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The thiocarbonate moiety can be functionalized at the R-group for end group analysis. The end group is a result of the propagation of chain-transfer agents during the free-radical polymerization process. The end groups can subsequently be modified by the reaction of the thiocarbonylthio compounds with nucleophiles and ionic reducing agents. [11]
Its AO-Cap series included SMD capacitors with stacked anode in "D" size with heights from 1.0 to 4.0 mm, in competition to the Panasonic SP-Caps using PPy at that time. Around the turn of the millennium hybrid polymer capacitors were developed, which have in addition to the solid polymer electrolyte a liquid electrolyte connecting the polymer ...
End caps are often built into the shelving or racks of the retail aisle system. Other retailers have an open space at the end of the aisle; an end cap is placed in that space, often on a pallet. Several design options are available. [3] Some endcaps are refrigerated. [4]
In chromatography, endcapping refers to the replacement of accessible silanol groups in a bonded stationary phase by trimethylsilyl groups. End-capped columns have much lower residual silanol group activity compared to non-endcapped columns. [1]
A step-growth copolymer -(-A-A-B-B-) n - formed by the condensation of two bifunctional monomers A–A and B–B is in principle a perfectly alternating copolymer of these two monomers, but is usually considered as a homopolymer of the dimeric repeat unit A-A-B-B. [6] An example is nylon 66 with repeat unit -OC-( CH 2) 4-CO-NH-(CH 2) 6-NH ...
A telechelic polymer or oligomer is a prepolymer capable of entering into further polymerization or other reactions through its reactive end-groups. [1] It can be used for example to synthesize block copolymers. By definition, a telechelic polymer is a di-end-functional polymer where both ends possess the same functionality. [2]
For the α end, this ratio gives the number of chains that come from the R group (4th step in Figure 5) to the number of chains that come from the initiator (2nd step in Figure 5). For the ω end, it gives the proportion of dormant polymer chains (those with a thiocarbonylthio at the end) to dead chains. [12]
[42] [43] For example, the chain-growth copolymer of vinyl chloride and vinyl acetate is random. [39] Block copolymers have long sequences of different monomer units. [39] [40] Polymers with two or three blocks of two distinct chemical species (e.g., A and B) are called diblock copolymers and triblock copolymers, respectively. Polymers with ...
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