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首页> 外文期刊>Macromolecules >Nanoconfinement Induced Direct Formation of Form I and III Crystals inside in Situ Formed Poly(butene-1) Nanofibrils
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Nanoconfinement Induced Direct Formation of Form I and III Crystals inside in Situ Formed Poly(butene-1) Nanofibrils

机译：纳米核序列诱导在原位形成的I和III晶体的直接形成聚（丁烯-1）纳米纤维

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摘要

We show that under relevant processing conditions, isotactic poly(butene-1) (iPB-1) directly crystallizes into the thermodynamically stable form I and III from the melt state when it is confined in nanocylinder shape domains. The iPB-1 nanofibers with an average diameter of about 200 nm confined in an incompatible polyethylene (PE) matrix show the kinetically favored form II in addition to form I. However, only form I and III are present when the average size of nanofibers is further reduced to about 60 nm after localization of organoclay nanoparticles at the interface of the iPB-1 nanofibers and PE matrix. Even though the materials were brought to temperatures higher than the melting temperature of iPB-1, the formation of unstable form II is completely suppressed by the nanoconfinement of the iPB-1 phase. It is believed that the nanoconfinement reduces the mobility of iPB-1 chains and consequently alters the kinetics of form II crystallization. The localization of organoclay at the interface completely further suppresses the formation of form II crystal by enhancing the confinement effect.
机译：我们表明，在相关的加工条件下，当其局限于纳米锗晶片结构域时，在相关的加工条件下，全同型聚（丁烯-1）（丁烯-1）（IPB-1）直接从熔体状态切成热力学稳定的形式I和III。平均直径约为200nm的IPB-1纳米纤维在不相容的聚乙烯（PE）基质中，除了形式I之外，含有动力学基于的形式II。然而，当纳米纤维的平均尺寸是时，仅存在形式I和III在IPB-1纳米纤维和PE基质的界面处的有机粘土纳米颗粒定位后进一步减少到约60nm。即使材料被带到高于IPB-1的熔化温度的温度，也可以通过IPB-1相的纳米纯净完全抑制不稳定形式II的形成。据信纳米序列降低了IPB-1链的迁移率，因此改变了形式II结晶的动力学。通过增强限制效果，在界面处的有机粘土定位完全进一步抑制了形式II晶体的形成。

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