Melting Temperature of Mixed-Microstructure Polybutadiene

Ralph H. Colby, George E. Milliman, William W. Graessley

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Polymerization of butadiene with lithium alkyls in hydrocarbon media produces a chemical microstructure with roughly equal amounts of 1,-cis and 1,4-trans units and a lesser amount (~8%) of 1,2 (vinyl) units. The high molecular weight versions of those polymers appear to be amorphous at all temperatures. For example, no calorimetric evidence has been reported for a phase transition from the glass temperature, Tg~ -99 °C, to temperatures in excess of 100 °C. This absence of crystallinity seems reasonable in view of the mixed microstructure and similar results for other copolymer-like systems such as stereoirregular polystyrene. The purpose of this note is to report some observations on low molecular weight polybutadienes with this microstructure which suggest the occurrence of crystallization at low temperatures.

Original languageEnglish (US)
Pages (from-to)1261-1262
Number of pages2
JournalMacromolecules
Volume19
Issue number4
DOIs
StatePublished - Jan 1 1986

Fingerprint

Polybutadienes
Melting point
Microstructure
Molecular weight
Temperature
Polystyrenes
Hydrocarbons
Crystallization
Butadiene
Lithium
Polymers
Copolymers
Phase transitions
Polymerization
Glass
polybutadiene

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Colby, Ralph H. ; Milliman, George E. ; Graessley, William W. / Melting Temperature of Mixed-Microstructure Polybutadiene. In: Macromolecules. 1986 ; Vol. 19, No. 4. pp. 1261-1262.
@article{d0fc999332274318b6d5bb5416710340,
title = "Melting Temperature of Mixed-Microstructure Polybutadiene",
abstract = "Polymerization of butadiene with lithium alkyls in hydrocarbon media produces a chemical microstructure with roughly equal amounts of 1,-cis and 1,4-trans units and a lesser amount (~8{\%}) of 1,2 (vinyl) units. The high molecular weight versions of those polymers appear to be amorphous at all temperatures. For example, no calorimetric evidence has been reported for a phase transition from the glass temperature, Tg~ -99 °C, to temperatures in excess of 100 °C. This absence of crystallinity seems reasonable in view of the mixed microstructure and similar results for other copolymer-like systems such as stereoirregular polystyrene. The purpose of this note is to report some observations on low molecular weight polybutadienes with this microstructure which suggest the occurrence of crystallization at low temperatures.",
author = "Colby, {Ralph H.} and Milliman, {George E.} and Graessley, {William W.}",
year = "1986",
month = "1",
day = "1",
doi = "10.1021/ma00158a054",
language = "English (US)",
volume = "19",
pages = "1261--1262",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "4",

}

Melting Temperature of Mixed-Microstructure Polybutadiene. / Colby, Ralph H.; Milliman, George E.; Graessley, William W.

In: Macromolecules, Vol. 19, No. 4, 01.01.1986, p. 1261-1262.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Melting Temperature of Mixed-Microstructure Polybutadiene

AU - Colby, Ralph H.

AU - Milliman, George E.

AU - Graessley, William W.

PY - 1986/1/1

Y1 - 1986/1/1

N2 - Polymerization of butadiene with lithium alkyls in hydrocarbon media produces a chemical microstructure with roughly equal amounts of 1,-cis and 1,4-trans units and a lesser amount (~8%) of 1,2 (vinyl) units. The high molecular weight versions of those polymers appear to be amorphous at all temperatures. For example, no calorimetric evidence has been reported for a phase transition from the glass temperature, Tg~ -99 °C, to temperatures in excess of 100 °C. This absence of crystallinity seems reasonable in view of the mixed microstructure and similar results for other copolymer-like systems such as stereoirregular polystyrene. The purpose of this note is to report some observations on low molecular weight polybutadienes with this microstructure which suggest the occurrence of crystallization at low temperatures.

AB - Polymerization of butadiene with lithium alkyls in hydrocarbon media produces a chemical microstructure with roughly equal amounts of 1,-cis and 1,4-trans units and a lesser amount (~8%) of 1,2 (vinyl) units. The high molecular weight versions of those polymers appear to be amorphous at all temperatures. For example, no calorimetric evidence has been reported for a phase transition from the glass temperature, Tg~ -99 °C, to temperatures in excess of 100 °C. This absence of crystallinity seems reasonable in view of the mixed microstructure and similar results for other copolymer-like systems such as stereoirregular polystyrene. The purpose of this note is to report some observations on low molecular weight polybutadienes with this microstructure which suggest the occurrence of crystallization at low temperatures.

UR - http://www.scopus.com/inward/record.url?scp=1642269878&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=1642269878&partnerID=8YFLogxK

U2 - 10.1021/ma00158a054

DO - 10.1021/ma00158a054

M3 - Article

AN - SCOPUS:1642269878

VL - 19

SP - 1261

EP - 1262

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 4

ER -