Influence of Crosslinking on Surface Hardness of Poly(Methyl Methacrylate)

The influence of crosslinking on the surface hardness of poly-(methyl methacrylate) sheets examined by means of damping of standard pendulum oscillations as well as on the nonisothermal mass loss is discussed in this paper. Crosslinked poly(methyl methacrylate)s with different crosslink densities we...

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Bibliographic Details
Published in:Journal of macromolecular science. Part A, Pure and applied chemistry Pure and applied chemistry, 1997-01, Vol.34 (1), p.81-90
Main Authors: Pavlinec, J., Lazár, M., Janigová, I.
Format: Article
Language:English
Subjects:
Applied sciences
Crosslinked copolymers
Diamine crosslinking
Exact sciences and technology
Mechanical properties
Organic polymers
Physicochemistry of polymers
Poly(methyl methacrylate)
Properties and characterization
Surface hardness
TG analyses
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Summary:The influence of crosslinking on the surface hardness of poly-(methyl methacrylate) sheets examined by means of damping of standard pendulum oscillations as well as on the nonisothermal mass loss is discussed in this paper. Crosslinked poly(methyl methacrylate)s with different crosslink densities were prepared by copolymerization of methyl methacrylate with polyfunctional comonomers of the allyl and vinyl type and by additional crosslinking of poly(methyl methacrylate) by transamination with aliphatic α,ω-diamines. The highest increase in surface hardness, up to 52% of its value for a silicate plate glass standard, was observed for (PMMA-co-DAlP) sheets with 17 to 25 wt% of comonomer. For commercial noncrosslinked PMMA cast sheets, this value is only 27% of the above standard. Comonomers of the allylic type are more suitable than the methacrylic multifunctional crosslinkers. A large portion of the double bonds remains unreacted if a high concentration of multifunctional agent is copolymerized with MMA. A similar effect on PMMA surface hardness was achieved using substantially lower concentrations of α,ω-diamines as transamination crosslinking agents. Diamine crosslinked PMMA is also a thermally more stable material compared to copolymer networks and noncrosslinked PMMA. Volatilization of the main portion (> 80 wt%) of PMMA crosslinked with 5 wt% of 1,3-DAP is shifted to a higher temperature compared to the standard PMMA by 200 K. The shape of the TG curves and thermal stability of MMA-co-multimethacrylates copolymers differ only slightly from the noncrosslinked PMMA.
ISSN:1060-1325
1520-5738
DOI:10.1080/10601329708014936