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Stereocomplexation in Copolymer Networks Incorporating Enantiomeric Glycerol-Based 3-Armed Lactide Oligomers and a 2-Armed ɛ-Caprolactone Oligomer

机译:结合了对映体甘油的3-臂丙交酯低聚物和2-臂ɛ-己内酯低聚物的共聚物网络中的立体复合。

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摘要

The reactions of enantiomeric glycerol-based 3-armed lactide oligomers (H3DLAO and H3LLAO) and a diethylene glycol-based 2-armed ɛ-caprolactone oligomer (H2CLO) with hexamethylene diisocyanate (HDI) produced polyesterurethane copolymer networks (PEU-3scLAO/2CLOs 100/0, 75/25, 50/50, 25/75 and 0/100) with different feed ratios of stereocomplex (sc) lactide oligomer (H3scLAO = H3DLAO + H3LLAO, H3DLAO/H3LLAO = 1/1) and H2CLO. Thermal and mechanical properties of the copolymer networks were compared with those of a simple homochiral (hc) network (PEU-3DLAO) produced by the reaction of H3DLAO and HDI. X-ray diffraction and differential scanning calorimetric analyses revealed that sc crystallites are formed without any hc crystallization for PEU-3scLAO/2CLOs, and that PEU-3DLAO is amorphous. The melting temperatures of sc crystallites for PEU-3scLAO/2CLOs were much higher than that of hc crystallites of H3DLAO. The polarized optical microscopic analysis revealed that the nucleation efficiency is enhanced with increasing feed of H3scLAO fraction, whereas the spherulite growth rate is accelerated with increasing feed H2CLO fraction over 100/0-50/50 networks. PEU-3scLAO/2CLO 100/0 (i.e., PEU-3scLAO) exhibited a higher tensile strength and modulus than PEU-3DLAO. The elongation at break and tensile toughness for PEU-3scLAO/2CLOs increased with an increasing feed amount of H2CLO.
机译:对映体甘油基3臂丙交酯低聚物(H3DLAO和H3LLAO)和二甘醇基2臂ɛ-己内酯低聚物(H2CLO)与六亚甲基二异氰酸酯(HDI)的反应产生了聚酯聚氨酯共聚物网络(PEU-3scLAO / 2CLOs 100 / 0、75 / 25、50 / 50、25 / 75和0/100)和立体配合物(sc)丙交酯低聚物的进料比(H3scLAO = H3DLAO + H3LLAO,H3DLAO / H3LLAO = 1/1)和H2CLO。将共聚物网络的热和机械性能与通过H3DLAO和HDI反应生成的简单均手性(hc)网络(PEU-3DLAO)的热性能和机械性能进行了比较。 X射线衍射和差示扫描量热分析显示,PEU-3scLAO / 2CLOs形成sc晶体而没有任何hc结晶,并且PEU-3DLAO是无定形的。 PEU-3scLAO / 2CLO的sc微晶的熔融温度比H3DLAO的hc微晶的熔融温度高得多。偏光光学显微镜分析显示,在100 / 0-50 / 50网络中,随着H3scLAO馏分进料量的增加,成核效率提高,而随着H2CLO馏分进料量的增加,球晶的生长速度也随之加快。 PEU-3scLAO / 2CLO 100/0(即PEU-3scLAO)的拉伸强度和模量比PEU-3DLAO高。 PEU-3scLAO / 2CLO的断裂伸长率和拉伸韧性随H2CLO进料量的增加而增加。

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