Polymer Crystalligation under shear Flow-Aming to Reveal the Formation Mechanism pf Fiber Structure.

剪切流下聚合物结晶揭示纤维结构的形成机制。

• 批准号: 15350133
• 负责人: KANAYA Toshiji
• 金额: $ 9.92万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15350133/
• 关键词: polymer; crystallization; flow field; shish-kebab structure; critical shear rate; high modulus fiber; high strength fiber; 流動結晶化; シシカバブ構造; 繊維構造; 小角X線散乱; 小角中性子散乱; 超高分子量成分; 高分子結晶化; せん断流動; シシケバブ構造; 偏光解消光散乱; 広角X線散乱; 異方性散乱

In this project we have studied formation mechanism of the so-called shish-kebab structure, which is a molecular origin of ultra-strong and ultra-high modulus fiber. We have studied crystallization process of some polymers (1)as a function of many factors which control the crystallization of polymers such as molecular weight, its distribution, temperature, shear rate, shear strain, (2)using several experimental methods to cover a wide spatial scale, and (3)under a mild shear condition to observe the shish-kebab formation process clearly. The main results obtained here are :(1)there exists a critical shear rate for the shish formation2)the critical shear rate is closely related to relaxation time of polymer(3)there exists a critical shear rate for the kebab formation(4)the above two critical shear rates are almost the same, showing that kebab formation is dominated by the shish formation.(5)the shish is formed before the kebab(6)high molecular weight component in a sample play an important role in the shish formation(7)entanglements play important role in shish formationIn conclusion, it is essential to study the shish formation process on the basis of the relation between the relaxation time and crystallization rate.

本计画研究了超强、超高模量纤维的分子起源-串晶结构的形成机制。我们研究了一些聚合物的结晶过程：（1）作为控制聚合物结晶的许多因素的函数，如分子量、分子量分布、温度、剪切速率、剪切应变;（2）使用多种实验方法来覆盖宽的空间尺度;（3）在温和的剪切条件下清楚地观察串晶形成过程。结果表明：（1）存在一个形成shish的临界剪切速率;（2）临界剪切速率与聚合物的弛豫时间密切相关;（3）存在一个形成kebab的临界剪切速率;（4）上述两个临界剪切速率几乎相同，表明kebab的形成以shish为主。（5）在串晶形成之前先形成串晶;（6）样品中的高分子量组分在串晶形成中起重要作用;（7）缠结在串晶形成中起重要作用。

项目成果

Shish kebab morphology induced in polyhydroxybutyrate under shear flow

• DOI: 10.1002/mame.200400181
• 发表时间: 2004-12
• 期刊: Macromolecular Materials and Engineering
• 影响因子: 3.9
• 作者: L. Sharma;Y. Ogino;T. Kanaya

Crystallization of polyethylene under shear flow as studied by time resolved depolarized light scattering. Effects of shear and shear strain,

通过时间分辨去偏振光散射研究聚乙烯在剪切流下的结晶。

• 发表时间: 2005
• 期刊: Polymer 46
• 作者: H.Fukushima;Y.Ogino;G.Matuba;K.Nishida;T.Kanaya
• 通讯作者: T.Kanaya

Crystallization of polyethylene under shear flow as studies by time resolved depolarized light scattering. Effects of shear rate an

通过时间分辨去偏振光散射研究聚乙烯在剪切流下的结晶。

• 发表时间: 2005
• 期刊: Fiber Formation in Medium and Ultra-High-Molecular-Weight Polyhydroxybutyrate Belnds under Shear Flow 46
• 作者: Fukushima H;Ogino Y;Matsuba G;Nishida K;Kanaya T
• 通讯作者: Kanaya T

Effects of high molecular weight component on crystallization of polyethylene under shear flow

• DOI: 10.1016/j.polymer.2005.08.102
• 发表时间: 2006-07-12
• 期刊: POLYMER
• 影响因子: 4.6
• 作者: Ogino, Y.;Fukushima, H.;Kanaya, T.
• 通讯作者: Kanaya, T.

Fiber Formation in Medium and Ultra-High-Molecular-Weight Polyhydroxybutyrate Belnds under Shear Flow

剪切流下中分子量和超高分子量聚羟基丁酸酯带的纤维形成

• 发表时间: 2004
• 期刊: Macromol.Mater.Eng 289
• 作者: Sharma L;Ogino Y;Kanaya T;Iwata T;Doi Y
• 通讯作者: Doi Y