和较高的微晶完善度是高T m值和高结晶度的原因。在相同的反应条件下，SnOct 2催化和醇引发的ROP不会产生这些微晶。此外，发现在快速结晶时动力学上有利于标准微晶，而聚（L-丙交酯）的高熔点形式在热力学上更稳定。
更新日期：2020-03-24
中文翻译：
通过L-丙交酯的REP或ROPPOC获得高Tm聚L-丙交酯
当用环状锡催化剂在130-160°C的温度下通过扩环聚合制备环状聚（L-丙交酯）时，发现了一种新型的高熔点（H T m）pol（L-丙交酯）。通过DSC测量，发现10 K min -1的熔化温度（T m）在190–196°C的范围内。WAXS和SAXS的测量结果表明，不是新的晶格，而是有序的形态和较高的微晶完善度是高T m值和高结晶度的原因。在相同的反应条件下，SnOct 2催化和醇引发的ROP不会产生这些微晶。此外，发现在快速结晶时动力学上有利于标准微晶，而聚（L-丙交酯）的高熔点形式在热力学上更稳定。
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