TY  - JOUR
A1  - Izraylit, Victor
A1  - Gould, Oliver E. C.
A1  - Kratz, Karl
A1  - Lendlein, Andreas
T1  - Investigating the phase-morphology of PLLA-PCL multiblock copolymer/PDLA blends cross-linked using stereocomplexation
JF  - MRS advances
N2  - The macroscale function of multicomponent polymeric materials is dependent on their phase-morphology. Here, we investigate the morphological structure of a multiblock copolymer consisting of poly(L-lactide) and poly(epsilon-caprolactone) segments (PLLA-PCL), physically cross-linked by stereocomplexation with a low molecular weight poly(D-lactide) oligomer (PDLA). The effects of blend composition and PLLA-PCL molecular structure on the morphology are elucidated by AFM, TEM and SAXS. We identify the formation of a lattice pattern, composed of PLA domains within a PCL matrix, with an average domain spacing d0 = 12 - 19 nm. The size of the PLA domains were found to be proportional to the block length of the PCL segment of the copolymer and inversely proportional to the PDLA content of the blend. Changing the PLLA-PCL / PDLA ratio caused a shift in the melt transition Tm attributed to the PLA stereocomplex crystallites, indicating partial amorphous phase dilution of the PLA and PCL components within the semicrystalline material. By elucidating the phase structure and thermal character of multifunctional PLLA-PCL / PDLA blends, we illustrate how composition affects the internal structure and thermal properties of multicomponent polymeric materials. This study should facilitate the more effective incorporation of a variety of polymeric structural units capable of stimuli responsive phase transitions, where an understanding the phase-morphology of each component will enable the production of multifunctional soft-actuators with enhanced performance.
KW  - polymer
KW  - blend
KW  - nanostructure
KW  - morphology
Y1  - 2020
U6  - https://doi.org/10.1557/adv.2019.465
SN  - 2059-8521
VL  - 5
IS  - 14-15
SP  - 699
EP  - 707
PB  - Cambridge Univ. Press
CY  - New York
ER  - 
TY  - JOUR
A1  - Farhy, Yael
T1  - Morphological generalization of Hebrew verb classes
BT  - an elicited production study in native and non-native speakers
JF  - The mental lexicon
N2  - The present work investigated how morphological generalization, namely the way speakers extend their knowledge to novel complex words, is influenced by sources of variability in language and speaker properties. For this purpose, the study focused on a Semitic language (Hebrew), characterized by unique non-concatenative morphology, and native ( L1) as well as non-native (L2) speakers. Two elicited production tasks tested what information sources speakers employ in verbal inflectional class generalization, i.e., in forming complex novel verbs. Phonological similarity was tested in Experiment 1 and argument structure in Experiment 2. The analysis focused on the two most common Hebrew inflectional classes, Paal and Piel, which also constituted the vast majority of responses in the two tasks. Unlike the commonly found outcomes in Romance inflectional class generalization, the results yielded, solely for Piel, a graded phonological similarity effect and a robust argument structure effect, i.e., more Piel responses in a direct object context than without. The L2 pattern partially differed from the L1: (i) argument structure effect for L2 speakers was weaker, and (ii) L2 speakers produced more Paal than Piel responses. The results are discussed within the framework of rule-based and input-based accounts.
KW  - morphology
KW  - generalization
KW  - inflectional classes
KW  - Hebrew
KW  - non-native
KW  - speakers
Y1  - 2020
U6  - https://doi.org/10.1075/ml.19001.far
SN  - 1871-1340
SN  - 1871-1375
VL  - 15
IS  - 2
SP  - 223
EP  - 257
PB  - John Benjamins Publishing Co.
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Clahsen, Harald
A1  - Jessen, Anna
T1  - Variability and its limits in bilingual word recognition
BT  - a morphological priming study
JF  - The mental lexicon
N2  - This study examines the processing of morphologically complex words focusing on how morphological (in addition to orthographic and semantic) factors affect bilingual word recognition. We report findings from a large experimental study with groups of bilingual (Turkish/German) speakers using the visual masked-priming technique. We found morphologically mediated effects on the response speed and the inter-individual variability within the bilingual participant group. We conclude that the grammar (qua morphological parsing) not only enhances speed of processing in bilingual language processing but also yields more uniform performance and thereby constrains variability within a group of otherwise heterogeneous individuals.
KW  - German
KW  - inflection
KW  - morphology
KW  - L2 processing
KW  - masked priming
Y1  - 2020
U6  - https://doi.org/10.1075/ml.20013.cla
SN  - 1871-1340
SN  - 1871-1375
VL  - 15
IS  - 2
SP  - 295
EP  - 329
PB  - John Benjamins Publishing Co.
CY  - Amsterdam
ER  -