We introduce a theoretical model based upon the kinetic Monte Carlo (KMC) simulation approach capable of quantifying chain shuttling copolymerization (CSP) of ethylene and 1-octene in a semibatch operation. To make a deeper understanding of kinetics and evolution of microstructure, the reversible transfer reaction is first investigated by applying each of the individual catalysts to the reaction media, and the competences and shortcomings of a qualified set of CSP catalysts are discussed based on coordinative chain transfer copolymerization (CCTP) requirements. A detailed simulation study is also provided, which reflects and compares the contributions of chain transfer reversibility and other chain breaking reactions in controlling distribution fashion of molecular weight and chemical composition. The developed computer code is executed to capture developments in dead chain concentration and time-driven composition drift during CCTP. Also, the effect of chain shuttling agent (CSA) on the copolymerization kinetics is theoretically studied by simultaneous activation of both catalysts. In this way, it is attempted to make control over comonomer incorporation in the course of copolymerization. The molecular-level criteria reflecting copolymer properties, i.e., ethylene sequence length distribution and longest ethylene sequence length, as the signature of CSA performance, are virtually simulated in the presence and absence of hydrogen to capture an image on gradient copolymers in CCTP and blocks with gradually changing composition in CSP.
For the preparation of thermoresponsive copolymers, for e.g., tissue engineering scaffolds or drug carriers, a precise control of the synthesis parameters to set the lower critical solution temperature (LCST) is required. However, the correlations between molecular parameters and LCST are partially unknown and, furthermore, LCST is defined as an exact temperature, which oversimplifies the real situation. Here, random N-isopropylacrylamide (NIPAM)/dopamine methacrylamide (DMA) copolymers were prepared under a systematical variation of molecular weight and comonomer amount and their LCST in water studied by calorimetry, turbidimetry, and rheology. Structural information was deduced from observed transitions clarifying the contributions of molecular weight, comonomer content, end-group effect or polymerization degree on LCST, which were then statistically modeled. This proved that the LCST can be predicted through molecular structure and conditions of the solutions. While the hydrophobic DMA lowers the LCST especially the onset, polymerization degree has an important but smaller influence over all the whole LCST range.
Purpose The purpose of this study is to enhance the understanding of the role of contracts in channel relationships. Treating contracts as a multidimensional construct, this study examines the effects of contractual issue inclusiveness and contractual obligatoriness on performance and opportunism, as well as the moderating effects of relational norms on the above relationships. Design/methodology/approach Based on the data of 206 samples collected from distributors of house furnishing, computer and computer components, moderated regression is used to test the hypotheses. Findings The empirical test generally supports the conceptual model and provides three findings. First, contractual issue inclusiveness is more profound in enhancing relationship performance than contractual obligatoriness, and contractual obligatoriness is more statistically powerful in mitigating opportunism than contractual issue inclusiveness. Second, relational norms can enhance the positive effect of contractual issue inclusiveness but not contractual obligatoriness on performance. Third, relational norms can strengthen the negative effect of contractual obligatoriness but not contractual issue inclusiveness on opportunism. Research limitations/implications First, this study investigates only contractual issue inclusiveness and contractual obligatoriness, and future studies should consider other dimensions of contracts. Second, the influence of external environment is not considered in the model. Third, data from Chinese distributors limit the generalization of conclusions. Finally, data come only from buyers, and suppliers’ viewpoints are not included. Practical implications The results provide a framework for managers to use contracts and relational norms. Managers should pay attention to the alignment between contractual dimensions and firm objectives because various dimensions of contracts have different impacts on channel relationships. Originality/value Prior research has documented contracts’ role in coordinating channel relationships but has not achieved consistent conclusions on contracts’ effectiveness. Furthermore, extant research indicates that channel members will use contracts and relational norms simultaneously but has conflicting views on the combined effects of these two control mechanisms. The study contributes by addressing these issues.
Purpose The purpose of this study is to reconcile the positive, non-significant and even negative effects of guanxi on firm performance from two aspects. First, it explores the linear and curvilinear relationships between guanxi and distinct performance dimensions. Second, it examines the moderating effects of both exchange-related behavioral risk (reflected by contract enforcement in this study) and market-related environmental risk (reflected by market turbulence in this study) on the above relationship. Design/methodology/approach Based on data for 206 samples collected from distributors of house furnishings, computers and their components, a moderated regression is used to test the hypotheses. Findings The empirical test generally supports the conceptual model and demonstrates three findings. First, guanxi has a linear, positive effect on financial performance and an inverted U-shaped effect on strategic performance. Second, contract enforcement decreases the effect of guanxi on financial performance and enhances its effect on strategic performance. Third, market turbulence enhances the effect of guanxi on financial performance and weakens its effect on strategic performance. Research limitations/implications First, this study collects data only from China. Future studies should collect data from other emerging markets to allow for either model validation or cross-country comparisons. Second, the data come only from buyers, and suppliers’ viewpoints are not included. Third, in addition to contract enforcement and market turbulence, other important contingencies should be considered in the guanxi–performance link. Practical implications The results provide important implications for managers to manage guanxi in an emerging economy. Managers should be very clear about their primary goal (i.e. pursuing short-term financial revenue or long-term strategic targets); next, they should understand how to match guanxi with various levels of contract enforcement and market turbulence to achieve that goal. Originality/value First, prior research has documented guanxi’s role in channel relationships, but it has not achieved consistent conclusions. Second, although existing studies have analyzed the contingencies of guanxi at the firm level, market level and institutional level, another important contingency “the dyadic relationship condition” is rarely considered. Third, although the extant research has realized the value of guanxi contingent on various market conditions, conflicting views exist. This study contributes by addressing these issues.
PurposeSocial media has emerged as a new marketing channel and an important source for customer inspiration. Understanding the sources and consequences of customer inspiration via social media is important for both researchers and marketers. However, little has been done to empirically examine customer inspiration in the social media context. Specifically, the process through which customers become inspired and motivated by social media to purchase the advertised products remains elusive. Therefore, this study extends the conceptualisation of customer inspiration into the social media context, and explores the antecedents of customer inspiration from three perspectives: informational, social and personal. This study also examines the impact of customer inspiration on customers' behavioral intention.Design/methodology/approachSurvey methodology was used and data from 679 respondents were collected in China. To examine the hypothesized relationships, partial least squares (PLS) was used to analyse the data and Smart PLS 3.0 was used for data analysis.FindingsThe study findings demonstrated that the vividness of ads, social influence and promotion focus had positive impacts on the “inspired-by state”, and subsequently the “inspired-to state”, which in turn positively influenced customers' purchasing intentions. However, media richness has a negative impact on the “inspired-by state”.Originality/valueThis study provides the first evidence of customer inspiration via social media and examines its antecedents and consequences. Practically, this study offers useful guidelines and suggestions for firms on how to inspire customers using social media.
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