Poly butyl methacrylate

Increa sing the bulkiness of the alkyl group from the esterifying alcohol in the ester also restricts the motion of backbone polymer chains past each other, as evidenced by an increase in the T within a series of isomers. In Table 1, note the increase in T of poly(isopropyl methacrylate) over the / -propyl ester and similar trends within the butyl series. The member of the butyl series with the bulkiest alcohol chain, poly(/-butyl methacrylate), has a T (107°C) almost identical to that of poly(methyl methacrylate) (Tg = 105° C), whereas the butyl isomer with the most flexible alcohol chain, poly( -butyl methaciylate), has a T of 20°C. Further increase in the rigidity and bulk of the side chain increases the T. An example is poly(isobomyl methacrylate)... 

Table 15. Physico-mechanical characteristics and heats of mixing with chloroform (dH3) of poly(butyl methacrylate) polymerization-filled with aerosil (10% by mass) [333, 334]...

GFR Glass-fibre reinforced PBMA PBT Poly(butyl methacrylate) Poly(butylene terephthalate)... 

Polyisobutylene Cellulose acetate Poly(ethyl methacrylate) Poly(butyl methacrylate)... 

A rather limited range of mesopores in terms of size and volume were observed in the skeletons of polymer monoliths. The porosity of the polymer monolith seems to be lower than that of silica monolith. The total porosity of these monoliths is in the range of 0.61-0.73, whereas interstitial (through-pore) porosity and mesopore porosity are 0.28-0.70 and 0.03-0.24, respectively. In the case of poly(butyl methacrylate-co-ethylene dimethacrylate), the observed porosity is around 0.61-0.71, resulting in permeability 0.15-8.43 x 10 14 m2, whereas the observed porosity of silica monoliths prepared in a capillary is 0.86-0.96 and the permeability is 7-120 x 10 14 m2. Higher permeability will be advantageous for 2D applications, as mentioned later. 

Poly(butyl methacrylate) (PBMA) began to be used as a picture varnish in the early 1930s. It encountered a considerable success because of its resistance to yellowing, adequate flexibility, no dirt pick-up and good solubility in nonpolar hydrocarbon solvents. Products based on PBMA, such as Elvacite 2044 and Elvacite 2045 by Du Pont, were abandoned when it was discovered that under light exposure they cross-link to an unexpected extent becoming insoluble [64]. From this point of view acrylic copolymers based on methyl and ethyl acrylates/methacrylates show a much better long-term stability. 

Poly(butyleneterephthalate) (PBT), 20 31. See also PBT entries Poly(l,4-butyleneterephthalate) (PBT) chemical properties of, 20 65 crystal parameters for, 20 64t economic aspects of, 20 67-68 flame retardant, 20 64-65 mechanical properties of, 20 65-66 physical properties of, 20 64-65 principal world manufacturers of, 20 67t uses for, 20 63-64 Poly(butyl methacrylate)-5/oc -... 

This analysis leads to the conclusion that equation 1 is obeyed well by certain anthracene/polymer combinations, but there are significant deviations for others. DMA/PEMA (poly(ethyl methacrylate)) and DPA/PBMA (poly(butyl methacrylate)) fit equation 1 exactly, while DPA/PEMA (both with and without sensitizer) and DPA/PDPS (poly(diphenylsiloxane)) deviate the actual reaction proceeds more slowly with dose than predicted, and the deviation increases as the dose increases. 

B., 37, 362 (1995). The authors claimed that acetone solutions (5, 10 and 20%, specifically) of a sample that had gel permeation chromatography retention time close to that of a linear polystyrene of 1.1 x 106 molecular mass, had four decades lower viscosity than the corresponding solutions of flexible-chain linear poly(butyl methacrylate). However, in our opinion, neither the examined sample was characterized satisfactorily enough to be referred to as a dendrimer, nor the rheology was described sufficiently enough to draw any conclusions about the solution s flow behavior. Therefore, we refer to this paper here only for reasons of curiosity. 

Figure 17. Logarithmic dependence of the scattered light intensity, I, on time, t, for polystyrene-inter-cross-poly(butyl methacrylate) Semi-II IPN s. Registration anglel 8F) 10 ...

Which will have the higher glass transition temperature (a) poly(methylene methacrylate) or (b) poly(butyl methacrylate) ... 

Since the 1950s, synthetic polymers have been used as art binders. The most common groups are referred to as the vinyls and acrylics by artists. Both groupings represent a wide variety of polymers and copolymers and are inaccurately, or at best not accurately, named. For polymer scientists, the term vinyl generally refers to PVC, but to artists it may refer to many other materials. Even so, most of the synthetic paint market today is based on acrylics. Acrylic paints are typically water emulsions of synthetic polymers. In art, the term acrylic is used to describe a wide variety of polymers and copolymers that can be considered as derivatives of acrylic acids. Most acrylics used in art binders are PMMA (Equation 6.61), PVAc (Equation 6.64), poly( -butyl methacrylate) (Equation 6.65), and copolymers such as poly(ethyl acrylate-comethacrylate). 

Figure 5.19 Homogenous polymer blend of 2,7-diamido-l,8-naphthyridine (DAN) functionalized polystyrene and urea of guanosine (UG) functionalized poly(butyl methacrylate) (14), based on the four-point complementary complex formation between DAN and UG.

BVPy poly(butyl methacrylate-co-4-vinyl pyridine)... 

Other latexes which have been produced by this method include poly(butyl methacrylate), poly(butyl acrylate) and poly(styrene/DVB) [161]. Additionally, polymer blends were produced by mixing, under high shear, HIPEs of partially polymerised monomer, followed by completion of polymerisation. The conversion prior to blending had to be less than 5%, to allow efficient mixing of the highly viscous emulsions. The materials thus produced resembled agglomerates of latex particles, due to copolymerisation at the points of contact of partially polymerised droplets. 

Rubber-toughened polystyrene composites were obtained similarly by polymerising the dispersed phase of a styrene/SBS solution o/w HIPE [171], or a styrene/MMA/(SBS or butyl methacrylate) o/w HIPE [172], The latter materials were found to be tougher, however, all polymer composites had mechanical properties comparable to bulk materials. Other rubber composite materials have been prepared from PVC and poly(butyl methacrylate) (PBMA) [173], via three routes a) blending partially polymerised o/w HIPEs of vi-nylidene chloride (VDC) and BMA, followed by complete polymerisation b) employing a solution of PBMA in VDC as the dispersed phase, with subsequent polymerisation and c) blending partially polymerised VDC HIPE with BMA monomer, then polymerisation. All materials obtained possessed mixtures of both homopolymers plus some copolymer, and had better mechanical properties than the linear copolymers. The third method was found to produce the best material. 

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