Supercritical CO_2-Induced Stereocomplex Formationof Highly Steroregular Isotactic Poly(methyl methacrylate) and Syndiotactic Poly(methyl methacrylate) Blends: Effect of Molecular Weight on Crystalline Structure

Tomohiro Mizumoto; Norio Sugimura; Masahiko Moritani; Hajime Yasuda; Yoshiyuki Sato; Hirokatsu Masuoka

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Supercritical CO_2-Induced Stereocomplex Formationof Highly Steroregular Isotactic Poly(methyl methacrylate) and Syndiotactic Poly(methyl methacrylate) Blends: Effect of Molecular Weight on Crystalline Structure

机译：超临界CO_2诱导的高立体规等规聚（甲基丙烯酸甲酯）和间规聚（甲基丙烯酸甲酯）共混物的立体复合物形成：分子量对晶体结构的影响

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Crystalline stereocomplexes of highly stereoregular isotactic poly(methyl methacrylate) (it-PMMA) and syndiotacitc poly(methyl methacrylate) (st-PMMA) blends formed by treatment with supercritical CO_2 were investigated by means of differential scanning calorimetry (DSC) measurements as a function of PMMA molecular weight. The rates of stereocomplex formation obtained with supercritical CO_2 treatment were faster than those obtained by thermal treatment. The higher rates of stereocomplex formation can be attributed to the plasticizing effect of CO_2 molecules in the PMMA.The heat of melting of the stereocomplex (#DELTA#H) decreased with increasing PMMA molecular weight and was found to be independent of it-PMMA and st-PMMA mixing ration.For the case of it-PMMA/st-PMMA of 1:1,the stereocomplexes obtained by thermal and CO_2 treatment had two endothermic peaks. The relative intensity of the second endothermic peak (#DELTA#H)_3/#DELTA#H) decreased with increasing PMMA molecular weight and showed strpmger dependence on it-PMMA molecular weight than on the st-PMMA molecular weight.

机译：通过差示扫描量热法（DSC）测量了通过超临界CO_2处理形成的高度立构规整等规聚甲基丙烯酸甲酯（it-PMMA）和对苯二酸聚甲基丙烯酸甲酯（st-PMMA）共混物的晶体立体复合物PMMA分子量。通过超临界CO_2处理获得的立体复合物形成速率比通过热处理获得的更快。立体复合物形成的速率较高归因于PMMA中CO_2分子的塑化作用。立体复合物（＃DELTA＃H）的熔融热随着PMMA分子量的增加而降低，并且发现与PMMA和PMMA无关。 st-PMMA混合比。对于1：1的PMMA / st-PMMA，通过热处理和CO_2处理获得的立体配合物有两个吸热峰。第二吸热峰的相对强度（＃DELTA＃H）_3 /＃DELTA＃H）随PMMA分子量的增加而降低，并且显示出对st-PMMA分子量的依赖性大于与st-PMMA分子量的依赖性。

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《Macromolecules》 |2001年第15期|共5页
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Tomohiro Mizumoto; Norio Sugimura; Masahiko Moritani; Hajime Yasuda; Yoshiyuki Sato; Hirokatsu Masuoka;
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中图分类化学;有机化学;
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1. Supercritical CO_2-Induced Stereocomplex Formationof Highly Steroregular Isotactic Poly(methyl methacrylate) and Syndiotactic Poly(methyl methacrylate) Blends: Effect of Molecular Weight on Crystalline Structure [J] . Tomohiro Mizumoto, Norio Sugimura, Masahiko Moritani, Macromolecules . 2001,第15期

机译：超临界CO_2诱导的高立体规等规聚（甲基丙烯酸甲酯）和间规聚（甲基丙烯酸甲酯）共混物的立体复合物形成：分子量对晶体结构的影响
2. Structure and properties of highly stereoregular isotactic poly(methyl methacrylate) and syndiotactic poly(methyl methacrylate) blends treated with supercritical CO2 [J] . Shigeo Asai, Takatsugu Kawano, Shin-ichi Hirota Polymer: The International Journal for the Science and Technology of Polymers . 2007,第17期

机译：用超临界CO2处理的高度立体规则的等规聚甲基丙烯酸甲酯和间规聚甲基丙烯酸甲酯共混物的结构和性能
3. Pentaerythritol particles covered by layer-by-layer self assembled thin films with stereocomplex of isotactic poly(methyl methacrylate) and syndiotactic poly(methyl methacrylate) [J] . Seitz Steffen, Akashi Mitsuru, Ajiro Hiroharu Colloid and polymer science . 2017,第9期

机译：由层间自组装薄膜覆盖的季戊四醇颗粒，其立体络合物的全同立构多（甲基丙烯酸甲酯）和Syndoticatic Poly（甲基丙烯酸甲酯）
4. Synthesis of Poly(methyl methacrylate-co- hydroxyethyl methacrylate)-b- Polyisobutylene-b-Poly(methyl methacrylate-co-hydroxyethyl methacrylate) [C] . Dingsong Feng, Rudolf Faust PMSE Symposia . 2007

机译：聚（甲基丙烯酸甲酯 - 羟乙基甲基丙烯酸甲酯）-B-聚异丁烯-B-聚（甲基丙烯酸甲酯 - 甲基丙烯酸甲酯）的合成
5. Stereocomplex poly (methyl methacrylate) fibers and self-reinforced composites, and, Structural color of butterflies and beetles - characterization, replication and mimicry. [D] . Crne, Matija. 2009

机译：立体复合物聚（甲基丙烯酸甲酯）纤维和自增强复合材料，以及蝴蝶和甲虫的结构颜色-表征，复制和模仿。
6. Synthesis of Isotactic-block-Syndiotactic Poly(methyl Methacrylate) via Stereospecific Living Anionic Polymerizations in Combination with Metal-Halogen Exchange, Halogenation, and Click Reactions [O] . Naoya Usuki, Kotaro Satoh, Masami Kamigaito 2011

机译：立体定向活性阴离子聚合结合金属-卤素交换，卤化和点击反应合成等规嵌段间同聚甲基丙烯酸甲酯
7. Association of Stereoregular Poly(methyl methacrylates). 6. Double-Stranded Helical Structure of the Stereocomplex of Isotactic and Syndiotactic Poly(methyl methacrylate) [O] . Bosscher, Flip, Brinke, Gerrit ten, Challa, Ger 1982

机译：立体球聚（甲基丙烯酸甲酯）的协会。 6.等规和间规聚甲基丙烯酸甲酯的立体复合体的双链螺旋结构

Supercritical CO_2-Induced Stereocomplex Formationof Highly Steroregular Isotactic Poly(methyl methacrylate) and Syndiotactic Poly(methyl methacrylate) Blends: Effect of Molecular Weight on Crystalline Structure

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