Polymer Crystallization最新文献_第3页

Aliphatic polyamides (nylons): Interplay between hydrogen bonds and crystalline structures, polymorphic transitions and crystallization 脂肪族聚酰胺(尼龙):氢键与晶体结构、多态转变和结晶之间的相互作用

IF 1.9

Polymer Crystallization Pub Date : 2021-06-30 DOI: 10.1002/pcr2.10199

J. Puiggalí

引用次数: 9

Modulus enhancement of polypropylene by sorbitol nucleating agent in flow field 山梨醇成核剂对流场聚丙烯模量的增强作用

IF 1.9

Polymer Crystallization Pub Date : 2021-04-01 DOI: 10.1002/pcr2.10170

Shohei Iwasaki, Mitsuko Inoue, Yurie Takei, R. Nishikawa, M. Yamaguchi

引用次数: 9

Cross hatched structure of polyethylene spherulites 聚乙烯球粒的交叉孵化结构

IF 1.9

Polymer Crystallization Pub Date : 2021-03-07 DOI: 10.1002/PCR2.10174

S. Yakovlev, K. Downing, P. Brant

引用次数: 2

Secondary nucleation in polymer crystallization: A kinetic view 聚合物结晶中的二次成核:动力学观点

IF 1.9

Polymer Crystallization Pub Date : 2021-02-06 DOI: 10.1002/PCR2.10173

Shujing Zhang, Zhiqi Wang, Baohua Guo, Jun Xu

{"title":"Secondary nucleation in polymer crystallization: A kinetic view","authors":"Shujing Zhang, Zhiqi Wang, Baohua Guo, Jun Xu","doi":"10.1002/PCR2.10173","DOIUrl":"https://doi.org/10.1002/PCR2.10173","url":null,"abstract":"Funding information National Natural Science Foundation of China, Grant/Award Numbers: 21873054, 21861132018, U1862205; National Science and Technology Major Project, Grant/Award Number: 2017YFB0309301; Tsinghua University Scientific Research Project, Grant/ Award Number: 20194180048 Abstract Secondary nucleation on the surfaces of growing crystals plays a vital role in polymer crystallization, which determines the lamellar thickness at growth front and the radial growth rate. Though secondary nucleation has been intensively studied in the past decades, our understanding on the molecular mechanism and kinetics is not yet complete. In this perspective, we will briefly review the major advances in the secondary nucleation of flexible polymer chains in the past decade and discuss some remained questions from a viewpoint of kinetics. The main theories, thermodynamics and kinetics of secondary nucleation are first summarized. The difference of nucleation of polymer chains from that of small molecular crystals is revealed via analysis of kinetics. Then, the interplay of various microscopic processes leading to the final crystalline structures is discussed, such as lamellar thickening versus widening, intra-chain vs inter-chain nucleation, secondary nucleation versus lateral spreading, secondary vs primary nucleation, nucleation of polymorphisms, and so forth. Finally, some remained open questions are highlighted. Combining kinetic theory considering various microscopic processes and new experimental evidences at different length and time scales would greatly help deepen our understanding on the secondary nucleation during crystallization of flexible polymer chains.","PeriodicalId":36413,"journal":{"name":"Polymer Crystallization","volume":"3 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2021-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/PCR2.10173","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41249221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Crystallization behavior of poly(lactic acid) and its blends 聚乳酸及其共混物的结晶行为

IF 1.9

Polymer Crystallization Pub Date : 2020-12-31 DOI: 10.1002/pcr2.10171

Yaming Wang, Chuntai Liu, Changyu Shen

引用次数: 8

Transcrystallinity in maize tissues/polypropylene composites: First focus of the heterogeneous nucleation and growth stages versus tissue type 玉米组织/聚丙烯复合材料的跨结晶性：非均匀成核和生长阶段与组织类型的第一焦点

