On the formation of narrowly polydispersed PMMA by surface initiated polymerization (SIP) from AIBN-Coated/intercalated clay nanoparticle platelets

Xiaowu Fan, Chuanjun Xia, Rigoberto C. Advincula

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Various free radical surface initiated polymerization (SIP) conditions were investigated on clay nanoparticles coated with monocationic 2,2-azobisisobutyronitrile (AIBN) type free radical initiators. Interesting differences in the mechanism of polymer nanocomposite product formation and the role of nanoparticle surface bound AIBN initiators were observed on three types of poly(methyl methacrylate) (PMMA) polymerization conditions: bulk, suspension, and solution. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) measurements confirmed the attachment of the initiator on the clay particles without decomposition of the azo group. XRD and transmission electron microscopy (TEM) showed that a well-dispersed structure was accomplished only by bulk and solution SIP. The suspension SIP product consisted of a partially exfoliated structure as shown by XRD and clay particle aggregate formation as shown by TEM. In general, the molecular weights (MWs) of the surface bound polymers were found to be lower than those of the free polymer. Using the same clay loading and initiator concentrations, we observed that relatively higher MW polymers were obtained from suspension and bulk polymerizations in contrast to solution method. However, the most interesting observation is that the surface bound polymers (on all three conditions) showed much narrower polydispersity compared to that of a typical AIBN type free radical polymerization.

Original languageEnglish
Pages (from-to)2537-2544
Number of pages8
JournalLangmuir
Volume21
Issue number6
DOIs
Publication statusPublished - 2005 Mar 15
Externally publishedYes

Fingerprint

Polymethyl Methacrylate
Platelets
platelets
Polymethyl methacrylates
polymethyl methacrylate
clays
Clay
polymerization
Polymerization
initiators
Polymers
Nanoparticles
nanoparticles
free radicals
polymers
Suspensions
Free radicals
X ray diffraction
Free Radicals
molecular weight

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

On the formation of narrowly polydispersed PMMA by surface initiated polymerization (SIP) from AIBN-Coated/intercalated clay nanoparticle platelets. / Fan, Xiaowu; Xia, Chuanjun; Advincula, Rigoberto C.

In: Langmuir, Vol. 21, No. 6, 15.03.2005, p. 2537-2544.

Research output: Contribution to journalArticle

@article{67920bb755384db2b24d398d7d3022b2,
title = "On the formation of narrowly polydispersed PMMA by surface initiated polymerization (SIP) from AIBN-Coated/intercalated clay nanoparticle platelets",
abstract = "Various free radical surface initiated polymerization (SIP) conditions were investigated on clay nanoparticles coated with monocationic 2,2-azobisisobutyronitrile (AIBN) type free radical initiators. Interesting differences in the mechanism of polymer nanocomposite product formation and the role of nanoparticle surface bound AIBN initiators were observed on three types of poly(methyl methacrylate) (PMMA) polymerization conditions: bulk, suspension, and solution. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) measurements confirmed the attachment of the initiator on the clay particles without decomposition of the azo group. XRD and transmission electron microscopy (TEM) showed that a well-dispersed structure was accomplished only by bulk and solution SIP. The suspension SIP product consisted of a partially exfoliated structure as shown by XRD and clay particle aggregate formation as shown by TEM. In general, the molecular weights (MWs) of the surface bound polymers were found to be lower than those of the free polymer. Using the same clay loading and initiator concentrations, we observed that relatively higher MW polymers were obtained from suspension and bulk polymerizations in contrast to solution method. However, the most interesting observation is that the surface bound polymers (on all three conditions) showed much narrower polydispersity compared to that of a typical AIBN type free radical polymerization.",
author = "Xiaowu Fan and Chuanjun Xia and Advincula, {Rigoberto C.}",
year = "2005",
month = "3",
day = "15",
doi = "10.1021/la048126n",
language = "English",
volume = "21",
pages = "2537--2544",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "6",

}

TY - JOUR

T1 - On the formation of narrowly polydispersed PMMA by surface initiated polymerization (SIP) from AIBN-Coated/intercalated clay nanoparticle platelets

AU - Fan, Xiaowu

AU - Xia, Chuanjun

AU - Advincula, Rigoberto C.

PY - 2005/3/15

Y1 - 2005/3/15

N2 - Various free radical surface initiated polymerization (SIP) conditions were investigated on clay nanoparticles coated with monocationic 2,2-azobisisobutyronitrile (AIBN) type free radical initiators. Interesting differences in the mechanism of polymer nanocomposite product formation and the role of nanoparticle surface bound AIBN initiators were observed on three types of poly(methyl methacrylate) (PMMA) polymerization conditions: bulk, suspension, and solution. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) measurements confirmed the attachment of the initiator on the clay particles without decomposition of the azo group. XRD and transmission electron microscopy (TEM) showed that a well-dispersed structure was accomplished only by bulk and solution SIP. The suspension SIP product consisted of a partially exfoliated structure as shown by XRD and clay particle aggregate formation as shown by TEM. In general, the molecular weights (MWs) of the surface bound polymers were found to be lower than those of the free polymer. Using the same clay loading and initiator concentrations, we observed that relatively higher MW polymers were obtained from suspension and bulk polymerizations in contrast to solution method. However, the most interesting observation is that the surface bound polymers (on all three conditions) showed much narrower polydispersity compared to that of a typical AIBN type free radical polymerization.

AB - Various free radical surface initiated polymerization (SIP) conditions were investigated on clay nanoparticles coated with monocationic 2,2-azobisisobutyronitrile (AIBN) type free radical initiators. Interesting differences in the mechanism of polymer nanocomposite product formation and the role of nanoparticle surface bound AIBN initiators were observed on three types of poly(methyl methacrylate) (PMMA) polymerization conditions: bulk, suspension, and solution. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) measurements confirmed the attachment of the initiator on the clay particles without decomposition of the azo group. XRD and transmission electron microscopy (TEM) showed that a well-dispersed structure was accomplished only by bulk and solution SIP. The suspension SIP product consisted of a partially exfoliated structure as shown by XRD and clay particle aggregate formation as shown by TEM. In general, the molecular weights (MWs) of the surface bound polymers were found to be lower than those of the free polymer. Using the same clay loading and initiator concentrations, we observed that relatively higher MW polymers were obtained from suspension and bulk polymerizations in contrast to solution method. However, the most interesting observation is that the surface bound polymers (on all three conditions) showed much narrower polydispersity compared to that of a typical AIBN type free radical polymerization.

UR - http://www.scopus.com/inward/record.url?scp=15844401274&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=15844401274&partnerID=8YFLogxK

U2 - 10.1021/la048126n

DO - 10.1021/la048126n

M3 - Article

VL - 21

SP - 2537

EP - 2544

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 6

ER -