Crystallization Behavior and Structural Properties of Model Semicrystalline Polyolefins

模型半结晶聚烯烃的结晶行为和结构性能

基本信息

项目摘要

The main objective of this research proposal is to improve understanding of thethermodynamic, kinetic and structural properties of non-oriented bulk crystallizedflexible chain polymers. Building on a foundation that established the importantindependent structural variables that describe the crystalline state, and final properties, aresearch program is described to advance the understanding of the interplay betweenchain microstructure, phase structure, crystallization kinetics and morphology of thedominant class of crystalline polymers, the polyolefins. Emphasis is given to novelstudies of model branched polyethylenes that serve as control microstructures to establishthe connection between molecular architecture and the semicrystalline morphology thatthey assemble. Two sets of model branched polyethyelenes will be studied. One set ofprecisely spaced branched polyethylenes serve as a bridge between the crystallization ofshort-chain molecules and the more complex behavior of industrial-like linear lowdensity polyethylenes. The second set of model long chain-branched (LCB) randomethylene copolymers will provide fundamentals for the effect of length and architectureof LCB on the crystallization behavior of these polyethylenes from isotropic melts,before additional effects intrinsic to flow, come into play. Details of the early stages ofthe crystallization of these systems serve as a basis to describe the properties of H-linkand other types of LCB poly(propylenes) also subjects of study in this proposal.The work on model systems will provide an opportunity for faculty and studentsof the University of Florida and the FAMU-FSU College of Engineering to interactclosely toward integrating catalysis, macromolecular architecture and their path to theordered state beyond each group's laboratory boundaries.The proposal also includes detailed work to substantiate a model of defectmicrostructure for Z-N based isotactic poypropylenes, derived from previous studies, aswell as a continuation of the crystallization behavior of metallocene random propylenecopolymers. In this venue emphasis is given to integrate the dynamics of thepolymorphic behavior in the analysis of the overall crystallization and the linear growthrates of these copolymers. The FAMU-FSU College of Engineering is a jointly managed program of theFlorida State University, a Research I institution with an enrollment of 38,000 andFlorida A&M University, a historically Black University with an enrollment of 12,000.Faculty hold joint appointments at both institutions, and students from both universitiesenroll in the same engineering classes. The present enrollment at the College ofEngineering consists of approximately 50% minority students and over 25% women,making it unique in a number of respects. The proposed work includes activeparticipation of graduate and undergraduate students and training in current techniques ofcharacterization of polymers. These activities parallel the commitment of the PI toeducation of students in the area of Polymer Science and Engineering.
这项研究计划的主要目的是提高对无取向块状结晶柔性链聚合物的热力学、动力学和结构性质的理解。在建立了描述结晶状态和最终性质的重要独立结构变量的基础上,描述了一个研究计划,以促进对主要类型的结晶聚合物聚烯烃的链结构、相结构、结晶动力学和形态之间的相互作用的理解。重点是作为控制微结构的模型支化聚乙烯的新研究,以建立分子结构和它们组装的半晶形态之间的联系。我们将研究两套模型支化聚乙二烯。一组精确间隔的支化聚乙烯在短链分子的结晶和工业样线性低密度聚乙烯的更复杂行为之间起到了桥梁作用。第二套模型长链支化(LCB)无规共聚物将为LCB的长度和结构对这些聚乙烯从各向同性熔体中的结晶行为的影响提供基础,然后流动固有的额外效应才会发挥作用。这些体系早期结晶阶段的细节是描述H-link和其他类型的LCB聚丙烯的性质的基础,也是本提案的研究主题。模型体系的工作将为佛罗里达大学和FAMU-FSU工程学院的教职员工和学生提供一个密切互动的机会,以整合催化剂、大分子结构及其超越每个组的实验室边界到有序状态的途径。该提案还包括详细的工作,以证实从以前的研究中得出的Z-N基等规聚丙稀的缺陷微结构模型,以及茂金属无规丙烯聚合物结晶行为的继续。在这个会场中,重点是将多晶性行为的动力学整合到分析这些共聚物的整体结晶和线性生长速率中。FAMU-FSU工程学院是佛罗里达州立大学和佛罗里达农工大学的联合管理项目,佛罗里达州立大学是一所研究I机构,招生人数为38,000人,佛罗里达农工大学是一所历史悠久的黑人大学,招生人数为12,000人。两所大学的教职员工都有联合聘任,两所大学的学生都参加相同的工程学课程。工程学院目前招收的学生中约有50%是少数民族学生,25%以上是女性,这在许多方面都是独一无二的。拟议的工作包括研究生和本科生的积极参与,以及对当前聚合物表征技术的培训。这些活动与PI对学生在聚合物科学和工程领域的教育的承诺是一致的。

项目成果

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Rufina Alamo其他文献

Solubility Parameter and Random-Coil Dimensions of Poly(1,3-Dioxolane)
聚(1,3-二氧戊环)的溶解度参数和无规卷曲尺寸
  • DOI:
    10.1295/polymj.15.491
  • 发表时间:
    1983-07-01
  • 期刊:
  • 影响因子:
    2.700
  • 作者:
    Rufina Alamo;José G Fatou;Antonio Bello
  • 通讯作者:
    Antonio Bello
Concepts of Nucleation in Polymer Crystallization
聚合物结晶成核的概念
  • DOI:
    10.3390/cryst11030304
  • 发表时间:
    2021-03
  • 期刊:
  • 影响因子:
    2.7
  • 作者:
    Jun Xu;Günter Reiter;Rufina Alamo
  • 通讯作者:
    Rufina Alamo

Rufina Alamo的其他文献

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{{ truncateString('Rufina Alamo', 18)}}的其他基金

Role of Chain Structure and Melt Topology in Polymer Crystallization
链结构和熔体拓扑在聚合物结晶中的作用
  • 批准号:
    1607786
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Kinetic Control of Crystalline Order in Olefin-Based Polymers
烯烃基聚合物晶序的动力学控制
  • 批准号:
    1105129
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
FRG: GOALI: Collaborative Research: The Role of Polymer Molecular Architecture in Controlling Morphology in Quiescent and Flow-Induced Crystallization
FRG:GOALI:协作研究:聚合物分子结构在控制静态和流动诱导结晶形态中的作用
  • 批准号:
    0706205
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Kinetic and Structural Properties of Semicrystalline Polyolefins derived from NMR, Thermal Analysis and High Resolution Microscopies
来自 NMR、热分析和高分辨率显微镜的半结晶聚烯烃的动力学和结构特性
  • 批准号:
    0094485
  • 财政年份:
    2001
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Acquisition of a Variable-Temperature Scanning Probe Microscope System for Materials Research and Education
采购用于材料研究和教育的变温扫描探针显微镜系统
  • 批准号:
    0076485
  • 财政年份:
    2000
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
POWRE: Solid-State NMR Applied to Polymer Characterization
POWRE:固态核磁共振应用于聚合物表征
  • 批准号:
    9753258
  • 财政年份:
    1998
  • 资助金额:
    --
  • 项目类别:
    Standard Grant

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