A General Model for the Ideal Chain Length Distributions of Polymers Made with Reversible Deactivation

Polymer molecular weight, or chain length distributions, are a core characteristic of a polymer system, with the distribution being intimately tied to the properties and performance of the polymer material....

BUSINESS PROCESS THROUGH THE BUILDING LIFECYCLE USING BIM

BIM (building information modeling) describes a method to integrate and connect all relevant, building related data into a virtual data model over the whole lifecycle. The superior goal of all BIM-related research projects at the Chair of Construction Management and Economics is therefore to advance the efforts of data model standardization and the corresponding flow of information between all participants involved in a building project. To identify all relevant data, the focus of each project is hence directed to the question who needs which information from whom, how, when and what for. In this context the research project “Development of an ideal chain of process for using the BIM-method during the lifecycle of real estate” aims to develop and define a standardized and idealistic virtual chain of process using BIM. Therefore, the actual process structure (without BIM) will to be analyzed and defined in consideration of relevant regulations, interviews of experts etc. In this respect, the performance spectrum of each participant and the communication as well as information interface will be taken into account. Up from this point the process can be enriched with BIM-content to create an ideal BIM-process-chain. It will be important to develop a most general-purpose to include different variations of project organizations and market players. By doing so, it will be possible to transfer the BIM-method to all real estate and civil construction participants.

DEPENDENCE OF THE DAVYDOV'S SOLITON BEHAVIOR IN THE LINEAR POLYMER CHAIN ON THE EXCITON–PHONON COUPLING

The Davydov's soliton propagation in the linear polymer chain is analyzed numerically by solving the discrete equations of motion for exciton and phonon amplitudes. The main difference with respect to the results of continual approximation is that two exciton–phonon coupling constants influence separately the soliton behavior. Their influence is studied both in the ideal chain and the chain with single impurity.

FORCES BY AND ON A POLYMER GRAFTED TO A REPULSIVE WALL

We investigate a self-avoiding polymer chain anchored with one end at a hard wall. The chains are modeled using the continuous backbone mass model. The sampling of the conformations is done by molecular dynamics for chains of various sizes. Presented are results for several different interesting situations. We have investigated the pressure that grafted chains of various sizes exert on the wall and find good agreement with the theory, if the theory is extended to the self-avoiding case using the standard scaling laws. Force-elongation simulations are compared to polymer theory and the partition function for a grafted ideal chain is explicitly calculated. Again we find good agreement with the theory.