Inter-chain barrier

On the other hand, the rope of SWCNTs gave an increase of resistivity with increasing temperature which suggests the existence of metallic CNTs [21], This is accounted for by the small effect of inter-chain barrier and the absence of interlayer hopping processes. 

Since treatment of various samples of amylose with yeast isoamylase (see p. 427) caused a significant decrease in specific viscosity and a corresponding increase in / -amylolysis limit, it seems probable that some amylose molecules have a low degree of branching, and that the inter-chain linkages are of the a-D-(l—>6)-glucosidic type, as in amylopectin. However, all samples of amylose do not contain barriers to 3-amylolysis, as shown by the isolation of amylose of molecular weight 2 X 10 and /3-amylolysis limit 95% by dispersion of starch in dimethyl sulfoxide. ... 

The barrier properties of polymeric materials are determined by the chemical structure of the chain and the system morphology. The parameters derived from chemical structure, such as degree of polarity, inter-chain forces, ability to crystallize, and chain stiffness, are essentially determined upon the selection of the particular polymer. Here, we will focus on how molecular order influences the barrier properties of polymers, including molecular orientation and degree of crystallinity however, it must be recognized that the range in which these quantitites can be manipulated will depend on chemical structure. 

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