Normal Freezing of Solutions of Isobutylene Polymers and Copolymers

1968 ◽  
Vol 41 (5) ◽  
pp. 1288-1293
Author(s):  
Jeanpierre Dole-Robbe
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Distribution Coefficient ◽  
Benzene Solution ◽  
Freezing Rate ◽  
Dilute Solutions ◽  
Poly Methyl Methacrylate ◽  
Methacrylate Copolymers

Abstract Normal freezing of dilute solutions of polyisobutylene in cyclohexane was examined. Variation in distribution coefficient with freezing rate and molecular weight of the solute was observed, as well as establishment of a gradient for molecular weight in the frozen charge. Polyisobutylene-polystyrene or poly (methyl methacrylate) copolymers were likewise frozen, in benzene solution.

Effect of Molecular Weight on Competitive Self-Assembly of Poly(3-dodecylthiophene)-block-poly(methyl methacrylate) Copolymers

2016 ◽  
Vol 49 (9) ◽  
pp. 3647-3653 ◽  
Author(s):  
Jicheol Park ◽  
Kyu Seong Lee ◽  
Chungryong Choi ◽  
Jongheon Kwak ◽  
Hong Chul Moon ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Self Assembly ◽  
Poly Methyl Methacrylate ◽  
Methacrylate Copolymers

Synthesis of poly(methyl methacrylate)-b-poly(acrylic acid) by DPE method

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Dong Chen ◽  
Ruixue Liu ◽  
Zhifeng Fu ◽  
Yan Shi
Keyword(s):  
Molecular Weight ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Amphiphilic Diblock Copolymer ◽  
Poly Methyl Methacrylate ◽  
Copolymer Poly ◽  
Poly Acrylic Acid

AbstractAmphiphilic diblock copolymer poly(methyl methacrylate)-b-poly(acrylic acid) (PMMA-b-PAA) was prepared by 1,1-diphenylethene (DPE) method. Firstly, free radical polymerization of methyl methacrylate was carried out with AIBN as initiator in the presence of DPE, giving a DPE-containing PMMA precursor with controlled molecular weight. tert-Butyl acrylate (tBA) was then polymerized in the presence of the PMMA precursor, and PMMA-b-PtBA diblock copolymer with controlled molecular weight was prepared. Finally, amphiphilic diblock copolymer PMMA-b-PAA was obtained by hydrolysis of PMMA-b-PtBA. The formation of PMMA-b-PAA was confirmed by 1H NMR spectrum and gel permeation chromatography. Transmission electron microscopy and dynamic light scattering were used to detect the self-assembly behavior of the amphiphilic diblock polymers in methanol.

Variation of periodic crazing based on polymer blends of an ultra-high and a low molecular weight poly(methyl methacrylate)

2016 ◽  
Vol 134 (1) ◽  
Author(s):  
Keishi Naito ◽  
Akiyoshi Takeno ◽  
Ryota Morifuji ◽  
Toshiaki Miyata ◽  
Minoru Miwa ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Polymer Blends ◽  
Low Molecular Weight ◽  
Poly Methyl Methacrylate

Molecular weight and processing effects on the dissolution properties of thin poly(methyl methacrylate) films

2008 ◽  
Vol 85 (1) ◽  
pp. 93-99 ◽  
Author(s):  
A. Kokkinis ◽  
E.S. Valamontes ◽  
D. Goustouridis ◽  
Th. Ganetsos ◽  
K. Beltsios ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate ◽  
Dissolution Properties ◽  
Processing Effects

scholarly journals Effect of Ferocene Concentration on the Percent Conversion and Molecular Weight of Poly(Methyl Methacrylate) Homopolymers

2017 ◽  
Vol 14 (2) ◽  
pp. 311-319
Author(s):  
Baghdad Science Journal
Keyword(s):  
Molecular Weight ◽  
Free Radical ◽  
Methyl Methacrylate ◽  
Benzoyl Peroxide ◽  
Radical Polymerization ◽  
Free Oxygen ◽  
Poly Methyl Methacrylate ◽  
Methacrylate Monomer ◽  
Percent Conversion ◽  
Methyl Methacrylate Monomer

This research is addressing the effect of different ferrocene concentration (0.00, 2.15x10-3, 4.30x10-3, 8.60x10-3, and 12.9x10-3) on the bulk free radical polymerization of methyl methacrylate monomer in benzene using benzoyl peroxide as initiator. The polymerization was conducted at 60º C under free oxygen atmosphere. The resulting polymers were characterized by FTIR. The results were compared with the presence and absence of ferrocene at 10% conversion. The %conversion was 3.04% with no ferrocene present in the polymerization medium and its increase to 9.06 with a first lowest ferrocene concentration added, i.e. 2.15 x10-3mol/l. This was positively reflected on the poly(methyl methacrylate) molecular weight measured by viscosity technique, especially in the presence of ferrocene.

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