The formation of [beta]-crystals in copolymers and terpolymers of iPP with ethylene and 1-butene, achieved by the addition of a [beta]-nucleating agent, was found to be highly dependent on comonomer
type and crystallization conditions.
In our development efforts we have concentrated on ethylidene norbornene (ENB) as the diene of choice for EPDM, but 1,4-hexadiene, dicyclopentadiene and other comonomers
can be used.
In particular, the aim of this work was to investigate the effects that MWD and short-chain branch (SCB) length have on the observed melt fracture phenomena for LLDPE/a-olefin resins with similar weight comonomer
content and molecular weight.
By these equations, the crystallization and comonomer
content of three HDPE samples were shown in Table 2.
That indicates that there is either a small fraction of comonomer
in Notio SN or that the comonomer
can also be polymerized syndiotactically like butene-1," says Kenneth Sinclair, a consultant at polymer research group EnerChemTek Inc.
These figures describe differential [alpha]-olefin comonomer
efficiency (octene > butene > propylene) for adjusting interfacial tension, with a similar trend in low temperature performance at comparable crystallinity.
The authors further observed that an ethylene comonomer
on a vinyl acetate backbone exerted the same level of hydrolytic resistance on a weight basis as VeoVa.
Furthermore, combining two reactors makes it possible to steer the MMD separately in the higher and lower MM ranges--to incorporate more branches in the longer polymer chains (inverse comonomer
4] Factors Level 1 Level 2 Level 3 1 Comonomer
BA BMA St 2 Ratio of comonomers
and cis-AEOEA 0/1 2/1 4/1 3 Polymerization temperature ([degree]C) 60 70 80 4 Initiator dosage (%) 1 2 3 The electron-donating ability of comonomers
is in increasing order
The dispersion comprises a water miscible organic solvent and a polyureaurethane with a THF copolymer soft segment featuring 25%-60% by weight of ethylene glycol as a comonomer
and an aromatic diisocyanate.
The polymers will be referred to using the abbreviation for the macromer, with the weight percent and type of comonomer
added following, if used.
In the present study methyl methacrylate is copolymerized with a biocompatible comonomer
, 2-hydroxy ethyl methacrylate and the resultant microspheres were phosphorylated in order to achieve the ability to nucleate calcium phosphate crystals.