High Strength and High Thermal Stability of Polylactide Fibers with Stereocomplex Crystal Obtained by High-Speed Melt Spinning and Subsequent Drawing and Annealing Processes
高速熔融纺丝及后续拉伸和退火工艺获得的具有立体络合物晶体的聚丙交酯纤维的高强度和高热稳定性
基本信息
- 批准号:15350129
- 负责人:
- 金额:$ 9.86万
- 依托单位:
- 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 2005
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
To clarify the effect of molecular orientation on crystal structure change of racemate polylactide, structure formation of fibers obtained by high-speed melt spinning was investigated during heating and cooling processes. Changes in crystal structure of racemate polylactide fibers and films were analyzed by in-situ WAXD, DSC, and birefringence measurements during heating and cooling processes. The co-existence of α-form and stereocomplex crystals was observed above the take-up velocity of 4 km/min, and reflection intensity of stereocomplex crystal increased with an increase in the take-up velocity. During heating process, α-form crystals of as-spun fibers started to increase at around 80℃ which was independent of molecular orientation of as-spun fibers. The reflection intensity of stereocomplex crystal of as-spun fibers appeared when α-form crystal started to decrease. Existence of the α-form crystals in these fibers was confirmed even at melting temperature of α-form crystal of 170℃. The development of α-form crystal was also observed in the fibers drawn at 70℃. Birefringence of drawn fibers showed the highest value at 2 km/min, and decreased with increasing take-up velocity. On the other hand, birefringence of drawn decreased by annealing at 190℃ and became close to the birefringence of fibers obtained by directly annealing the high-speed spun fibers at the same temperature.
为了阐明外消旋聚乳酸的分子取向对结晶结构变化的影响,研究了高速熔融纺丝所得纤维在加热和冷却过程中的结构形成。通过原位WAXD、DSC和双折射测试分析了外消旋聚乳酸纤维和薄膜在加热和冷却过程中的晶体结构变化。在4 km/min以上的卷绕速度下,观察到α型和立体复合晶体共存,立体复合晶体的反射强度随卷绕速度的增加而增加。在加热过程中,初生纤维的α晶型在80℃左右开始增加,这与初生纤维的分子取向无关。初生纤维的立体复合晶体的反射强度出现在α型晶体开始减少时。即使在α型晶体的熔化温度为170℃时,也证实了纤维中α型晶体的存在。在70℃拉伸的纤维中也观察到α晶型的发展。拉伸纤维的双折射率在2 km/min时达到最大值,并随着卷绕速度的增加而降低。另一方面,在190℃退火后,拉伸光纤的双折射率下降,并接近于高速纺丝光纤在相同温度下直接退火后的双折射率。
项目成果
期刊论文数量(24)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Structure development of polylactides with various D-lactide contents in the high-speed melt spinning process
- DOI:10.1081/mb-120015750
- 发表时间:2003-01-01
- 期刊:
- 影响因子:0
- 作者:Takasaki, M;Ito, H;Kikutani, T
- 通讯作者:Kikutani, T
High-Speed Melt Spinning of Syndiotactic-Polystyrene ; Improvement of Spinnability and Fiber Structure Development Via Bicomponent Spinning with Atactic-Polystyrene
间规聚苯乙烯的高速熔融纺丝;
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:Y.Hada;et al.
- 通讯作者:et al.
Characterization on mixed-crystal structure of poly(butylene terephthalate/succinate/adipate) biodegradable copolymer fibers
- DOI:10.1016/j.polymer.2004.11.080
- 发表时间:2005-01
- 期刊:
- 影响因子:4.6
- 作者:X. Shi;K. Aimi;Hiroshi Ito;S. Ando;T. Kikutani
- 通讯作者:X. Shi;K. Aimi;Hiroshi Ito;S. Ando;T. Kikutani
紡糸線上での炭酸ガスレーザー照射がポリエチレンテレフタレート繊維の力学特性に与える影響
纺丝线上二氧化碳激光照射对聚对苯二甲酸乙二醇酯纤维力学性能的影响
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:Y.Hada;et al.;増田正人 他
- 通讯作者:増田正人 他
Control of High-order Structure of Poly(ethylene terephthalate) Fibers by Blending with Liquid Crystalline Polymer
与液晶聚合物共混控制聚对苯二甲酸乙二醇酯纤维的高阶结构
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:J.Kojima;T.Kikutani
- 通讯作者:T.Kikutani
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KIKUTANI Takeshi其他文献
KIKUTANI Takeshi的其他文献
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{{ truncateString('KIKUTANI Takeshi', 18)}}的其他基金
Study of prognostic factor analysis for improvement of QOL in dysphagia patients
吞咽困难患者生活质量改善的预后因素分析研究
- 批准号:
20592472 - 财政年份:2008
- 资助金额:
$ 9.86万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Effect of flow history on higher order structure development in melt-processing of fibers and films
流动历史对纤维和薄膜熔融加工中高阶结构发展的影响
- 批准号:
18350113 - 财政年份:2006
- 资助金额:
$ 9.86万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Fabrication of Time-limited Biodegradable Fibers by Control of Micro- and Macro-scopic Order Structure using Sheath-core Type Bicomponent Melt Spinning
利用皮芯型双组分熔融纺丝控制微观和宏观有序结构制备限时生物降解纤维
- 批准号:
12650877 - 财政年份:2000
- 资助金额:
$ 9.86万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Fabrication of Continuous Fiber-reinforced Thermoplastic Composites with Structural Gradient from Sheath-core Type Bicomponent Fibers
皮芯型双组分纤维制备连续纤维增强结构梯度热塑性复合材料
- 批准号:
10650675 - 财政年份:1998
- 资助金额:
$ 9.86万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Fabrication of Continuous Fiber-reinforced Thermoplastic Composites from Sheath-core Type Bicomponent Fibers
皮芯型双组分纤维连续纤维增强热塑性复合材料的制备
- 批准号:
08455308 - 财政年份:1996
- 资助金额:
$ 9.86万 - 项目类别:
Grant-in-Aid for Scientific Research (B)