IF 1.9

Polymer Crystallization Pub Date : 2020-10-02 DOI: 10.1002/PCR2.10155

S. Boyer, J. Haudin, Vivian Song, Vincent Bourassier, P. Navard, C. Barron

{"title":"Transcrystallinity in maize tissues/polypropylene composites: First focus of the heterogeneous nucleation and growth stages versus tissue type","authors":"S. Boyer, J. Haudin, Vivian Song, Vincent Bourassier, P. Navard, C. Barron","doi":"10.1002/PCR2.10155","DOIUrl":"https://doi.org/10.1002/PCR2.10155","url":null,"abstract":"The improvement of cellulosic biomass-polymer composites needs to evaluate what occurs at the biomass-matrix interface during crystallization. Different well-defined maize tissues were obtained by original dry fractionation processes, without chemical treatment. Their morphological features were identified by optical and scanning electron microscopies. For each type of tissue, a small fragment was sandwiched between two films of isotactic polypropylene. The composite was subjected to quiescent isothermal conditions, followed in-situ by polarized optical microscopy. Focus of the heterogeneous nucleation at the surface of maize tissues showed that in all cases, more or less numerous semi-crystalline entities originated from the tissue surface, indicating a moderate nucleating activity. Different crystallization behaviors were observed as a function of the tissue. Growth rates of surface layers were generally higher that the growth rates of bulk spherulites. The differences were small, but significant. They were discussed within the frame of kinetic theory of growth.","PeriodicalId":36413,"journal":{"name":"Polymer Crystallization","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2020-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/PCR2.10155","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44355073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self‐organization of micro reinforcements and the rules of crystal formation in polypropylene nucleated by non‐selective nucleating agents with dual nucleating ability 具有双重成核能力的非选择性成核剂成核聚丙烯中微增强体的自组织和晶体形成规律

IF 1.9

Polymer Crystallization Pub Date : 2020-07-21 DOI: 10.1002/pcr2.10136

A. Menyhárd, J. Molnár, Zsuzsanna Horváth, F. Horváth, D. Cavallo, P. Polyák

{"title":"Self‐organization of micro reinforcements and the rules of crystal formation in polypropylene nucleated by non‐selective nucleating agents with dual nucleating ability","authors":"A. Menyhárd, J. Molnár, Zsuzsanna Horváth, F. Horváth, D. Cavallo, P. Polyák","doi":"10.1002/pcr2.10136","DOIUrl":"https://doi.org/10.1002/pcr2.10136","url":null,"abstract":"This work demonstrates and models the self-organization of mixed polymorps in polymers containing simultaneously growing phases with different growth rates. The model was verified and demonstrated in isotactic polypropylene nucleated by a non-selective nucleating agent. The crystallization and melting processes were studied by calorimetry (DSC) and polarized light microscopy (PLM). The morphology of the samples was investigated using PLM and scanning electron microscopy (SEM). The funda-mental rules of the formation of two polymorphic modifications developing simultaneously on the same nucleating particle are introduced. A simple equation is suggested to predict the morphological geometry on the lateral surface of the nucleating agent. The results indicated good agreement between the predicted and observed geometry. The proposed model explains the self-organization of micro-sized reinforcements of α -modification in the matrix of β -iPP. Although the proposed equation was tested for this particular case it is a general equation for all structures in which different polymorphs are growing simultaneously with different growth rates.","PeriodicalId":36413,"journal":{"name":"Polymer Crystallization","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/pcr2.10136","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48943710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Zinc pimelate as an effective β‐nucleating agent for isotactic polypropylene at elevated pressures and under rapid cooling rates 在高压和快速冷却条件下，苯甲酸锌作为一种有效的等规聚丙烯成核剂

IF 1.9

Polymer Crystallization Pub Date : 2020-06-01 DOI: 10.1002/pcr2.10132

W. Qin, Kehua Liu, Z. Xin, H. Ling, Shuai Zhou, Shicheng Zhao

引用次数: 9

Polymorphism 多态性

IF 1.9

Polymer Crystallization Pub Date : 2020-04-01 DOI: 10.1002/pcr2.10126

Shichun Jiang, Pengju Pan

引用次数: 0

Microfluidic shear‐induced conformational transition and crystallization of P3HT in toluene 微流控剪切诱导P3HT在甲苯中的构象转变和结晶

IF 1.9

Polymer Crystallization Pub Date : 2020-04-01 DOI: 10.1002/pcr2.10093

Yuanfang Liu, Shanpei Hu, Fengquan Liu, Nan Wei, Jianjun Zhou, Lin Li, H. Huo

引用次数: 1