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Control of the Crystalline Properties of 2-Isopropyl-2-oxazoline Copolymers in Condensed State and in Solution Depending on the Composition
Macromolecules ( IF 5.1 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acs.macromol.7b01639 Natalia Oleszko-Torbus 1 , Wojciech Wałach 1 , Alicja Utrata-Wesołek 1 , Andrzej Dworak 1
Macromolecules ( IF 5.1 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acs.macromol.7b01639 Natalia Oleszko-Torbus 1 , Wojciech Wałach 1 , Alicja Utrata-Wesołek 1 , Andrzej Dworak 1
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Copolymers of 2-isopropyl- (iPrOx) and 2-n-propyl-2-oxazoline (nPrOx) were obtained, and attempts to control their crystallization both in condensed state and in solution were made. The homopolymer of nPrOx showed a weaker crystallization tendency than PiPrOx; nevertheless, the frequently encountered assumption that it is completely amorphous and is not able to crystallize was found to be unjustified. By increasing the amount of nPrOx in copolymers, their crystallization ability decreased both in the condensed state and in solution. The highest degree of crystallization was achieved for copolymer iPrOx/nPrOx of the composition 85:15 mol %, and χc values of ∼60% in condensed state and ∼45% in water were obtained. On the other hand, for the copolymer with 50 mol % of nPrOx no crystalline fraction was observed, even when it was subjected to mild thermal treatment, both in the condensed state and in solution. However, when copolymers were subjected to more rigorous external conditions, such as exposure to high, predefined temperature for a significantly extended time, the crystallization of seemingly amorphous copolymer could be forced.
中文翻译：
控制2-异丙基-2-恶唑啉共聚物在缩合状态和溶液中的结晶性能（取决于组成）
的2-异丙基- （共聚物我PROX）和2- ñ -丙基-2-恶唑啉（Ñ得到PROX），并试图控制在二者凝聚态和在溶液中作了它们的结晶。n PrOx的均聚物显示出比P i PrOx弱的结晶趋势。然而，发现经常遇到的假设是完全无定形且不能结晶的说法是不合理的。通过增加共聚物中n PrOx的量，它们的结晶能力在缩合状态和溶液中均降低。共聚物i PrOx / n的结晶度最高的组成为85:15摩尔％PROX，和χ Ç得到的在冷凝状态〜60％，并在水中〜45％的值。另一方面，对于具有50mol％的n PrOx的共聚物，即使在缩合状态和在溶液中均进行了适度的热处理，也没有观察到结晶级分。然而，当共聚物经受更严格的外部条件时，例如暴露于高的预定温度显着延长的时间，则可能迫使看似无定形的共聚物结晶。
更新日期：2017-09-18
中文翻译：
控制2-异丙基-2-恶唑啉共聚物在缩合状态和溶液中的结晶性能（取决于组成）
的2-异丙基- （共聚物我PROX）和2- ñ -丙基-2-恶唑啉（Ñ得到PROX），并试图控制在二者凝聚态和在溶液中作了它们的结晶。n PrOx的均聚物显示出比P i PrOx弱的结晶趋势。然而，发现经常遇到的假设是完全无定形且不能结晶的说法是不合理的。通过增加共聚物中n PrOx的量，它们的结晶能力在缩合状态和溶液中均降低。共聚物i PrOx / n的结晶度最高的组成为85:15摩尔％PROX，和χ Ç得到的在冷凝状态〜60％，并在水中〜45％的值。另一方面，对于具有50mol％的n PrOx的共聚物，即使在缩合状态和在溶液中均进行了适度的热处理，也没有观察到结晶级分。然而，当共聚物经受更严格的外部条件时，例如暴露于高的预定温度显着延长的时间，则可能迫使看似无定形的共聚物结晶。
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